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assign() in String Class in CPP of Programming in CPP
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Usage 
The assign method is used to replace current contents with new string value.
Syntax 
str.assign(string);
Example
#include <iostream>
#include <string>

int main ()
{
  std::string p;
  std::string cont="welcome to CPP";

  str.assign(cont);
  std::cout <<p << '\n';

  str.assign(cont,12,3);
  std::cout << p<< '\n';       
  return 0;
}
Output 
Welcome to CPP
CPP
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String Class in CPP of Programming in CPP
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