has substr c++

The substr() function in C++ is used to extract a substring from a given string. It takes two parameters: the starting position (or index) of the substring and the length of the substring. Here is an explanation of each step involved in using substr() in C++:

1. Include the necessary header file: In order to use the substr() function, you need to include the header file at the beginning of your program.

2. Declare a string variable: Create a string variable and assign a value to it. This will be the string from which you want to extract a substring.

3. Call the substr() function: To extract a substring from the string, call the substr() function on the string variable. Pass the starting position and the length of the substring as arguments to the function.

4. Store the result: The substr() function returns a new string that contains the extracted substring. You need to store this returned value in another string variable.

5. Use the extracted substring: Once you have the substring stored in a separate variable, you can use it as required in your program. You can print it, manipulate it, or perform any other operations on it.

Note: The starting position for substr() is zero-based, meaning the first character of the string has an index of 0. The length parameter specifies the number of characters to include in the substring.

That's it! You have successfully used the substr() function in C++ to extract a substring from a given string. Let me know if you have any further questions.