Matrix Multiplication Program in C- Programmer's Mind

Matrix Multiplication:

In programming Matrices will be stored in Two Dimensional Arrays.
process of multiplication in general

Precondition:

Number of columns in First matrix should be equal to Number of rows in the second matrix.

In below Example Two matrices of order 2*2.Here Matrix Multiplication is possible as the Precondition is satisfied.Order of resultant matrix also 2*2 (Rows in first Matrix * Columns in second Matrix)

Program For Matrix Multiplication

#include<stdio.h>
void main()
{
int r1,c1,r2,c2,i,j,k,a[5][5],b[5][5],c[5][5];
//Reading First Matrix
printf("Enter Number of rows and columns of First Matrix:\n");
scanf("%d %d",&r1,&c1);
for(i=0;i<r1;i++)
{
for(j=0;j<c1;j++)
{
printf("Enter a[%d][%d]",i,j);
scanf("%d",&a[i][j]);
}
}
//Reading Second Matrix
printf("Enter Number of rows and columns of Second Matrix:\n");
scanf("%d %d",&r2,&c2);
for(i=0;i<r2;i++)
{
for(j=0;j<c2;j++)
{
printf("Enter a[%d][%d]",i,j);
scanf("%d",&b[i][j]);
}
}
// Checking precondition
if(c1==r2)
{
for(i=0;i<r1;i++)
{
for(j=0;j<c2;j++)
{
c[i][j]=0;
for(k=0;k<c1;k++)
{
c[i][j]+=a[i][k]*b[k][j];
}
}
}
printf("Resultant Matrix:\n");
for(i=0;i<r1;i++)
{
for(j=0;j<c2;j++)
{
printf("%d ",c[i][j]);
}
printf("\n");
}
}
else
{
printf("Multiplication not possible");
}
}