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capacity() in String Class in CPP of Programming in CPP
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Usage 
The capabilty function is used to return size for the string in bytes based on store space assigned.
Syntax 
str.capacity()
Example
#include <iostream>
#include <string>

int main ()
{
  std::string p ("Welcome");
  std::cout << "size of welcome: " << p.size() << "\n";
  std::cout << "length of welcome: " << p.length() << "\n";
  std::cout << "capacity of welcome: " << p.capacity() << "\n";
  return 0;
}
Output 
Size of welcome:=9
Length of welcome:=9
capacity of welcome:=13
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