Question

此程序除了允许在名字和姓氏之间留出空格外，它的工作原理除外。以下是我所谈论的一个例子：

有人可以帮我解决这个问题吗？我相信它在 string playerName 中，因为它不会接受名字和姓氏之间的空格。

#include "stdafx.h"
#include <iostream>
#include <string>
#include <iomanip>
using namespace std;

// Structure to hold the Player Data
struct Player {
    string playerName;
    int playerNumber;
    int pointsScored;

};

// Function Prototypes
void getPlayerInfo(Player &);
void showInfo(Player[], int);
int getTotalPoints(Player[], int);
void showHighest(Player[], int);


int main(int argc, char *argv[])
{
    const int N = 12;
    Player players[N];
    for (int i = 0; i<N; i++) {
        cout << "\nPLAYER #" << i + 1 << "\n";
        cout << "---------\n";
        getPlayerInfo(players[i]);
}

    showInfo(players, N);
    int totalPoints = getTotalPoints(players, N);
    cout << "TOTAL POINTS: " << totalPoints << "\n";
    cout << "The player who scored the most points is :";
    showHighest(players, N);
    cout << "\n";
    system("pause");

    return 0;
}


void getPlayerInfo(Player &P) {
    cout << "Player Name:";
    //cin >> P.playerName;                            **CHANGED THIS**
      cin.ignore(std::numeric_limits<std::streamsize>::max(), ' ');
    std::getline(std::cin, P.playerName);                **TO THIS**
    do {
        cout << "Player Number:";
        cin >> P.playerNumber;
        if (P.playerNumber<0)
            cout << "invalid Input\n";
    } while (P.playerNumber<0);
    do {
        cout << "Points Scored:";
        cin >> P.pointsScored;
        if (P.pointsScored<0)
            cout << "invalid Input\n";
    } while (P.pointsScored<0);

}


void showInfo(Player P[], int N) {
    cout << "\nNAME" << "\t\tNUMBER" << "\t\tPOINTS SCORED" << "\n";
    for (int i = 0; i<N; i++)
        cout << P[i].playerName << "\t\t" << P[i].playerNumber << "\t\t" << P[i].pointsScored << "\n";
}

int getTotalPoints(Player P[], int N) {
    int Points = 0;
    for (int i = 0; i<N; i++)
        Points += (P[i].pointsScored);
    return Points;
}


void showHighest(Player P[], int N) {
    int HighestPoint = P[0].pointsScored;
    string Name = P[0].playerName;
    for (int i = 1; i<N; i++) {
        if (HighestPoint<P[i].pointsScored) {
            HighestPoint = P[i].pointsScored;
            Name = P[i].playerName;
        }
    }
    cout << Name;
}

Answer 1

当std::cin使用operator>>插入std::string时，它会停止在空格（' '）处读取字符。请改用std::getline。

std::getline(std::cin, P.playerName); //read everything up to '\n'

Answer 2

问题在于此代码：

void getPlayerInfo(Player &P) {
cout << "Player Name:";
cin >> P.playerName;//<<----

cin treats＆＃39; ＆＃39; （空格）作为分隔符。如果你想输入＆＃39; ＆＃39; （空间）你需要使用:(感谢@James Root）

//before doing get line make sure input buffer is empty

另见：https://stackoverflow.com/a/10553849/3013996

cin.ignore (std::numeric_limits<std::streamsize>::max(), '\n'); 
std::getline(std::cin,P.playerName);

字符间距的字符串

2 个答案: