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```// Online C compiler to run C program online
#include <stdio.h>
ADDITION(int a[][4], int b[][4], int n)
{
int i,j,c[4][4];
printf("\n Addition of Matrix is:\n");
for(i=0;i<n;i++)
for(j=0;j<n;j++)
c[i][j]=a[i][j]+b[i][j];

for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
printf("%d ",c[i][j]);
}
printf("\n");
}
}
SUBSTRACTION(int a[][4], int b[][4], int n)
{
int i,j,c[4][4];
printf("\n Substraction of Matrix is:\n");
for(i=0;i<n;i++)
for(j=0;j<n;j++)
c[i][j]=a[i][j]-b[i][j];

for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
printf("%d ",c[i][j]);
}
printf("\n");
}
}
MULTIPLICATION(int a[][4], int b[][4], int n)
{
int i,j,k,c[4][4];
printf("\n Multiplication of Matrix is:\n");
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
c[i][j]=0;
for(k=0;k<n;k++)
{
c[i][j]=c[i][j]+a[i][k]*b[k][j];
}
}
}
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
printf("%d ",c[i][j]);
}
printf("\n");
}
}

int main()
{
int a[4][4],b[4][4],c[4][4];
int i,j,n,choice;
char ch;
printf("\n Enter size of matrix");
scanf("%d",&n);
printf("\n Enter the elenemts in 1st matrix");
for(i=0;i<n;i++)
for(j=0;j<n;j++)
scanf("%d",&a[i][j]);
printf("\n Enter the elenemts in 2nd matrix");
for(i=0;i<n;i++)
for(j=0;j<n;j++)
scanf("%d",&b[i][j]);
do
{
printf("\n 1. Addition");
printf("\n 2. Substraction");
printf("\n 3. Multiplication");
printf("\n Enter Your choice");
scanf("%d",&choice);
switch(choice)
{
case 1: ADDITION(a,b,n);    break;
case 2: SUBSTRACTION(a,b,n);    break;
case 3: MULTIPLICATION(a,b,n);  break;
}
printf("\n Do You want to Continue Y or N");
scanf("\n%c",&ch);
}while(ch=='Y'||ch=='y');
return 0;
}```