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append() in String Class in CPP of Programming in CPP
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Usage 
The append function is used to add extra string to end of the statement.
Syntax 
str.append(string);
Example
#include <iostream>

int main ()
{
  std::string str;

  str.append("welcome");                      
  str.append("to");                  
  str.append("CPP");         
  std::cout << str << '\n';
  return 0;
}
Output 
welcome to CPP
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