题解 | #实现简单计算器功能#

#include <iostream>
using namespace std;

int main() {

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

    // write your code here......
    string _str[3];
    string temp = "";
    for (int i = 0, j = 0; i < sizeof(str) && j < 3; i++) {
        if (str[i] != ' ' && str[i] != '\0') {
            temp += str[i];
        } else if (!temp.empty()) {
            _str[j] = temp;
            temp = "";
            j++;
        }
    }

    string symbol = "";
    for (char c : _str[0]) {
        symbol += tolower(c);
    }

    int num1 = stoi(_str[1]);
    int num2 = stoi(_str[2]);

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

    return 0;
}