Random numbers in an interval in C

main.c

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

int rand_interval(int a, int b) {
    return rand() % (b - a) + a;
}

int main(int argc, char* argv[]) {
    srand(time(NULL));
    
    for (int i = 0; i < 100; i++) {
        printf("%d ", rand_interval(5, 20));
    }
    
    return 0;
}