Explain difference between a pretest and a posttest in a Do/Loop.

PreTest Do/Loop

PostTest Do/Loop

1. Do-while tests the loop condition each time through the loop & it keeps executing while the test expression is a true value.

Loop while we check the condition at the bottom.

2.When the conditional expression is false then

When the loop while is used ,the body of loop

the statements in Do/Loop are skipped.

is executed at least once, since the condition is at the bottom of the loop.

3. General Syntax is :

Do while <condition>

<statements>

Loop General Syntax is

General Syntax is :

Do

<statements>

Loop while<condition>

4. Ex.

Do While intNumber < 100

lblNumber.Caption=intNumber

intNumber = intNumber + 1

Loop

Ex. Dim intNum as integer

Do

Form1.print intNum

intNum = intNum +1

Loop while(intnum <= 10)