Calculate Marks for Many Students

#include <stdio.h>

int main()
{
    int sum[100];
    int studentNo, subjectNo, i, j, marks;

    printf("How many students?\n");
    scanf("%d", &studentNo);
    printf("How many subjects?\n");
    scanf("%d", &subjectNo);

    for(i = 0; i < studentNo; i++)
    {
        sum[i] = 0;
        for(j = 1; j <= subjectNo; j++)
        {
            printf("Enter marks for subject %d of student %d: ", j, i+1);
            scanf("%d", &marks);
            sum[i] += marks;
        }
        printf("\n");
    }

    for(i = 0; i < studentNo; i++)
        printf("Marks of student %d: %d\n", i+1, sum[i]);

    return 0;
}