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题目：实现计算机程序

解答：

该程序运用函数指针数组，具体请看代码

代码：

#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, y;int input = 1;int ret = 0;int(*p[5])(int x, int y) = { 0, add, sub, mul, div }; //函数指针数组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("输入操作数：");scanf("%d %d", &x, &y);ret = (*p[input])(x, y);printf("ret = %d\n", ret);}else if (input == 0){printf("退出计算器！\n");}else{printf("输入有误！\n");}} while (input);return 0;
}