Remove last character from C++ string

Question

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

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

Answer 1

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

This assumes you know that the string is not empty. If so, you'll get an out_of_range exception.

Answer 2

With C++11, you don't even need the length/size. As long as the string is not empty, you can do the following:

if (!st.empty())
  st.erase(std::prev(st.end())); // Erase element referred to by iterator one
                                 // before the end

Answer 3

Faced same situation and found such solution:

CString str;
// working with this variable
if (!str.IsEmpty()) // or if(str.GetLength() > 0)
   str.Delete(str.GetLength()-1);

Maybe it will be useful for someone.

Answer 4

If the length is non zero, you can also

str[str.length() - 1] = '\0';

Answer 5

Simple solution if you are using C++11. Probably O(1) time as well:

st.pop_back();

Answer 6

That's all you need:

#include <string>  //string::pop_back & string::empty

if (!st.empty())
    st.pop_back();