简答题 编写一程序，打印一个四则运算的菜单，用户选择其中一种运算，接着提示用户输入两个整数，并在控制台窗口打印运算结果。

Question

Answer 1

#include<stdio.h>
int main(void){
    int a,b,c;
    printf("[1] Add\n");
    printf("[2] Subtract\n");
    printf("[3] Multipy\n");
    printf("[4] Divide\n");
    printf("Enter your choice:");
    scanf("%d",&c);
    printf("first num:");
    scanf("%d",&a);
    printf("second num:");
    scanf("%d",&b);
    switch(c){
        case 1:
            printf("%d+%d=%d",a,b,a+b);
            break;
        case 2:
            printf("%d-%d=%d",a,b,a-b);
            break;
        case 3:
            printf("%d*%d=%d",a,b,a*b);
            break;
        case 4:
            printf("%d/%d=%.2f",a,b,a*1.0/b);    
            //printf("%d/%d=%d",a,b,a/b);  不需要小数的话，取整就用这个输出
            break;
    }
    return 0;
}