Remove last character from C++ string

Question

Hi!

How can I remove last character from a C++ string?

I tried st = substr(st.length()-1); But it didn't work.

Answer 1

For a non-mutating version:

st = myString.substr(0, myString.size()-1);

Answer 2

int main () {

  string str1="123";
  string str2 = str1.substr (0,str1.length()-1);

  cout<<str2; // output: 12

  return 0;
}

Answer 3

buf.erase(buf.size() - 1);

another option is to:

buf[buf.size()-1] = '\0';

Both of these assume you know that the string is not empty. If so, you'll get an out_of_range exception.

Answer 4

if (str.size () > 0)  str.resize (str.size () - 1);

An std::erase alternative is good, but I like the "- 1" (whether based on a size or end-iterator) - to me, it helps expresses the intent.

BTW - Is there really no std::string::pop_back ? - seems strange.