用c语言编写实现简单加减乘除整数的简单计算器

在C语言中，我们可以创建一个简单的命令行计算器，用于处理整数的加、减、乘、除运算。下面是一个基础的示例，它会提示用户输入操作数和运算符：

#include <stdio.h>

// 定义计算函数
int add(int a, int b) {
    return a + b;
}

int subtract(int a, int b) {
    return a - b;
}

int multiply(int a, int b) {
    return a * b;
}

int divide(int a, int b) {
    // 防止除数为0的情况
    if (b == 0) {
        printf("Error! Division by zero is not allowed.\n");
        return 0;
    }
    return a / b;
}

int main() {
    int num1, num2;
    char operation;

    printf("Enter the first number: ");
    scanf("%d", &num1);
    
    printf("Enter the second number: ");
    scanf("%d", &num2);

    printf("Enter an operator (+, -, *, /): ");
    scanf(" %c", &operation); // 用 " %c" 来消除多余的空白字符

    switch(operation) {
        case '+':
            printf("Result: %d\n", add(num1, num2));
            break;
        case '-':
            printf("Result: %d\n", subtract(num1, num2));
            break;
        case '*':
            printf("Result: %d\n", multiply(num1, num2));
            break;
        case '/':
            printf("Result: %d\n", divide(num1, num2));
            break;
        default:
            printf("Invalid operator!\n");
    }

    return 0;
}