multiplication of matrix

#include<stdio.h>
void main()
{
    int a[10][10],b[10][10],c[10][10],r1,c1,r2,c2,r3,c3,i,j,k;
    printf("enter no.of row and colums of matrix a\n");
    scanf("%d%d",&r1,&c1);
    printf("enter no.of row and colums of matrix b\n");
    scanf("%d%d",&r2,&c2);
    if(r1==c2&&c1==r2)
    {
    printf("enter elements of 1st matrix\n");
    for(i=0;i<r1;i++)
    {
    for(j=0;j<c1;j++)
    {
    scanf("%d",&a[i][j]);
    }
    }
    printf("enter elements of 2nd matrix\n");
    for(i=0;i<r2;i++)
    {
    for(j=0;j<c2;j++)
    {
    scanf("%d",&b[i][j]);
    }
    }
    r3=r1;
    c3=c2;
    for(i=0;i<r3;i++)
    {
        for(j=0;j<c3;j++)
        {
            c[i][j]=0;
            for (k=0;k<r3;k++)
            {
                c[i][j]=c[i][j]+a[i][k]*b[k][j];
            }
        }
    }
    for(i=0;i<r3;i++)
    {
    for(j=0;j<c3;j++)
    {
    printf("%d ",c[i][j]);
    }
    printf("\n");
    }
    
}
}