Matrix multiplication

/*C programme to multiply mattrix*/
#include <stdio.h>
int main()
{
    int a[10][10], b[10][10], mult[10][10], r1, c1, r2, c2, i, j, k;
    printf("Enter rows and column for first matrix: ");
    scanf("%d%d", &r1, &c1);
    printf("Enter rows and column for second matrix: ");
    scanf("%d%d",&r2, &c2);

/* If colum of first matrix in not equal to row of second matrix, asking user to enter the size of matrix again. */
    while (c1!=r2)
    {
        printf("Error! column of first matrix not equal to row of second.\n\n");
        printf("Enter rows and column for first matrix: ");
        scanf("%d%d", &r1, &c1);
        printf("Enter rows and column for second matrix: ");
        scanf("%d%d",&r2, &c2);
    }

/* Storing elements of first matrix. */
    printf("\nEnter elements of matrix 1:\n");
    for(i=0; i<r1; ++i)
    for(j=0; j<c1; ++j)
    {
        printf("Enter elements a%d%d: ",i+1,j+1);
        scanf("%d",&a[i][j]);
    }

/* Storing elements of second matrix. */
    printf("\nEnter elements of matrix 2:\n");
    for(i=0; i<r2; ++i)
    for(j=0; j<c2; ++j)
    {
        printf("Enter elements b%d%d: ",i+1,j+1);
        scanf("%d",&b[i][j]);
    }

/* Initializing elements of matrix mult to 0.*/
    for(i=0; i<r1; ++i)
    for(j=0; j<c2; ++j)
    {
       mult[i][j]=0;
    }

/* Multiplying matrix a and b and storing in array mult. */
    for(i=0; i<r1; ++i)
    for(j=0; j<c2; ++j)
    for(k=0; k<c1; ++k)
    {
        mult[i][j]+=a[i][k]*b[k][j];
    }

/* Displaying the multiplication of two matrix. */
    printf("\nOutput Matrix:\n");
    for(i=0; i<r1; ++i)
    for(j=0; j<c2; ++j)
    {
        printf("%d  ",mult[i][j]);
        if(j==c2-1)
            printf("\n\n");
    }
    return 0;
}