Matrix Multiplication - C Program

Program:
#include<stdio.h>
//#include<conio.h>
int a[10][10],b[10][10],c[10][10],i,j,k;

void read(int r1,int c1,int a[10][10])
{   
       for(i=0;i<r1;++i)
       for(j=0;j<c1;++j)
       scanf("%d",&a[i][j]);
}

void mul(int r1,int c2,int c1)
{
     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]=c[i][j]+a[i][k]*b[k][j];
    }
}

void printmat(int r1,int c2)
{
     for(i=0;i<r1;++i)
    {         
          for(j=0;j<c2;++j)
          printf("%d\t",c[i][j]);
        printf("\n");
         }
}

void main()
{
     int r1,c1,r2,c2;//clrscr();
    printf("Enter order of matrix 1:");
    scanf("%d %d",&r1,&c1);
    printf("Enter order of matrix 2:");
    scanf("%d %d",&r2,&c2);
    if(c1!=r2)
     printf("Matrices cannot be multiplied");
    else
    {
        printf("Enter Elements for matrix 1:\n");
         read(r1,c1,a);
        printf("Enter Elements for matrix 2:\n");
          read(r2,c2,b);
         mul(r1,c2,c1);
        printf("Resultant matrix :\n");
          printmat(r1,c2);
        }
//    getch();
}

Output:
nn@linuxmint ~ $ gcc c9.c
nn@linuxmint ~ $ ./a.out
Enter order of matrix 1:2
2
Enter order of matrix 2:2
2
Enter Elements for matrix 1:
1
1
1
1
Enter Elements for matrix 2:
2
2
2
2
Resultant matrix :
4    4   
4    4   
nn@linuxmint ~ $

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