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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_string_push_back.htm below:

C++ String Push Back

It appends character c to the end of the string, increasing its length by one.

Following is the declaration for std::string::push_back.

void push_back (char c);

void push_back (char c);

void push_back (char c);

c − It is a character object.

none

if an exception is thrown, there are no changes in the string.

In below example for std::string::push_back.

#include <iostream>
#include <fstream>
#include <string>

int main () {
   std::string str;
   std::ifstream file ("sample.txt",std::ios::in);
   if (file) {
      while (!file.eof()) str.push_back(file.get());
   }
   std::cout << str << '\n';
   return 0;
}

string.htm

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