cin >> int 给定一个字符串将 int 赋值为 0

cin >> int given a string assigns int to 0

本文关键字：gt int 字符串 赋值 一个 cin      更新时间：2023-10-16

我遇到的问题是，如果您输入任何字符串，cin 会将 int 分配给 0。一个有趣的发现是，如果你后来把 cin 带到一个字符串中，你会得到你为 int 输入的整个字符串。 cin.fail(( 总是出于某种原因返回 true，即使使用 cin.ignore(( 等，if(cin>> startingPosition ( 也总是返回 true。那么，我如何让它捕捉到一个偶数识别它是一个字符串而不是一个整数？例如，如果它是一个字符串，我如何让它再次循环？

int getUserPosition(bool volatileCall = false) {
cout << "Which slot do you want to drop the chip in (0-8)? " << endl;
int startingPosition;
cin >> startingPosition;
while (startingPosition >= WIDTH || startingPosition < 0) {
cout << "Invalid slot." << endl << endl;
if (volatileCall) {
return -1;
}
cout << "Which slot do you want to drop the chip in (0-8)? " << endl;
cin >> startingPosition;
cout << startingPosition << endl;
}
return startingPosition;
}

您必须从 CIN 保存结果

isNumber = (cin >> startPosition);

整个代码将如下所示

int getUserPosition(bool volatileCall = false) {
cout << "Which slot do you want to drop the chip in (0-8)? " << endl;
int startingPosition;
bool isNumber = (cin >> startingPosition);
while(isNumber && (startingPosition >= WIDTH || startingPosition < 0)) {
cout << "Invalid slot." << endl << endl;
if (volatileCall) {
return -1;
}
cout << "Which slot do you want to drop the chip in (0-8)? " << endl;
isNumber = (cin >> startingPosition);
cout << startingPosition << endl;
}
return startingPosition;
}
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