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at() in String Class in CPP of Programming in CPP
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Usage 
The at function is used to return the character based on particular position in the given string.
Syntax 
str.at(number)
Example
#include <iostream>
#include <string>

int main ()
{
  std::string str ("Welcome to CPP");
  for (unsigned i=0; i<str.length(); ++i)
  {
    std::cout << str.at(i);
  }
  return 0;
}
Output 
welcome to CPP
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