C Program to remove all characters except string

Q) Write a C program to remove the characters in String except alphabets.

Sol)
 
#include<stdio.h>

int main()
{
  char line[150];
  int i,j;  

  printf("Enter a string:") ;
  gets(line);

  for(i=0; line[i]!='\0' ; ++i)
   {
      while(!((line[i]>='a' && line[i]<='z') || (line[i]>='A' && line[i]<='Z' || line[i] == '\0')))
           {
                for(j=i; line[j]!='\0';++j)
                        {
                                  line[j] = line[j+1];
                         }
                line[j]='\0' ;
            }
   }
  printf("Output String is :  ")
  puts(line);
  return 0;
}


                                  :: OUTPUT ::  

Enter a string: G-="o";][d 
Output String is: God

STAR PATTERN2

Write a program to print the following star pattern

*****
****
***
**
*

#include<iostream.h>
#include<conio.h>
void main()
{
 clrscr();
 int i,j,n;
 cout<<"Enter number of rows"<<endl;
 cin>>n;
 for(i=n;i>=1;i--)
  {
   for(j=1;j<=i;j++)
    {
     cout<<"*";
    }
   cout<<endl;
 }
 getch();
}

==OUTPUT==

MULTIPLICATION OF TWO MATRICES

Write a program for multiplication  of two matrices
                        OR
Write a program to multiply two matrices

#include<iostream.h>
#include<conio.h>
void main()
{  
 clrscr();
 int a[10][10],b[10][10],c[10][10];
 int i, j, n, m;
 int p,q,k,x[10];
 cout<<"enter no of rows of 1st matrix\n";
 cin>>m;
 cout<<"enter no of colomns of 1st matrix\n";
 cin>>n;
  cout<<"enter no of rows of 2nd matrix\n";
 cin>>p;
 cout<<"enter no of colomn 2nd matrix\n";
 cin>>q;
 if(n==p)
 {
  cout<<"\n\nenter the elements of 1st matrix\n";
  for(i=0;i<m;i++)
   {
    for(j=0;j<n;j++)
     {
      cout<<"a["<<i+1<<"]["<<j+1<<"]:= ";
      cin>>a[i][j];
     }
   }
  cout<<"\n\nfirst matrix u have entered is:="<<endl;
  for(i=0;i<m;i++)
   {
    for(j=0;j<n;j++)
     {
      cout<<"\t"<<a[i][j];
     }
    cout<<endl;
   }
 cout<<"\n\nenter the elements of 2nd matrix\n";
 for(i=0;i<p;i++)
  {
   for(j=0;j<q;j++)
    {
     cout<<"b["<<i+1<<"]["<<j+1<<"]:= ";
     cin>>b[i][j];
    }

  }
 cout<<"\n\n2nd matrix u have entered is:="<<endl;
 for(i=0;i<p;i++)
  {
   for(j=0;j<q;j++)
    {
     cout<<"\t"<<b[i][j];
    }
    cout<<endl;
 }
 for(i=0;i<m;i++)
  {
   for(j=0;j<q;j++)
   {
   c[i][j]=0;
    {
     for(k=0;k<n;k++)
      {  
        x[k]=0;
        x[k]=a[i][k]*b[k][j];
        c[i][j]=c[i][j]+x[k];
      }
    }}
   }
  cout<<"\n\nmultiplication of two matrices is:="<<endl;
  for(i=0;i<m;i++)
   {
    for(j=0;j<q;j++)
     {
      cout<<"\t"<<c[i][j];
     }
    cout<<endl;
   }
  }
   else
    {
     cout<<"matrices cannot be multiplied";
     }

getch();
}

==OUTPUT==


enter no of rows of 1st matrix
2
enter no of column of 1st matrix
2
enter no of rows of 1st matrix
2
enter no of column of 1st matrix
2

enter the elements of 1st matrix
a[1]=1
a[2]=2
a[3]=2
a[4]=3

first matrix u have entered is:=
1 2
2 3

enter the elements of 2nd matrix
b[1]=2
b[2]=3
b[3]=2
b[4]=1

2nd matrix u have entered is
2 3
2 1

multiplication of two matrices is
6 5
8 9

PROGRAM TO PRINT SPIRAL MATRIX

Q) Write a program to print spiral matrix .

Sol)

#include<stdio.h>

#include<conio.h>

void main()

{

      int m[20][20],i,j;

      int lc,hc,lr,hr,r,c,cnt ;

      clrscr();

     printf("www.c-programcodes.co.in");
     printf("\n Enter r & c ::") ;

     scanf("%d%d" ,&r, &c) ;;

    

     cnt=1;

     lr=0, lc =0 ;

     hr= r-1;

     hc = c-1;

    while(lr<=hr && lc <= hc )

        {

            i = lr;

            for(j=lc;j<= hc ; j++)

                 {

                         m[i][j] = cnt++ ;

                         j= hc;

         

                         for(i=lr+1;i<=hr)

                             {

                                 m[i][j]= cnt++;

                                 if( lr != hr)

                                      {

                                         i =hr;

              

                                         for(j=hc-1;j>=lc;j--)

                                               m[i][j] = cnt++ ;

                                     }

                                 if(lc != hc)

                                     {

                                         j =hc;

                                         for(i=hr-1;i>lr;i--)

                                                m[i][j] = cnt++ ;

                                     }

                          }

                }

        lr++;

        lc++;

        hr--;

        hc--;

       }

     printf("\n Spirally filled matrix is \n");

     for(i=0;i<r ;  i++)

     {

         for(j=0;j<c;j++)

           {

                   printf("%4d", m[i][j]) ;

                   printf("\n") ;

            }

      }

}

OPEN a FILE

Q) Write a C program to open a file


Sol)

#include<stdio.h>
#include<stdlib.h>

int main()
{

   ch, file_name[24];
   FILE *fp;

    printf("c-programcodes.blogspot.in");
    printf("Enter the name of file you wish to see\n");
    get(file_name,"r");      //read mode

    if(fp==NULL)
       {
              perror("Error while opening the file \n") ;
              exit(EXIT_FAILURE) ;
       } 
    
    printf("The contents of %s file are: \n", file_name);

    while((ch=fgetc(fp)) != EOF)
             printf("%c",ch) ;
  
    fclose(fp);
    return 0;

}

PROGRAM TO MAKE A FISH

Q) Write a program to make a FISH.

Sol)

 #include<conio.h>
 #include<stdio.h>
#include<graphics.h>

Void main ()
 {

       int gd=DETECT, gm ; 
       initgraph (&gd,&gm, "     "); 

       ellipse (200, 200, 0, 360, 50, 30);  
       line(250, 200, 280, 170);
       line(280, 170, 280, 170);
       line(280, 230, 250, 200);
       circle(160, 190, 3); 

       getch (); 
       closegraph();

 }

PROGRAM TO CONVERT CHARACTERS FROM LOWERCASE TO UPPERCASE AND FROM UPPERCASE TO LOWERCASE IN GIVEN STRING IN C++

Write a program to convert all characters from lowercase to uppercase and all upper case characters to lowercase in given string


#include<iostream.h>
#include<conio.h>
void main()
{
 clrscr();
 int m,t=0,i;
 char a[100];
 cout<<"Enter the string\n";
 cin.getline(a,100);
 for(i=0;a[i]!='\0';i++)  //to count total number of words include space
 {
  t++;
 }
 cout<<"\nString after conversion\n";
 for(i=0;i<t;i++)
 {
  m=0;
  m=a[i];
  if(m>=65&&m<=90)
  {
   m=m+32;
   cout<<char(m);
  }
  else
   if(m>=97&&m<=122)
   {
    m=m-32;
    cout<<char(m);
   }
   else
    {
     cout<<char(m);
    }
  }
 getch();
}

==OUTPUT==

PROGRAM TO PRINT UPPER TRIANGULAR MATRIX IN C++

Write a program to print upper triangular matrix in c++

#include<iostream.h>
#include<conio.h>
void main()
{   clrscr();
 int a[10][10],b[10][10],c[10][10];
 int i, j, n, m;
 int p,q;
 cout<<"enter no of rows of matrix\n";
 cin>>m;
 cout<<"enter no of colomns of matrix\n";
 cin>>n;
 cout<<"\n\nenter the elements of matrix\n";
  for(i=0;i<m;i++)
   {
    for(j=0;j<n;j++)
     {
      cout<<"a["<<i+1<<"]["<<j+1<<"]:= ";
      cin>>a[i][j];
     }
   }
  cout<<"\n\nmatrix u have entered is"<<endl;
  for(i=0;i<m;i++)
   {
    for(j=0;j<n;j++)
     {
      cout<<"\t"<<a[i][j];
     }
    cout<<endl;
   }
 cout<<"Upper tringular matrix is"<<endl;
  for(i=0;i<m;i++)
  {
   for(j=0;j<n;j++)
    {
     if(i<=j)
     {
      cout<<"\t"<<a[i][j];
     }
     else
     {
      cout<<"\t ";
     }
    }
    cout<<endl;
  }


getch();
}

==OUTPUT==

PROGRAM TO COUNT TOTAL NUMBER OF POSITIVE AND NEGATIVE ELEMENTS IN A MATRIX AND PRINT THEM IN C++

#include<iostream.h>
#include<conio.h>
void main()
{   clrscr();
 int a[10][10];
 int i, j, n, m;
 int x[100],y[100],pos=0,neg=0;
 cout<<"enter no of rows\n";
 cin>>n;
 cout<<"enter no of colomn\n";
 cin>>m;
 cout<<"enter the values of matrix\n";
 for(i=0;i<n;i++)
  {
   for(j=0;j<m;j++)
    {
     cout<<"a["<<i+1<<"]["<<j+1<<"]:= ";
     cin>>a[i][j];
    }

  }
 cout<<"matrix u have entered is"<<endl;
 for(i=0;i<n;i++)
  {
   for(j=0;j<m;j++)
    {
     cout<<"\t"<<a[i][j];
    }
    cout<<endl;
  }
  for(i=0;i<n;i++)
  {
   for(j=0;j<m;j++)
    {
     if(a[i][j]>=0)
      {
       x[pos]=a[i][j];
       pos++;
      }
     else
       {
        y[neg]=a[i][j];
        neg++;
       }
    }
  }
  cout<<"total positive elements are= "<<pos<<endl;
  cout<<"positive elements are"<<endl;
  for(i=0;i<pos;i++)
   {
    cout<<x[i]<<endl;
   }
  cout<<"total neg elements are= "<<neg<<endl;
  cout<<"neg elements are"<<endl;
  for(i=0;i<neg;i++)
   {
    cout<<y[i]<<endl;
   }
getch();
}
==OUTPUT==

TO PRINT TRANSPOSE OF A MATRIX IN C++

Write a program to print transpose of a matrix in c++

#include<iostream.h>
#include<conio.h>
void main()
{
 clrscr();
 int a[10][10];
 int i, j, n, m;
 int x[100],y[100];
 cout<<"enter no of rows\n";
 cin>>n;
 cout<<"enter no of colomn\n";
 cin>>m;
 cout<<"enter the elements of matrix\n";
 for(i=0;i<n;i++)
  {
   for(j=0;j<m;j++)
    {
     cout<<"a["<<i+1<<"]["<<j+1<<"]:= ";
     cin>>a[i][j];
    }

  }
 cout<<"matrix u have entered is"<<endl;
 for(i=0;i<n;i++)
  {
   for(j=0;j<m;j++)
    {
     cout<<"\t"<<a[i][j];
    }
    cout<<endl;
  }
  cout<<"\n\ntranspose of matrix is:="<<endl;
  for(j=0;j<m;j++)
  {
   for(i=0;i<n;i++)
    {
     cout<<"\t"<<a[i][j];
    }
    cout<<endl;
  }
getch();
}

==OUTPUT==

COUNT TOTAL NUMBER OF EVEN AND ODD NUMBERS IN A MATRIX AND PRINT THEM IN C++

Write a program to count total number of even and odd elements in a matrix and print that elements

#include<iostream.h>
#include<conio.h>
void main()
{   clrscr();
 int a[10][10];
 int i, j, n, m;
 int x[100],y[100],even=0,odd=0;
 cout<<"enter no of rows\n";
 cin>>n;
 cout<<"enter no of colomn\n";
 cin>>m;
 cout<<"enter the elements of matrix\n";
 for(i=0;i<n;i++)
  {
   for(j=0;j<m;j++)
    {
     cout<<"a["<<i+1<<"]["<<j+1<<"]:= ";
     cin>>a[i][j];
    }
  }
 cout<<"matrix u have entered is"<<endl;
 for(i=0;i<n;i++)
  {
   for(j=0;j<m;j++)
    {
     cout<<"\t"<<a[i][j];
    }
    cout<<endl;
  }
  for(i=0;i<n;i++)
  {
   for(j=0;j<m;j++)
    {
     if(a[i][j]%2==0 && a[i][j]>=0)
      {
       x[even]=a[i][j];
       even++;
      }
     else
      if(a[i][j]%2!=0 && a[i][j]>=0)
       {
        y[odd]=a[i][j];
        odd++;
       }
    }
  }
  cout<<"total even elements are= "<<even<<endl;
  cout<<"even elements are"<<endl;
  for(i=0;i<even;i++)
   {
    cout<<x[i]<<endl;
   }
  cout<<"total odd elements are= "<<odd<<endl;
  cout<<"odd elements are"<<endl;
  for(i=0;i<odd;i++)
   {
    cout<<y[i]<<endl;
   }
getch();
}

==OUTPUT==

enter no of rows
2
enter no of column
2
enter the elements of matrix
a[1][1]:=1

a[1][2]:=2

a[2[1]:=3

a[2][2]:=4
matrix you have entered is
1  2
3  4
total even elements are=2
even elements are
2
4
total odd elements are=2
odd elements are
1
3

Print Prime Number Pyramid

Q) Write a program to print the PRIME NUMBER PYRAMID.


Sol)

#include<stdio.h>
#include<conio.h>

int prime(int num) ;
void main()
{
     clrscr();
     int i,j ;
     int number=2;
     printf("c-programcodes.blogspot.in")
     for(i=0;i<5;i++)
        {
              printf("\n");
              for(j=0;j<=i;j++)
                 {
                      while(!prime(number)) ;
                         {
                             number++;
                          }
                       printf("%d\t", number++)}
          }
      getch();
}

int prime(int num)
{
        int i, flag ;
        for(i=2;i<num;i++)
           {
                if(num%i!=0)
                      flag=1;
                else
                  {
                       flag=0;
                       break ;
                   }
              }
         if(flag==1 || num==2)
                return(1) ;
         else
                return(0);
 }

                             ===OUTPUT===
c-programcodes.blogspot.in
2

3     5

7     11    13

17   19    23    29

31    37    41    47

STAR PATTERN3

Q)Write a Program to Print The Following Star Pattern in c++
    *
   * *
  * * *
 * * * *
* * * * *

Sol) 
#include<iostream.h>
#include<conio.h>

 void main()
{
    clrscr();
    int i,j,n,k;
    cout<<"Enter number of rows"<<endl;
    cin>>n;
    
    for(i=1;i<=n;i++)
          {
              for(j=n-1;j>=i;j--)
                {
                    cout<<" ";
                 }
             for(k=1;k<=i;k++)
                {
                   cout<<"*";
                }
            cout<<endl;
        }
    getch();
}

                                                    ===OUTPUT===
Enter number of rows
5
    *
   * *
  * * *
 * * * *
* * * * *

STAR PATTERN5

Q) Write a Program to Print The Following Star Pattern in c++

     *

   ***

  *****

 *******

*********

Sol)

#include<iostream.h>
#include<conio.h>
void main()
{
 clrscr();
 int i,j,n,k;
 cout<<"Enter number of rows"<<endl;
 cin>>n;
 for(i=1;i<=n;i++)
 {
  for(j=1;j<=n-i;j++)
  {
   cout<<" ";
  }
   for(k=1;k<=2*i-1;k++)
    {
     cout<<"*";
    }
    cout<<endl;
 }
 getch();
}

                                               ===OUTPUT===

STAR PATTERN1

Q) Write a Program to Print The Following Star Pattern in c++

      *

      **

      ***

      ****

      *****

Sol)

#include<iostream.h>

#include<conio.h>

void main()
{
  clrscr();
  int i,j,n;

   cout<<"Enter number of rows"<<endl;
  cin>>n;
 
  for(i=1;i<=n;i++)
     {
         for(j=1;j<=i;j++)
           {
               cout<<"*";
           }
        cout<<endl;
     }
 getch();
}

                                     ===OUTPUT===

SUBTRACTION OF TWO MATRICES IN C++

Write a program for subtraction of two matrices
                      OR
Write a program to subtract two matrices

#include<iostream.h>
#include<conio.h>
void main()
{  
clrscr();
 int a[10][10],b[10][10],c[10][10];
 int i, j, n, m;
 int p,q;
 cout<<"enter no of rows of 1st matrix\n";
 cin>>m;
 cout<<"enter no of columns of 1st matrix\n";
 cin>>n;
  cout<<"enter no of rows of 2nd matrix\n";
 cin>>p;
 cout<<"enter no of column 2nd matrix\n";
 cin>>q;
 if(m==p && n==q)
 {
  cout<<"\n\nenter the elements of 1st matrix:=\n";
  for(i=0;i<m;i++)
   {
    for(j=0;j<n;j++)
     {
      cout<<"a["<<i+1<<"]["<<j+1<<"]:= ";
      cin>>a[i][j];
     }
   }
  cout<<"\n\n1st matrix u have entered is:="<<endl;
  for(i=0;i<m;i++)
   {
    for(j=0;j<n;j++)
     {
      cout<<"\t"<<a[i][j];
     }
    cout<<endl;
   }
 cout<<"\n\nenter the elements of 2nd matrix:=\n";
 for(i=0;i<p;i++)
  {
   for(j=0;j<q;j++)
    {
     cout<<"b["<<i+1<<"]["<<j+1<<"]:= ";
     cin>>b[i][j];
    }

  }
 cout<<"\n\n2nd matrix u have entered is:="<<endl;
 for(i=0;i<p;i++)
  {
   for(j=0;j<q;j++)
    {
     cout<<"\t"<<a[i][j];
    }
    cout<<endl;
 }
 for(i=0;i<m;i++)
  {
   for(j=0;j<n;j++)
    {
     c[i][j]=a[i][j]-b[i][j];
    }
  }
  cout<<"\n\nsubtraction of two matrices is:="<<endl;
  for(i=0;i<m;i++)
   {
    for(j=0;j<n;j++)
     {
      cout<<"\t"<<c[i][j];
     }
    cout<<endl;
   }
  }
   else
    {
     cout<<"matrices cannot be subtracted";
     }

getch();
}

==OUTPUT==
enter no of rows of  1st matrix
2
enter no of columns of  1st matrix
2
enter no of rows of 2nd matrix
2
enter no of columns of 2nd matrix
2
enter the elements of 1st matrix:=
a[1][1]:=1
a[1][2]:=2
a[2][1]:=3
a[2][2]:=1

1st matrix you have entered is:=
    1    2
    3    1

enter the elements of 2nd matrix:=
b[1][1]:=2
b[1][2]:=5
b[2][1]:=0
b[2][2]:=5

2nd matrix you have entered is:=
    2    5
    0    5

subtraction of two matrices is:=
    -1   -3
     3   -4

ADDITION OF MATRIX IN C++

Write a program for addition of two matrices
                      OR
Write a program to add two matrices

#include<iostream.h>
#include<conio.h>
void main()
{   clrscr();
 int a[10][10],b[10][10],c[10][10];
 int i, j, n, m;
 int p,q;
 cout<<"enter no of rows of 1st matrix\n";
 cin>>m;
 cout<<"enter no of columns of 1st matrix\n";
 cin>>n;
  cout<<"enter no of rows of 2nd matrix\n";
 cin>>p;
 cout<<"enter no of column 2nd matrix\n";
 cin>>q;
 if(m==p && n==q)
 {
  cout<<"\n\nenter the elements of 1st matrix:=\n";
  for(i=0;i<m;i++)
   {
    for(j=0;j<n;j++)
     {
      cout<<"a["<<i+1<<"]["<<j+1<<"]:= ";
      cin>>a[i][j];
     }
   }
  cout<<"\n\n1st matrix u have entered is:="<<endl;
  for(i=0;i<m;i++)
   {
    for(j=0;j<n;j++)
     {
      cout<<"\t"<<a[i][j];
     }
    cout<<endl;
   }
 cout<<"\n\nenter the elements of 2nd matrix:=\n";
 for(i=0;i<p;i++)
  {
   for(j=0;j<q;j++)
    {
     cout<<"b["<<i+1<<"]["<<j+1<<"]:= ";
     cin>>b[i][j];
    }

  }
 cout<<"\n\n2nd matrix u have entered is:="<<endl;
 for(i=0;i<p;i++)
  {
   for(j=0;j<q;j++)
    {
     cout<<"\t"<<a[i][j];
    }
    cout<<endl;
 }
 for(i=0;i<m;i++)
  {
   for(j=0;j<n;j++)
    {
     c[i][j]=a[i][j]+b[i][j];
    }
  }
  cout<<"\n\nsum of two matrices is:="<<endl;
  for(i=0;i<m;i++)
   {
    for(j=0;j<n;j++)
     {
      cout<<"\t"<<c[i][j];
     }
    cout<<endl;
   }
  }
   else
    {
     cout<<"matrices cannot be added";
     }

getch();
}

==OUTPUT==
enter no of rows of  1st matrix
2
enter no of columns of  1st matrix
2
enter no of rows of 2nd matrix
2
enter no of columns of 1st matrix
2
enter the elements of 1st matrix:=
a[1][1]:=1
a[1][2]:=2
a[2][1]:=3
a[2][2]:=1

1st matrix you have entered is:=
    1    2
    3    1

enter the elements of 2nd matrix:=
b[1][1]:=2
b[1][2]:=5
b[2][1]:=0
b[2][2]:=5

2nd matrix you have entered is:=
    2    5
    0    5

sum of two matrices is:=
    3    7
    3    6

STAR PATTERN4

Q.) Write a Program to Print The Following Star Pattern in c++

          *****

          ****

          ***

          **

          *

Sol) 

 #include<iostream.h>

#include<conio.h>

void main()

{

    clrscr();

    int i,j,n;

    cout<<"Enter number of rows"<<endl;

    cin>>n;

    for(i=n;i>=1;i--)

     {

         for(j=1;j<=i;j++)

             {

                  cout<<"*";

             }

        cout<<endl;

     }

   getch();

}

                                              =OUTPUT=

Enter number of rows 5

*****

****

***

**

*

PRINTING A MATRIX IN C++

Q.) Write a C++ Program to input the elements of  a matrix and then print them in matrix form.

Sol)

#include<iostream.h>

#include<conio.h>

void main()

{

   clrscr();

   int a[10][10];

   int i, j, n, m;

  

   cout<<"enter no of rows  \n";

   cin>>n;

   cout<<"enter no of colomn  \n";

   cin>>m;

   cout<<"enter the values of matrix  \n";

  

   for(i=0;i<n;i++)

     {

         for(j=0;j<m;j++)

           {

               cout<<"a["<<i+1<<"]["<<j+1<<"]:= ";

               cin>>a[i][j];

           }

     }

   cout<<"matrix u have entered is \n ";

  

   for(i=0;i<n;i++)

      {

          for(j=0;j<m;j++)

            {

                  cout<<"\t"<<a[i][j];

            }

         cout<<"\n";

     }

  getch();

}

                                        =OUTPUT=

Simple Linked List

Q) A C program of simple Linked List without any user defined function.

SOl)

#include<stdio.h>

#include<conio.h>

#include<stdlib.h>

void main()

{

   struct node

     {

          int data;

          struct node*next;

     };

   typedef struct node node ;

   int d ;

   node *start=NULL, temp, *save ;

   int option ;

     

   printf("Enter the data for the node\n ");

   scanf("%d",&d) ;

   

   start=(node*)malloc(sizeof (node)) ;

   start->data ;

   start->next= NULL ;

   save = start ;

   

   printf("Do you want to enter more data \n" ) ;

   printf("Press 1 for yes otherwise 0 \n ");

   scanf("%d",&option) ;

   while(option==1)

     {

         printf("Enter the data for the node\n ") ;

         scanf("%d", &d) ;

         temp = (node*)malloc(sizeof (node)) ;

         temp->data=d;

         temp->next= NULL ;

         save->next= temp ;

         save=temp;

         printf("Do you want to enter more data \n") ;

         printf("Press 1 for yes otherwise 0 \n ");

         scanf("%d", &option) ;

 

    }

  printf("The Linked List is \n") ;

  

  while(start!= NULL)

      {

           printf("%d->", start->data);

           start = start->next ;

      }

   getch();

}

Convert Binary to Octal Number

Q)Write a C program to convert the BINARY NUMBER to OCTAL NUMBER

Sol)

#include<stdio.h>

int main( )

{

    long int binary_no, octal_no=0, j=1, rem;

   

    printf("Enter any Binary number: " ) ;

    scanf("%ld", &binary_no) ;

    while(binary_no!=0)

       {

              rem=binary_no%10 ;

              octal_no=octal_no+rem*j ;

              j=j*2;

              binary_no=binary_no/10 ;

       }

     printf("Equivalent octal value: %ld", octal_no) ;

     return 0;

}

Sum of diagonal elements in Matrix

Q)Write a C program to find the sum of diagonal elements in  matrix.
Hint: 
        1    2    3
        4    5    6
        7    8    9
First diagonal elements are 1,5,9
Second diagonal elements are 3,5,7.

Sol)
 

#include<stdio.h>
#include<conio.h>
#define MAX 5

int main()
{
    int mat[MAX][MAX],row,col ;
    int i,j,d1=0,d2=0 ;

    printf("Enter no. of rows and columns : ") ;
    scanf("%d%d",&row,&col) ;

    printf("Enter the elements of matrix: \n") ;
    if(row==col)
       {
             for(i=0; i<row; i++)
                   {
                         for(j=0; j<col; j++)
                                 scanf("%d",&mat[i][j]) ;
                     }
              for(i=0, j=col-1; i<row || j>=0; i++,j--)
                     {
                             d1=d1+mat[i][i] ;
                             d2=d2+mat[i][j] ;
                      }
            
               printf("\nThe sum of first diagonal elements : %d", d1) ;
               printf("\n The sum of second diagonal elements : %d", d2) ;
         }
     else
          {
                printf("Rows and Columns are not equal !!") ;
                printf("\n Try again !!") ;
           }

      getch();
      return 0;
}

                                    :::::OUTPUT::::

Enter no. of rows and columns : 3  2
Enter the elements of matrix:
Rows and Columns are not equal !!
Try again !!
  
Enter no of rows and columns : 3  3
Enter the elements of matrix:
1   2   3
4   5   6
7   8   9
The sum of first diagonal elements : 15
The sum of second diagonal elements : 15

Count the number of digits using while loop

Q) C program to count the number of digits in a number using while loop.

Sol)

#include<stdio.h>

int main()

{

    int num,count=0;

   printf("Enter a number : ") ;

   scanf("%d",&num);

   

   while(num)

      {

          num=num/10;

          count++ ;

       }

   

   printf("\nTotal digits is :  %d",count) ;

   return 0;

}

Subtraction of two matrices

Q)Write a C program for SUBTRACTION of two matrices.

Sol)

#include<conio.h>

#include<stdio.h>

int main()

{

   int a[3][3],b[3][3],c[3][3],i,j ;

   printf("Enter the first matrix->") ;

   for(i=0;i<3;i++)

      {

            for(j=0;j<3;j++)

               {

                    scanf("%d",&a[i][j]) ;

                }

        }

     printf("\nEnter the Second matrix->");

     for(i=0;i<3;i++)

       {

            for(j=0;j<3;j++)

               {

                    scanf("%d",&b[i][j]) ;

                }

        }

     for(i=0;i<3;i++)

         {

              for(j=0;j<3;j++) 

                  {

                       c[i][j]=a[i][j]-b[i][j] ;

                   }

          }

     printf("\nResultant matrix after Subtraction->\n ") ;

     for(i=0;i<3;i++)

      {    printf("\n");

            for(j=0;j<3;j++)

               {

                   printf("%d\t",c[i][j]) ;

                }

       }

    return 0; 

}

Addition of two matrices

Q) Write a C program for addition of two matrices using arrays.

#include<stdio.h>

#include<conio.h>

int main()

{

    int a[3][3],b[3][3],c[3][3],i,j ;

    printf("Enter the first matrix->") ;

    for(i=0;i<3;i++)

      {

            for(j=0;j<3;j++)

               {

                    scanf("%d",&a[i][j]) ;

                }

       }

    printf("\nEnter the second matrix->") ;

    for(i=0;i<3;i++)

      {

            for(j=0;j<3;j++)

               {

                    scanf("%d",&b[i][j]) ;

                }

       }

    

    for(i=0;i<3;i++)

       {

            for(j=0;j<3;j++)

               {

                  c[i][j]=a[i][j]+b[i][j] ;

                }

        }

     printf("\nThe addition of two matrix is -> \n ") ;

     for(i=0;i<3;i++)

       {    printf("\n") ;

             for(j=0;j<3j++)

                {

                     printf("%d\t",c[i][j]) ;

                 }

        }

      return 0;

}