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



void main(void){
	/*initialize*/
	clock_t start_t = 0, end_t = 0;
	
	while(1){
		if(end_t-start_t){
			start_t = end_t;
			/*inerrupt function*/
			secint();	//interrupted every second
		}
		else{
			end_t = clock() / CLOCKS_PER_SEC;
		/*main program*/
		
		}
	}
}

void secint(void){
	printf("hi\n");
}