Sum of each row and coloumn and the matrix

#include <stdio.h>
int main()
{
    int a[10][20],i,j,r,c,rsum,csum,sum=0;
    printf("Enter the order of the matrix\n");
    scanf("%d%d",&r,&c);
    printf("Now enter the matrix.\n");
    for(i=0; i<r; i++)
        for(j=0;j<c;j++)
            scanf("%d",&a[i][j]);
    printf("The matrix is:-\n");
    for(i=0; i<r; i++)
    {
        for(j=0;j<c;j++)
            printf("%d\t",a[i][j]);
        printf("\n");
    }
    for(i=0; i<r; i++)
    {
        rsum=0;
        csum=0;
        for(j=0;j<c;j++)
            {
                rsum += a[i][j];
                csum += a[j][i];
                sum  += a[i][j];
            }
        printf("\nRow %d's sum is %d\n",i,rsum);
        printf("Coloumn %d's sum is %d\n",i,csum);
    }
    printf("\nThe grand total is %d",sum);
}
//Output
//Enter the order of the matrix
//3
//3
//Now enter the matrix.
//1
//2
//3
//4
//5
//6
//7
//8
//9
//The matrix is:-
//1       2       3
//4       5       6
//7       8       9

//Row 0's sum is 6
//Coloumn 0's sum is 12

//Row 1's sum is 15
//Coloumn 1's sum is 15

//Row 2's sum is 24
//Coloumn 2's sum is 18

//The grand total is 45