Java
TOPIC 20 – WHILE LOOPS – PART 2

AP EXTRA – COUNTING ITERATIONS

AP LESSON NOTE

COUNTING ITERATIONS

Many uses of WHILE loops involve the need to count the number of iterations that have occurred in a WHILE loop.

This is done very easily by using the following template:

int count = 0;

while(condition)

{

//do something here

count++;

}

SIMPLE EXAMPLE

In this example, the program continuously asks the user for a positive integer. Once the user enters a negative integer, the looping ends and the total and count is outputted.

int count = 0;

int total = 0;

Scanner scr = new Scanner(System.in);

System.out.println("Enter an integer (Negative to exit.");

int val = scr.nextInt();

while(val >= 0)

{

total = total + val;

System.out.println("Enter an integer (Negative to exit.");

val = scr.nextInt();

count++;

}

System.out.println("The total is " + total);

System.out.println("You entered " + count + " positive numbers.");