题解 | #实现简单计算器功能#

#include <cctype>
#include <iostream>
using namespace std;

int main() {

    // char str[100] = { 0 };
    // cin.getline(str, sizeof(str));

    // write your code here......
    string op;
    int num1, num2;
    cin >> op >> num1 >> num2;
    // cout << op << num1 << num2;

    for (int i = 0; i < 3; i++) {
        op.at(i) = tolower(op.at(i));
    }

    if (op == "add") {
        cout << num1 + num2 << endl;
    } else if (op == "sub") {
        cout << num1 - num2 << endl;
    } else if (op == "mul") {
        cout << num1* num2 << endl;
    } else if (op == "div") {
        if (num2 == 0) {
            cout << "Error" << endl;
        } else {
            cout << num1 / num2 << endl;
        }
    }


    return 0;
}