HW3

#pragma warning (disable:4996)
#include<stdio.h>

int main() {
	int num = 54321;
	int hour = num / 3600;
	int min = (num - (hour * 3600)) / 60;
	int sec = num - ((hour * 3600) + (min * 60));
	printf("%d초는 %d시간 %d분 %d초 입니다.", num, hour, min, sec );
	return 0;
}

HW4

#pragma warning (disable : 4996)
#include <stdio.h>

int main() {
	double days = 365.2422;
	int day = int(days);
	int hour = int((days - (double)day) * 24);
	int min = int((((days - (double)day) * 24) - hour) * 60);
	double sec = (((((days - (double)day) * 24) - hour) * 60) - min) * 60;
	printf("%.4lf일은 %d일 %d시간 %d분 %.2lf초입니다.", days, day, hour, min, sec);
	return 0;
}

HW5

#pragma warning (disable : 4996)
#include <stdio.h>

int input();
void output(double);

int main() {
	int use = input();
	double res = ((660.0 + (double(use)* 88.5)) * 1.09);
	output(res);
	return 0;
}

int input() {
	int num;
	printf("전기 사용량을 입력하세요(kw): ");
	scanf("%d", &num);
	return num;
}

void output(double num) {
	printf("전기 사용요금은 %lf 원 입니다.", num);
	return;
}

HW6

#pragma warning (disable : 4996)
#include <stdio.h>

int input();
void output(double);

int main() {
	int f = input();
	double c = (5.0 / 9)*double(f - 32);
	output(c);
	return 0;
}

int input() {
	int num;
	printf("화씨 온도를 입력하세요 : ");
	scanf("%d", &num);
	return num;
}

void output(double num) {
	printf("섭씨 온도는 %.1lf 도입니다.", num);
	return;
}