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Program to perform different functions on matrices like addition, Subtraction and multiplication.

         //header files
#include<iostream.h>
#include<conio.h>
        //function prototypes
void add();
void sub();
void multi();
void option();
void conti();

int a1[10][10],a2[10][10],r1,c1,r2,c2,i,j;
        //main function
void main()
{
clrscr();
cout<<"\t\n ***PROGRAM to show different operations on 2-D ARRAY***\n\n\n";
cout<<"Enter the number of rows for matrix 1 = ";
cin>>r1;
cout<<"\n\nEnter the number of columns for matrix 1 = ";
cin>>c1;
cout<<"\n\nEnter the element of first matrix\n";
for(i=1;i<=r1;i++)
{
cout<<"\n";
for(j=1;j<=c1;j++)
{
cout<<"\t";
cout<<"a1["<<i<<"]["<<j<<"] = ";
cin>>a1[i][j];
}
}
cout<<"\n\nEnter the number of rows for matrix 2 = ";
cin>>r2;
cout<<"\n\nEnter the number of columns for matrix 2 = ";
cin>>c2;
cout<<"\n\nEnter the elements of second matrix\n";
for(i=1;i<=r2;i++)
{
cout<<endl;
for(j=1;j<=c2;j++)
{
cout<<"\t";
cout<<"a2["<<i<<"]["<<j<<"] = ";
cin>>a2[i][j];
}
}
cout<<"\n\nDisplaying matrix 1\n\n";
for(i=1;i<=r1;i++)
{
cout<<"\n";
for(j=1;j<=c1;j++)
{
cout<<"\t";
cout<<a1[i][j];
}
}
cout<<"\n\nDisplaying matrix 2\n\n";
for(i=1;i<=r2;i++)
{
cout<<"\n";
for(j=1;j<=c2;j++)
{
cout<<"\t";
cout<<a2[i][j];
}
}
option();
conti();
getch();
}
        //function for matrix additon
void add()
{
int s[10][10];
if(r1==r2&&c1==c2)
{
for(i=1;i<=r1;i++)
{
for(j=1;j<=c1;j++)
{
s[i][j]=a1[i][j]+a2[i][j];
}
}
cout<<"\n\nResult after addition\n\n";
for(i=1;i<=r1;i++)
{
cout<<endl;
for(j=1;j<=c1;j++)
{
cout<<"\t";
cout<<s[i][j];
}
}
}
else
{
cout<<"\n\nMatrices addition not possible.....";
}
}
          //function for matrix subtraction
void sub()
{
int s[10][10];
if(r1==r2&&c1==c2)
{
for(i=1;i<=r1;i++)
{
for(j=1;j<=c1;j++)
{
s[i][j]=a1[i][j]-a2[i][j];
}
}
cout<<"\n\nResult after subtraction\n\n";
for(i=1;i<=r1;i++)
{
cout<<endl;
for(j=1;j<=c1;j++)
{
cout<<"\t";
cout<<s[i][j];
}
}
}
else
{
cout<<"\n\nMatrices subtraction not possible.....";
}
}
       //function for matrix multipliction
void multi()
{
int m[10][10];
if(c1==r2)
{
for(i=1;i<=r1;i++)
{
for(j=1;j<=c2;j++)
{
m[i][j]=0;
for(int k=1;k<=r2;k++)
{
m[i][j]+=a1[i][k]*a2[k][j];
}
}
}
cout<<"\n\nResult after multiplication\n";
for(i=1;i<=r1;i++)
{
cout<<endl;
for(j=1;j<=c2;j++)
{
cout<<"\t";
cout<<m[i][j];
}
}
}
else
{
cout<<"\nMultiplication not possible....";
}
}
     //function for choosing desire operation
void option()
{
int ss;
cout<<"\n\n Choose the operation you want to apply\n\n";
cout<<" PRESS 1 for ADDITION\n PRESS 2 for SUBTRACTION\n PRESS 3 for MULTIPLICATION\n PRESS 4 for EXIT the program...";
cout<<"\n\nEnter your choice = ";
cin>>ss;
switch(ss)
{
case 1:
add();
break;

case 2:
sub();
break;

case 3:
multi();
break;

case 4:
break;

default:
break;
}
}
      //function for continuing the program on user basis
void conti()
{
int c;
cout<<"\n\nDo you want to proceed...\n";
cout<<"\n1) YES (proceeding with same matrix)\n2) NO\n3) RESTART\n";
conti:
cout<<"\nEnter your choice = ";
cin>>c;
switch(c)
{
case 1:
option();
break;

case 2:
cout<<"\n\nEXITING program..... Press ENTER";
break;

case 3:
main();
break;

default:
cout<<"\nINVALID SELECTION";
goto conti;
}
}
 

Output:

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