Please help me with these c++ programs:

2. Write a program that increments a given number by a given value. a) Main should handle all input and output b) Create a void function that i ncrement s a specified number by a specified value. c) Demonstrate the function with sample input from console. Example Output (input in bold italics) Enter a number: 5 Enter a value to increment by: 3 The incremented value is 8. 3. Write a program that calculates n factorial (n!). a) Main should handle all input and output b) Create a function that accepts a number n and returns n factorial. c) Demonstrate the function with sample input from console. n!n * n-1 * n-2 * n-3, for all n >0 For example, 3!-3 * 216 Example Output (input in bold italics) Enter a number: 5 5' = 120