問(wèn)題描述

我正在用 C++ 創(chuàng)建一個(gè)簡(jiǎn)單的控制臺(tái)應(yīng)用程序，它從用戶那里獲取字符串和字符輸入.為簡(jiǎn)單起見(jiàn)，我想使用 string 和 char 數(shù)據(jù)類型將輸入從 cin 傳遞到.

I'm creating a simple console application in C++ that gets string and char inputs from the user. To make things simple, I would like to use the string and char data types to pass input from cin to.

為了獲取字符串輸入，我使用了 getline 方法:

To get string inputs, I'm using the getline method:

string var;
cin.ignore(); //I used ignore() because it prevents skipping a line after using cin >> var
getline(cin, var);

為了獲得字符輸入，我使用了 cin >> var 方法:

To get char inputs, I'm using the cin >> var method:

char var;
cin >> var;

這在大多數(shù)情況下都可以正常工作.但是，當(dāng)我使用 getline 輸入字符串時(shí)，它會(huì)忽略字符串的第一個(gè)字符.

This works fine for the most part. However, when I enter a string using getline, it ignores the first character of my string.

是否可以使用 getline 和 cin >> 而不必使用 ignore，或者我可以調(diào)用的方法來(lái)確保我的沒(méi)有跳過(guò)第一個(gè)字符?

Is it possible to use getline and cin >> without having to use ignore, or a method I can call to ensure that my first character isn't skipped?

這是我同時(shí)使用 getline 和 cin >> 的完整代碼示例:

This is a full sample of code where I use both getline and cin >>:

string firstName;
string lastName;
char gender = 'A';

cout << "First Name: ";
cin.ignore();
getline(cin, firstName);


cout << "Last Name: ";
cin.ignore();
getline(cin, lastName);

while(genderChar != 'M' && genderChar != 'F')
{
    cout << "Gender (M/F): ";
    cin >> genderChar;
    genderChar = toupper(genderChar);
}

推薦答案

cin>>var;

只從緩沖區(qū)中獲取var，而將 留在緩沖區(qū)中，然后立即被 getline

only grabs the var from the buffer, it leaves the in the buffer, which is then immediately grabbed up by the getline

所以，下面就好了，(如果我理解正確的話)

So, following is just fine, (if I understood correctly your problem)

cin>>var;
cin.ignore();     //Skip trailing '
'
getline(cin, var);

根據(jù)您的編輯帖子

你不必為 geline 使用 cin.ignore();

這從緩沖區(qū)中提取字符并將它們存儲(chǔ)到 firstName 或 (lastName) 直到這里的分隔符 -newline (' ').

This extracts characters from buffer and stores them into firstName or (lastName) until the delimitation character here -newline (' ').

這篇關(guān)于為什么在 cin.ignore() 之后沒(méi)有 getline(cin, var) 讀取字符串的第一個(gè)字符?的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！