C ++不能减去两个字符串 [英] C++ Can't subtract two strings

问题描述

我想在这段代码中减去两个字符串，但它不会让我这样做，并给出一个运算符 - 错误。这个代码基本上试图将一个完整的输入名称分成两个输出：名字和姓氏。请帮忙！谢谢！

I want to subtract two strings in this code, but it won't let me do it and gives an operator - error. This code basically tries to separate a full input name into two outputs: first and last names. Please Help! Thank you!

#include <iostream>
#include <cstdlib>
#include <string>
using namespace std;

string employeeName, firstName, lastName;
int pos1, difference;

int main() {
    cout << "Enter your full name: " << endl;
    getline(cin, employeeName);

    pos1 = employeeName.find(" ");
    difference = pos1 - 0;
    lastName = employeeName.erase(0,difference);
    firstName = employeeName - lastName;

    cout << lastName << firstName << endl;

    system("pause");
    return 0;
}

推荐答案

$ c> std :: string :: substr 。减去这样的字符串无效。

You should use std::string::substr. Subtracting strings like that is invalid.

firstName = employeeName.substr(0, employeeName.find(" "));

第一个参数是要提取的子字符串的起始索引，第二个参数是长度的子字符串。

The first parameter is the starting index of the substring you want to extract and the second parameter is the length of the substring.

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