C++ String Substrings

Introduction

To create a substring from a string, we use the .substr() member function.

The function returns a substring that starts at a certain position in the main string and is of a certain length.

The signature of the function is: 

.substring(starting_position, length).

Example: 

#include <iostream> 
#include <string> 

int main() //ww  w  .j av a 2 s .c  om
{ 
    std::string s = "Hello World."; 
    std::string mysubstring = s.substr(6, 5); 
    std::cout << "The substring value is: " << mysubstring; 
}

In this example, we have the main string that holds the value of "Hello World."

Then we create a substring that only has the "World" value.

The substring starts from the sixth character of the main string, and its length is five characters.




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