difference between while and do while loop

DIFFERENCES BETWEEN WHILE AND DO-WHILE LOOP:

1.       In While loop the condition is
tested first and then the statements are executed if the condition turns out to
be true.
In do while the statements are executed for the first time and then the conditions
are tested, if the condition turns out to be true then the statements are
executed again.

2. A do while is used for a block
of code that must be executed at least once.
These situations tend to be relatively rare, thus the simple while is more commonly
used.
    3. A do while loop runs at least once
     even though the the condition given is false
     while loop do not run in case the condition given is false



     4. In a while loop the condition is
    first tested and if it returns true then it goes in the loop
                     In a do-while loop the condition is
                      tested at the last.



5. While loop is entry control loop
where as do while is exit control loop.



6. Syntax:

 while loop  :
while (condition)
{
Statements;
}
do while loop  :
Do
{
Statements;
}while(condition)

The do while loop executes the content of the loop once before checking the condition of the while. Whereas a while loop will check the condition first before executing the content.

The while loop checks whether the  test expression is true or not. If it is true, code/s inside the body of while loop is executed,that is, code/s inside the braces { } are executed. Then again the test expression is checked whether test expression is true or not. This process continues until the test expression becomes false.

In C, do...while loop is very similar to while loop. Only difference between these two loops is that, in while loops, test expression is checked at first but, in do...while loop code is executed at first then the condition is checked. So, the code are executed at least once in do...while