【C语言】每日一代码：转移表的代码实现

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>

int add(int a, int b)
{
	return a + b;
}

int sub(int a, int b)
{
	return a - b;
}
int mul(int a, int b)
{
	return a * b;
}

int div(int a, int b)
{
	return a / b;
}

int main()
{
	int x = 0;
	int y = 0;
	int input = 1;
	int ret = 0;
	int (*p[5])(int x, int y) = { 0, add, sub, mul, div };
	do
	{
		printf("*************************\n");
		printf("****  1.add  2.sub   ****\n");
		printf("****  3.mul  4.div   ****\n");
		printf("****     0.exit      ****\n");
		printf("*************************\n");
		printf("请选择：");
		scanf("%d", &input);
		if (input <= 4 && input >= 1)
		{
			printf("请输入需要计算的数字：");
			scanf("%d %d", &x, &y);
			ret = (*p[input])(x, y);
			printf("结果= %d\n", ret);
		}
		else if (input == 0)
		{
			printf("退出计算器\n");
		}
		else
		{
			printf("输入错误\n");
		}
	} while (input);
	return 0;
}