How to split random numbers in C and get a frequency count of each digit without using an array?

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

int main()
{



srand(time(NULL));



for(int i = 0; i < 200; i++){

    printf("%d\n", rand() % 1000);


}






int num = 123;     // Playing around trying to figure out how to split a single number.

printf("%d\n", num % 10);
printf("%d\n", num / 10 % 10);
printf("%d\n", num / 100 % 10);





return 0;
}

I am trying to generate 200 random numbers between 0-999, split them into digits and get a frequency count of each digit without using any arrays. I played around and figured out how to split a single number (in reverse order) and how to generate the random numbers. Now how do I split all 200 numbers and store those digits in variables I can get a count with? Do I want three variables maybe named digit1, digit2, digit3?

Note: This is for homework so I'm not allowed to use arrays and must use a switch statement for frequency counting of each digit.