Question

如果有人可以查看我的代码，我似乎无法找到它的问题，但我确信我只是不了解push_back / pop_back函数。

该程序旨在创建一个用户输入的向量，并在用户键入“停止”时停止。

肯定是pop_back给了我这个错误，但我不确定我做错了什么或如何改变它，任何帮助都表示赞赏。

代码：

#include <vector>
#include <string>
using namespace std;


int main(){

    vector<string> animals;

    vector<string> ages;
    int const SIZE = 5;
    string stopCheck = "stop";
    string tempUserInput;
    int i = 0;

    //Loop used to gather user input and store it into array, animals and array, ages
    cout << "Please enter up to 5 animal names and ages, or type 'stop' to end" << endl;

    while( i<5 ) {
        cout << i << endl;
        // Taking user input for NAMES

        cout << "Enter the name of an animal: ";
        cin >> tempUserInput;
        animals.push_back(tempUserInput);
        cout << endl;

        cout << animals.size() << endl;

        //Function that automates the tolower function by applying it to each    element automatically
        //transform(animals[i].begin(), animals[i].end(), animals[i].begin(), tolower);

        cout << animals.size() << endl;

        //Checking for a stop input
        if (!animals[i].compare(stopCheck)){
            animals.pop_back();
            i = 5;
        }
        i++;

        return 0;
    }

它没有正确地复制100％，但假设我的初始化是正确的，问题是while循环，我会感激任何帮助。

Answer 1

 if (tempUserInput==stopCheck) { break; }

使用此行检查何时停止！

完整代码：

while( i<5 ) {
    cout << i << endl;
    // Taking user input for NAMES

    cout << "Enter the name of an animal: ";
    cin >> tempUserInput;
    if (tempUserInput==stopCheck) { break; } //thats it !
    animals.push_back(tempUserInput);
    cout << endl;

    cout << animals.size() << endl;

    //Function that automates the tolower function by applying it to each    element automatically
    //transform(animals[i].begin(), animals[i].end(), animals[i].begin(), tolower);

    cout << animals.size() << endl;
    i++;
}

C ++ push_back，pop_back。获取错误：矢量下标超出范围

1 个答案: