Display Prime Numbers Using Functions

1#include <stdio.h>
2#include <stdbool.h>
3
4bool isPrime(int num) {
5    if (num <= 1) return false;
6    if (num <= 3) return true;
7    if (num % 2 == 0 || num % 3 == 0) return false;
8    
9    for (int i = 5; i * i <= num; i += 6) {
10        if (num % i == 0 || num % (i + 2) == 0)
11            return false;
12    }
13    return true;
14}
15
16void printPrimesInRange(int low, int high) {
17    printf("Prime numbers between %d and %d:\n", low, high);
18    for (int i = low; i <= high; i++) {
19        if (isPrime(i)) {
20            printf("%d ", i);
21        }
22    }
23    printf("\n");
24}
25
26int main() {
27    int low, high;
28    
29    printf("Enter lower limit: ");
30    scanf("%d", &low);
31    printf("Enter upper limit: ");
32    scanf("%d", &high);
33    
34    printPrimesInRange(low, high);
35    
36    return 0;
37}