C++ 不能减去两个字符串

Question

我想在这段代码中减去两个字符串，但它不让我这样做并给出一个运算符 - 错误。这段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!

#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;
}

Answer 1

你应该使用 std::string::substr。像这样减去字符串是无效的。

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

第一个参数是要提取的子串的起始索引，第二个参数是子串的长度。