Can you write a C program to print prime numbers from 1 to 100 using for loop?

Answer 1

#include<stdio.h>

#include<math.h>

bool is_prime(unsigned num) { unsigned max, factor;

if (num<2) return false;

if (!(num%2)) return num==2;

max = (unsigned) sqrt((double)num) + 1.0;

for (factor=3; factor<max; ++factor)

if (!(num%factor)) return false;

return true;

}

int main() {

unsigned num;

for (num=1; num<=100; ++num)

if (is_prime(num)) printf ("%u is prime\n", num);

return 0;

}