C++ programming language

Write Function Definitions for each task described below. Then... Write a program that calls each function to demonstrate your solutions.

1. Write a function that returns an integer and accepts a pointer to a C-string as an argument. The function should count the number of characters in the string and return that number. Demonstrate the function in a simple program that asks the user to input a string, passes it to the function, and then displays the functions return value.

2. Write a function that accepts a pointer to a C-string as an argument and displays its contents backward. For instance, if the string argument is Gravity the function should display ytivarG . Demonstrate the function in a program that asks the user to input a string and then passes it to the function.

3. Write a function that accepts a pointer to a C-string as an argument and returns the number of words contained in the string. For instance, if the string argument is Four score and seven years ago the function should return the number 6. Demonstrate the function in a program that asks the user to input a string and then passes it to the function. The number of words in the string should be displayed on the screen.

4. Write a program that asks the user to enter a series of single digit numbers with nothing separating them. Read the input as a C-string or a string object. The program should display the sum of all the single-digit numbers in the string. For example, if the user enters 2514, the program should display 12, which is the sum of 2, 5, 1, and 4.