substring in C++

To extract a substring in C++, you can use the substr() function. This function takes two parameters: the starting position of the substring and the length of the substring.

Here are the steps to extract a substring in C++:

1. Declare a string variable that holds the original string from which you want to extract the substring.

2. Determine the starting position of the substring. This can be done by specifying the index of the first character of the desired substring. Remember that the index of the first character in a string is 0.

3. Determine the length of the substring. This can be done by counting the number of characters you want to include in the substring.

4. Use the substr() function to extract the substring. The syntax is as follows: original_string.substr(starting_position, length).

5. Store the extracted substring in a separate string variable.

6. You can now use or manipulate the extracted substring as needed in your program.