What are three common ways that the value of a loop control variable is changed during the loop's execution?

What will be an ideal response?

Within a correctly functioning loop's body, you can change the value of the loop control variable in a number of ways. Many loop control variable values are altered by incrementing, or adding to them. Other loops are controlled by reducing, or decrementing, a variable and testing whether the value remains greater than some benchmark value. Such a loop, for which the number of iterations is predetermined, is called a definite loop or counted loop. Often, the value of a loop control variable is not altered by arithmetic, but instead is altered by user input. For example, perhaps you want to continue performing some task while the user indicates a desire to continue. In that case, you do not know when you write the program whether the loop will be executed two times, 200 times, or not at all. This type of loop is an indefinite loop.