p280 나이입력 do while , switch

#include <stdio.h>

int main(void)
{
	int age;

	do {
		printf("how old r u?");
		scanf("%d", &age);
	} while (age<1);

	switch (age / 10)
	{
	case 0:
		printf("<10\n");
		break;
	case 1:
		printf("10<u<20\n");
		break;
	case 2:
		printf("20<=u<30\n");
		break;
	case 3:
		printf("30<=u<40\n");
		break;
	case 4:
		printf("40<=u<50\n");
		break;
	case 5:
		printf("50<=u<60\n");
		break;
	default:
		printf("60<u\n");
	
	}


	return 0;
}