All C++ codes for learners

Posted by ByteSounds

on Wednesday, December 15, 2010

Question # 1 Multiply two matrices

void multiply()
{

int r,x,y,c;
float a[10][10],b[10][10],d[10][10]={0};
cout<<"enter no. of rows of matrix A = ";
cin>>r;
cout<<"enter no. of columns of matrix A = ";
cin>>x;
cout<<"enter no. of rows of matrix B =";
cin>>y;
while (x!=y)
{
cout<<"the given order is not compatible for multiplication of matrices\n";
cout<<"enter no. of rows of matrix B =";
cin>>y;
}
cout<<"enter no. of columns of matrix B = ";
cin>>c;
cout<<"\nenter the values of matrix A\n";
input (a,r,x);
cout<<"\nenter the values of matrix B\n";
input (b,y,c);
for (int p=0;p<r;p++)
for (int j=0;j<c;j++)
 for (int i=0;i<x;i++)
d[p][j]=d[p][j]+a[p][i]*b[i][j];
cout<<"\nthe product A*B is\n\n";
output (d,r,c);

         //* CHAP # 2     Q # 24 *//
    //* Find whether an intger is even or odd *//

#include <iostream.h>
void main ()
{
 int a;
 cout <<"Enter an integer";
 cin>>a;
 cout <<endl<<endl<< endl;
 if (a%2==0)
    cout <<"The integer is even ";
 else
   cout <<"The integer is odd  ";

}



                          //* CHAP # 2    Q # 26 *//
             //* PRINT  THE specified patterrn according to the no of stars & lines by the user*

     #include <iostream.h >
     void main ()
     {
       int n;
       cout <<"Enter the no Of stars";
       cin>>n;
       for(int i=0 ; i<n; i++ )
        {
    if(i%2==0)
     { for(int j=0; j<n ;j++)
  { cout <<"*";  }
                cout<<endl;
             }
    else
      { cout<<" ";
  for(int k=0 ; k<n ;k++)
   { cout <<"*";}
        cout<<endl;
              }
        }

      }

//* CHAP # 2 Q # 18 *//
//* Enter two integers and show which one is greater*//

#include <iostream.h>
void main ()
{ int a,b;
cout <<"Enter two integers\n";
cin>>a>>b;
if(a>b)
cout <<a<<"greater than"<<b;
else
cout <<b<<"greater than"<<a;
}