当我尝试从数组中打印一个字符串时，它不起作用(C ）

When I try to print a string from my array it is not working (C++)

本文关键字：字符串 一个 不起作用 数组 打印      更新时间：2023-10-16

这是我的代码：

我要做的是让用户输入一堆字符串，然后用户说您刚刚写过的列表中的哪个字符串会向您说回来。

#include <iostream>
#include <string>
using namespace std;
int amount = 0;
int listnum;
string inpu;

void input(string in){
cout << "Enter a word" << endl;
cin >> in;
}

int main()
{
cout << "How many strings do you want to enter." << endl;
cin >> amount;
string list1[amount];
for(int x = 0; x < amount; x++){
    input(inpu);
    list1[x] = inpu;
    if(x == amount-1){
        cout << "Which word on the list do you want to use?" << endl;
        cin >> listnum;
        cout << list1[listnum] << endl;
    }
}
}

我不确定发生了什么，所以我真的会喜欢帮助。

谢谢！

我不知道您遇到了什么问题。我看到了这个问题：

void input(string in){
    cout << "Enter a word" << endl;
    cin >> in;
}

尝试将A 参考转到您的变量：

void input(string &in){
cout << "Enter a word" << endl;
cin >> in;
}

，也可以通过指针：

void input(string *in){
cout << "Enter a word" << endl;
cin >> *in; //Now that this is a pointer, you need to add a * before the variable name when you want to access it.
}

如果您通过指针，请确保用指针调用功能：

input(&inpu);

传递指针是在C中执行此操作的唯一方法

没有办法用普通数组在C 中说的话。C 解决方案是通过使用为您提供std :: vector的STL库。

#include <iostream>
#include <string>
#include <vector>
using namespace std;
    int main() {
        vector<string> list1;//This creates a vector 
        string in = "";
        int amount = 0;
        int listnum = 0;

        cout << "How many strings do you want to enter." << endl;
        cin >> amount;
        //This for loop will append the item into the vector list
        //The for loop will control how many item will be appended to the list
        for (int i = 0; i < amount; i++) {
            cout << "Enter a word" << endl;
            cin >> in;
            //The push back function will push the string into the vecot
            list1.push_back(in);
        }
        //This will ask the user for the index position of the word
        cout << "Which index on the list do you want to use?" << endl;
        cin >> listnum;
        //This line of code will output the string that the user wants
        cout << list1[listnum] << endl;

        system("pause");
        return 0;
    }
相关文章：