Populating a dynamically allocated 2D array

I am trying to populate a dynamically allocated 2D array.

Specifically, I am trying to input random numbers into an array.

Code below:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(void)
{

int i, j, num_students = 10, num_grades = 4;
int **array;

srand(time(NULL));


array = malloc(sizeof(int *) * num_students);

for (i = 0; i < num_students; ++i)
    array[i] = malloc(sizeof(int) * num_grades);

for (i = 0; i < num_students; ++i)
{
    printf("Student %d has grades: ", i);
    for (j = 0; j < num_grades; ++j)
        array[i][j] = rand() % 101;
        printf("%d ", array[i][j]);

    printf("\n");
    free(array[i]);
}

free(array);

return 0;

}

The output:

Student 0 has grades: 0 
Student 1 has grades: 0 
Student 2 has grades: 0 
Student 3 has grades: 0 
Student 4 has grades: 0 
Student 5 has grades: 0 
Student 6 has grades: 0 
Student 7 has grades: 0 
Student 8 has grades: 0 
Student 9 has grades: 0 

I do not know why it is printing 0 instead of the random numbers.