Question

imagine that you wanted to write a program that asks the user to enter in 5 grade values. the user may or may not enter valid grades, and you want to ensure that you obtain 5 valid values from the user. which nested loop structure would you use?

Answer 1

In a computer program, loops are used to perform repetitive operations until a condition is met.

The nested loop structure to use in this case is: A "while" loop inside of a "for" loop

The outer loop

First, you must iterate through each student.

This can be done using a for loop or a while loop.

However, it is faster to implement this kind of iteration on a for loop, than a while loop

So, the algorithm of the outer loop would look like the following:

for student = 1 to 5 step 1

The inner loop

Next, you must get input for the 5 grades for each student

After getting input for the grade of each student, a loop would be used to test if the input is valid.

The loop would be repeated until the user enters a valid input.

This can only be done using a while loop.

So, the algorithm of the inner loop would look like the following:

input grade

while grade is invalid:

    input grade

Hence, the nested loop structure to use is:

A "while" loop inside of a "for" loop

Read more about loops at:

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