編寫思路：使用switch語句來選擇運算

#include<stdio.h>

int main()

{

int x, y, z;

char c;

printf("格式為：資料運算子資料\n");

printf("請輸入：");

scanf_s("%d%c%d", &x, &c, 1, &y);//在vs2017中輸入字元型變數需要定義長度否則出錯

switch (c)

{

case "+":

z = x + y;

break;

case "-":

z = x - y;

break;

case "*":

z = x * y;

break;

case "/":

z = x / y;

break;

default:

printf("erro!");

break;

}

printf("%d", z);

return 0;

}