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Introduction
What is CPP Declarning Variable Type casting Symbolic constants
User-defined Functions
Function prototype Call by Reference Return by Reference Default Arguments
Math Library Functions
ceil(x as float) floor(x as float) fabs(x as float) pow(x as int,y as int) sqrt(x as int) exp(x as int) log(x as float)
Math Library Functions [cont'd]
log10(x as float) sin(x as float) cos(x as float) tan(x as float)
Classes and Objects in CPP
What is Class Structure of Class What is Object
String Class in CPP
append() assign() at() begin() capacity()
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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