In C++ code, write a program with the following two functions. Both functions must be RECURSIVE FUNCTIONS and HAVE COMMENTS explaining what each part of the program is doing. The program should match the program run screen below.

Recursive function 1:

int sum(int n);

// Recursive version to calculate the sum of

// 1+2+....+n

Recursive function 2:

int str_length(char s[]); // Recursive version of strlen in C strings. // It returns the length of the string s[]. // (the null character, '\0', is not counted in the length)

Program run screen:

Enter a positive integer: 10

The sum of 1+2+...+10 is: 55

Enter a sentence: Hello World!

It contains 12 chars, including white spaces

Do you want to have another run? Y/N: y

Enter a positive integer: 100

The sum of 1+2+...+100 is: 5050

Enter a sentence: I love programming!

It contains 19 chars, including white spaces

Do you want to have another run? Y/N: n

Program ended with exit code: 0