C Program: Print Prime Numbers Under 100

This is a program written in the C language that prints all prime numbers below 100.

#include <stdio.h>

int isPrime(int num) {
    if (num < 2) {
        return 0;
    }
    for (int i = 2; i * i <= num; i++) {
        if (num % i == 0) {
            return 0;
        }
    }
    return 1;
}

int main() {
    printf("Prime numbers between 1 and 100 are: \n");
    
    for (int i = 2; i <= 100; i++) {
        if (isPrime(i)) {
            printf("%d ", i);
        }
    }
    
    return 0;
}

This program first defines a function called isPrime() to check if a number is prime. Then, in the main function, it iterates through all integers from 2 to 100, and if a number is prime, it will be output. The program will eventually output all prime numbers within 100.