Develop a C++ program that teaches elementary school students multiplication. Use rand to produce two positive one-digit integers. It should then type a question such as:
How much is 6 times 7?
The student then types the answer. Your program checks the answer; if it is correct, the correctMessage function is called; if it is incorrect, the incorrectMessage function is called. Your program will count the number of correct and incorrect answers. After 10 answers (any/all answers count), the program will calculate the percentage of correct responses. If the percentage is lower than 75%, your program will call the needHelp function, then terminate. Otherwise, the program continues until the student enters the sentinel value (-1) to end the program.