How to replace a value in a string with another in c++?

Question

if I have a string eg

2,4,-1,3,-1,

how do I replace all the -1's with the word "wrong"? and how do I remove the comma at the very end? the output has come from an array

cout<<array[c]<<",";

I need a basic solution please thank you

You need to show more context. You don't really have a string at all in the example. Or at least its not clear. I am not sure that array is a `std::string` — drescherjm, May 31 '20 at 14:43
Here is how you replace part of a `std::string` [http://www.cplusplus.com/reference/string/string/replace/](http://www.cplusplus.com/reference/string/string/replace/) — drescherjm, May 31 '20 at 14:46

score 0 · Answer 1 · answered May 31 '20 at 15:38

Hard to understand what you are trying to say, better if you edit your question. You could do something like this (stackoverflow answer),

  std::string subject("2,4,-1,3,-1,");
  std::string search("-1");
  std::string replace("wrong");
  size_t pos = 0;

  while ((pos = subject.find(search, pos)) != std::string::npos) 
  {
    subject.replace(pos, search.length(), replace);
    pos += replace.length();
  }

  // Delete last ,
  subject.pop_back();

  std::cout << subject;

How to replace a value in a string with another in c++?

1 Answers1