The while loop uses a Boolean expression to determine when to end the loop: The format of a while loop is:
while <Boolean expression> { <statements>
}
The examples below compares a for and a while Loop. Both examples generate the values 1, 2, 3, 4, 5.
For Loop:
While Loop:
for (int n = 1; n <10; n++) { listBox1.Items.Add(n); }
int n = 0; //initialize the variable while (n <10) { listBox1.Items.Add(n); n++; //increment the variable }
(One advantage of the while loop is that the Boolean expression can include AND and OR.)
Modify the program to generate powers of 2 using the code shown below:
//Programmer: Janet Joy //While loop generates 1,2,4,8,...512 private void Form1_Load(object sender, EventArgs e) { listBox1.Sorted = false; int n = 1; //initialize the variable while (n < 1000) { listBox1.Items.Add(n); n = n * 2; //increment the variable } }
