Example: C Program to Print Prime Numbers from 1 to N using For loop

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// C Program to Print Prime Numbers from 1 to N using For loop
#include <stdio.h>

int main() {
    int x, i, j, f;
    
    printf ("Enter the range number to print the prime numbers:\n");
    scanf ("%d", &x);
    
    printf ("\n\nThe prime numbers between 1 and %d are:\n\n", x);
 
    for (i = 1; i <= x; i++) {
        
        // They are niether prime nor composite if as skip 0 and 1
        if (i == 1 || i == 0) {
            continue;
        }
        
        f = 1;
 
        for (j = 2; j <= i / 2; ++j) {
            if (i % j == 0) {
                f = 0;
                break;
            }
        }
 
        // f = 1 means i is prime and f = 0 means i is not prime
        if (f == 1) {
            printf ("%d ", i);
        }
    }
    return 0;
}