/*引用"air5116"改写计算器c4droid*/
#include "stdio.h"
#include "math.h"
void main()
{
      v:    printf
		("                       *********************\n");
	        printf
		("                       **     1.加法运算     **\n");
	        printf
		("                       **     2.减法运算     **\n");
	        printf
		("                       **     3.乘法运算     **\n");
	        printf
		("                       **     4.除法运算     **\n");
	        printf
		("                       **     5.求余运算     **\n");
	        printf
		("                       **     6.累加运算     **\n");
	        printf
		("                       **     7.阶乘运算     **\n");
	        printf
		("                       **     8.退出         **\n");
	        printf
		("                       *********************\n");
	        printf
		("                            请选择功能:");
	int a, b, c, d, e, f, g, t, j;
	scanf("%d", &e);
	if (e != 6&&e != 7&&e != 8)
	{
		printf("请输入两个数字\n");
		scanf("%d", &a);
		scanf("%d", &b);
	}
	else
		switch (e)
		{
		case 1:
			c = a + b;
			goto a;
		case 2:
			c = a - b;
			goto a;
		case 3:
			c = a * b;
			goto a;
		case 4:
			c = a / b;
			goto a;
		case 5:
			c = a % b;
			goto a;
		case 6:
		  b:printf("零+回车结束\n请输入数字\n");
			scanf("%d", &d);
			c = c + d;
			if (d == 0)
				goto a;
			else
				goto b;
			goto a;
		case 7:
			printf("请输入一个数字\n");
			scanf("%d", &g);
			   if (g <= 0)
				   printf("无解\n");

			else
			{
				   for (int i = 1; i <= g; i++)
					   t *= i;
				goto a;
			}
		}
  a:printf("结果为：%d", c);
	printf("%d!=%d\n", g, t);
	printf("\n\n\n\n\n>>>>1菜单\n>>>>2退出\n");
	scanf("%d", &j);
	if (j == 1)
		goto v;
	else
		printf("请点击关闭\n");
 }