What is meant by this statement?

Question

If you don't know exactly how many times you'll want the loop to iterate, use a while or do-while loop. The main issue is deciding whether to test at the beginning or the end of the loop.

I thought the loop test was always in front of any other procedure or input in the loop?

Answer 1

If you want the conditional code to execute the first time no matter what then you should do the test at the end.

Answer 2

You can put a test condition at the bottom of the loop thusly:

bool exit = false;

while(!exit)
{
// do something here....

//put in a test condition here...
if(testcondition == true)
exit = true;
}

Notice that the loop processing takes place before you test for the exit condition.

}

Answer 3

a while loop checks the condition before going into a loop

i.e.
foo=true;
while (foo== true){
//do stuff that eventually changes foo
}

a do while loop runs through the loop once, then checks the condition.

foo=false;
do{
//do stuff, maybe change foo
}while(foo==true);

this second will always run the first time, then if foo is still false will stop.

Answer 4

mainly loops are of 2 types. in the case of 'for' loop, it checks the codition first, then executes the codes. in second type, the codes get executed first, after that it checks the condition.