c++ - How to add a question mark to the end of a line? -

i want check see if user added ? end of buffer. if not, want program add 1 automatically. have far. dont know next.

first check see if buffer not blank.
then, if last item not ?, add question mark automatically buffer , copy content current data node.

if ( strlen(buffer) != 0) {    if (buffer[strlen(buffer)-1] != '?')    {             //what put here add ? if theres non?        }  strcpy(current->data,buffer);  } 

from can see, don't gain modifying buffer in way. can add ? current->data if needed.

int len = strlen(buffer); strcpy(current->data, buffer); if (len && buffer[len-1] != '?') {     current->data[len] = '?';     current->data[len+1] = '\0'; } 

if option, should consider changing code use std::string instead.

std::string buffer = input(); if (!buffer.empty() && buffer.back() != '?') buffer += '?'; std::copy(buffer.begin(), buffer.end(), current->data); current->data[buffer.size()] = '\0'; 

if don't have c++11 compiler, use *buffer.rbegin() instead of buffer.back().