用c语言编写一个计算机

在C语言中编写一个简单的计算器程序是一个常见的练习。下面是一个基础的控制台版四则运算计算器的例子：

#include <stdio.h>

// 定义函数来执行加法、减法、乘法和除法
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) {
    if (b != 0) {
        return a / b;
    } else {
        printf("Error: Division by zero is not allowed.\n");
        return 0; // 避免除以零的情况
    }
}

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

    printf("Enter the first number: ");
    scanf("%d", &num1);
    printf("Enter an operator (+, -, *, /): ");
    scanf(" %c", &operator);
    
    switch (operator) {
        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. Please use +, -, *, or /\n");
    }

    return 0;
}