Question

我正在尝试循环一个字符串并将其放在C ++中的地图中但由于某种原因，它会一直排除myMap[0]并且我无法输出字符串的第一个字母。请帮忙。

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

 int main(int argc, char *argv[])
 {

    int inputNumbers;
    map<int,string>myMap;

    cout<<"Enter how many words"<<endl;
    cin>>inputNumbers;
    //insert the words to the map
    for(int i = 0; i < inputNumbers; i++) {

        string inputNames ="";
        cout<<"Enter the word #"<<i+1<<" out of "<<inputNumbers<<endl;

        getline(cin, inputNames);
        myMap[i] = inputNames;

        cin.clear();
        cin.ignore();
    }

    //output map
    for(map<int,string>::iterator it = myMap.begin(); it != myMap.end(); it++)
        cout << it->first << ":" << it->second << endl;
    it->first << ":" << it->second << endl;

    return 0;
}

这是输出

 Enter how many words
 4
 Enter the word #1 out of 4
 Kobe
 Enter the word #2 out of 4
 is
 Enter the word #3 out of 4
 the greatest
 Enter the word #4 out of 4
 ever!!!
 0:
 1:obe
 2:s
 3:he greatest
 Program ended with exit code: 0

如果它是一个字符串单词（没有空格），真正的单词（只有字母），好词（字母和数字），capword（以大写字母开头），还会感谢扫描用户输入字符串并输出的额外提示，首字母缩写词（全部大写字符串）。

Answer 1

我找到了答案!!!!

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

 string inputNames;

 int main()
 {   

     string line;
     vector<string> myVector;
     ifstream myTextFile("myText.txt");

     //stores the lines in file to myVector and pushes it back
     while (getline(myTextFile, line)) {
          //cout<<line<<endl;
          myVector.push_back(line);
     }

     //outputs what's inside the vector
     for(int i=0; i<myVector.size(); i++) {
        cout << i << ":" << myVector[i] << endl;
     }



 return 0;
 }

如何在c ++中正确使用getline

1 个答案: