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==