C++ 从字符串中删除第 N 个字符
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原文地址: http://stackoverflow.com/questions/12692221/
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Deleting N first chars from string
提问by PTS
I want to delete the first 10 chars from a string in C++. How can I do that?
我想从 C++ 中的字符串中删除前 10 个字符。我怎样才能做到这一点？
回答by Michael Krelin - hacker
Like this:
像这样：
str.erase(0,10);
...
...
回答by PiotrNycz
Use std::string::substr:
使用std::string::substr：
try {
str = str.substr(10);
} catch (std::out_of_range&) {
//oops str is too short!!!
}
回答by riwalk
I suspect that there is more code here that you are not showing, and the problem is likely there.
我怀疑这里有更多您没有显示的代码，问题很可能在那里。
This code works just fine:
这段代码工作得很好：
#include <string>
#include <iostream>
using namespace std;
int main(int argc, char **argv)
{
string imgURL = "<img src=\"http://imgs.xkcd.com/comics/sky.png";
string str = imgURL;
int urlLength = imgURL.length();
urlLength = urlLength-10;
str.erase (str.begin(), str.end()-urlLength);
imgURL = str;
cout << imgURL << endl;
return 0;
}
With that said, there are shorter ways to do this, as others have mentioned.
话虽如此，正如其他人所提到的，有更短的方法可以做到这一点。
