I need help with these 3 c++ programming questions. My professor told me to use 'if else statement' 'switch statement' or for loop if needed.

no remainder. That is, is it evenly divisible by 3,7,13, or any other user-specified value? 6-As a part-time student, you took two courses last term. Write, run, and test s C++ program that calculates and display your grade point average (GPA) for the term. Your program should prompt the user to enter the grade and credit hours for each course. This information should then be displayed with the lowest grade first, and the GPA for the term should be calculated and displayed. A warning message should be printed if the GPA is less than 2.0 and a congratulation message if the GPA is 3.5 or above. 7-Write and run a program that reads a six-digit integer and prints the sum of its six digits. Use the quotient operator / and the remainder operator % to extract the digits from the integer. For example, if n is the integer 876,543, then n/1000%10 is its thousands digit 6. 8-Write and test a program that solves quadratic equations. A quadratic equation is an equation of the form ax?+ bx+c -0, where a.b, and c are given coefficient and x is the unknown. The coefficient are real numbers inputs, so they should be declared of the type float or double. Since quadratic equations typically have two solutions, use x1 and x2 for the solutions to be output. These should be declared type double to avoid inaccuracies from round off error