实验3

#include<stdio.h>

int main()
{
	float x,sum,d;
	while (scanf("%f", &x) != EOF) {	//这句不能写错写成~的那个结果是错的不知道为什么
		

		if (x < 1000 && x >= 0) {
			d = 1;
			sum = x * d;
			printf("discount = %g,pay = %g\n", d, sum);
		}

		if (x < 2000 && x >= 1000) {
			d = 0.95;
			sum = x * d;
			printf("discount = %g,pay = %g\n", d, sum);
		}

		if (x < 3000 && x >= 2000) {
			d = 0.9;
			sum = x * d;
			printf("discount = %g,pay = %g\n", d, sum);
		}

		if (x < 5000 && x >= 3000) {
			d = 0.85;
			sum = x * d;
			printf("discount = %g,pay = %g\n", d, sum);
		}

		if (x >= 5000) {
			d = 0.8;
			sum = x * d;
			printf("discount = %g,pay = %g\n", d, sum);
		}

	}

	return 0;
}

#include<stdio.h>
//如果N是奇数，则输出0 0，否则，如果N是4的倍数，则输出N/4 N/2，如果N不是4的倍数，则输出N/4+1 N/2
int main()
{
	int n,a;		//a是脚
	scanf("%d",&n);
	
	for(int i=0;i<n;i++)
	{
		scanf("%d", &a);		//在循环内读取a
		if (a % 2 != 0)
			{
				printf("0 0\n");
			}

		else if (a % 4 == 0)
			{
				printf("%d %d", a/4, a/2);
			}
		else 
			{
			printf("%d %d", a / 4 + 1, a / 2);
			}
	}
	
	return 0;

}

#include<stdio.h>

int main()
{
	int n, s;
	while(scanf("%d", &n)!=EOF)
	{
		s = 1;
		
		for (int i = 1; i < n; i++)
		{
			s = (s + 1) * 2;
		}
		printf("%d\n", s);
	}

		return 0;
}

int main()
{
	int n;
	while(scanf("%d", &n)!=EOF)
	{
		int g = 0;
		int b = 0;
		for (int i = 0; i < n; i++)
		{
			int tmp;
			scanf("%d", &tmp);
			if (tmp == 0) //temp可以一个一个读
			{
				g++;
			}
			else { b++; }

		}
		printf("%d %d\n", g, b);

	}

		return 0;
}