Java 6 Illuminated: An Active Learning Approach, 2nd Edition

6.11 Nested Loops 349

for factor = 2 to ( number / 2 ) by 1

{

if number % factor is 0

{

print factor and a space

set flag to true

}

}

if flag is false

print “number is prime”

print a new line

read next number // update read

}

Since we want to read positive numbers only, the lines “read first number”

and “read next number” in the preceding pseudocode will actually be more

complex than a simple statement. Indeed, we will prompt the user to enter a

positive number until the user does so. In order to do that, we will use a

do/while loop to validate the input from the user. Therefore, inside the while

loop, we nest not only a for loop, but also a do/while loop. In ...