Q4: Write a C++ program, using function, to see if a number is an integer (odd or even) or not an integer. Q5: Write a C++ program, using function, to represent the permutation of n. Q6: Write a C++...

I want solutions using functions

Extracted text: Q4: Write a C++ program, using function, to see if a number is an integer (odd or even) or not an integer. Q5: Write a C++ program, using function, to represent the permutation of n. Q6: Write a C++ program, using function, to inputs a student's average and returns 4 if student's average is 90-100, 3 if the average is 80-89, 2 if the average is 70-79, 1 if the average is 60-69, and 0 if the average is lower than 60.