Prime_Num_under_scale.c

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

int scale = 0;
int i = 0;
int j = 0;
int is_p = 0;

scanf("%d", &scale);
//calculate every int lower than scale
for(i=2; i<=scale; i++){
	//Suppose i is prime number
	is_p = 1;
	//Check every number, exclusive of '1', lower than i will not be divisiable
	for(j=2; j<i; j++){
		if(i%j == 0){
			//i is divisiable by j, so i is not prime number
			is_p = 0;
			break;
		}
	}
	if(is_p == 1){
		printf("%d\n", i);
	}
}