[英]Why am I getting a segfault on cin?
I am writing a fairly simple exercise (homework), and most of it works, however it sometimes segfaults on cin. 我正在写一个相当简单的练习(家庭作业),并且大多数都有效,但是有时会在cin上出现段错误。 Here is the relevant code.
这是相关的代码。
int main()
{
std::string str = "";
std::cout << "Please select the desired operation:\n";
std::cout << "(A): Generate Decompositions\n";
std::cout << "(B): Generate Acceptable Compositions from S1.txt and S2.txt\n";
std::cout << "cout"; //debug statement
std::cin >> str;
std::cout << "cin"; //debug statement
std::cout << str;
char resp = str.at(0);
std::cout << "resp"; //debug statement
...
}
I get a segfault on std::cin >> str
(I know this because of what "debug statements" are output). 我在
std::cin >> str
上遇到了段错误(我知道这是因为输出了什么“调试语句”)。 But the weird thing is, I only get it when I input 'b' . 但是奇怪的是, 我只有在输入'b'时才能得到它 。 If I input 'a', or any word starting with 'a', it works fine.
如果我输入“ a”或任何以“ a”开头的单词,则可以正常工作。 If I enter any letter other than a or b, or anything starting with any other letter than a or b, it exits (as it's supposed to).
如果我输入a或b以外的任何字母,或以a或b以外的任何其他字母开头的任何东西,它就会退出(如预期的那样)。 But if I type in 'b', or any word starting with 'b', it Segfaults.
但是,如果我输入“ b”或任何以“ b”开头的单词,则会出现Segfaults。 Every single time.
每一次。 Why?
为什么?
I know this because of what "debug statements" are output"
我知道这是因为输出了什么“调试语句”
The code that you posted looks fine. 您发布的代码看起来不错。
Since your output statements do not have << endl
at the end, some of the output may still be buffered at the time of segfault. 由于您的输出语句末尾没有
<< endl
,因此某些输出可能仍会在segfault时被缓冲。 Writing out endl
blocks until the output is flushed, so adding << endl
is likely to help you get closer to the actual location of the crash. 写出
endl
块,直到刷新输出为止,因此添加<< endl
可能会帮助您更接近崩溃的实际位置。
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