100% matrix multiplication slight reduction in code length

// area of triangle according to Heron's formula
// matrix multiplication
#include <stdio.h>
#include<stdlib.h>
void main()
{
  int a[5][5],b[5][5],c[5][5];
  int i,j,k,m,n,p,q;
  /*m,n= no of rows & columns of  matrix a respectively
    p,q = no of rows & columns of  matrix b respectively*/
    printf("\n enter the no of rows and columns of matrix a:");
    scanf("%d%d",&m,&n);
    printf("\n enter the no of rows and columns of matrix b:");
    scanf("%d%d",&p,&q);
    /*lets check if the dimensions of matrices are compatible or not for multiplication.  columns of 1st matrix must equal rows of 2nd matrix for multiplication to exist*/
   if(n!=p)
   {
       printf("\n multiplication not possible");
       exit(0);
   }
   else
   {
       /*enterning values in matrix a begins*/
       for(i=0;i<m;i++)
       {
           for(j=0;j<n;j++)
           {
               printf("\n enter a[%d][%d]:",i,j);
               scanf("%d",&a[i][j]);
           }
       } //enterning data of matrix a is over
       
       /*enterning values in matrix a begins*/
       for(i=0;i<p;i++)
       {
           for(j=0;j<q;j++)
           {
               printf("\n enter b[%d][%d]:",i,j);
               scanf("%d",&b[i][j]);
           }
       } //enterning data of matrix b is over
       printf("\n\n");
       /*calculation & printing of elements of c begins*/
       for(i=0;i<m;i++)
       {
           for(j=0;j<q;j++)
           {
               c[i][j]=0;
               for(k=0;k<n;k++)
               {
                   c[i][j]=c[i][j]+a[i][k]*b[k][j];
               }
               printf("%5d",c[i][j]);
           }
           printf("\n"); //to go to new line after printing each row of the output
       }
   }//end of else
}// end of main
   

  ఔట్పుట్ తెరమీద
   enter the no of rows and columns of matrix a:2
 2
 

 enter the no of rows and columns of matrix b:2 2
 enter a[0][0]:1
 enter a[0][1]:0
 enter a[1][0]:0
 enter a[1][1]:1
 enter b[0][0]:1
 enter b[0][1]:2
 enter b[1][0]:-1
 enter b[1][1]:2
    1    2
   -1    2

గమనిక  the 1st row of the matrix may get printed with some shift on the screen..plz take care of it by adjusting the program accordingly