Thread: difference among loops

What do you mean? What sort of loops are we talking about? The four basic loop constructs in C, or something else?

If the former:
for loop: used when you want to get from some value to another value iteratively.
while loop: do something zero or more times.
do-while loop: do something one or more times.
goto: don't use unless you are REALLY sure you have to. [Which is very rare].



--
Mats

Originally Posted by rakeshkumar

wat is difference among loops?
can anybody answer this question?

1.for loop

Code:

for(i=1;i<=5;i++)
printf("FOR");

In for loop first i is initialized to 1 then it is checked against the condition(<=5) and then executes the body, after which it increments i and again checks for the condition and the process is repeated until i equals 6.
2.while loop

Code:

i=1;
while(i<=5)
{
//do something
i++;
}

You can see the difference between the structures of for and while loop. They both generally do the same thing.
3.do while loop
This loop is used if anything is to be done atleast once.

Code:

do
{
//do something
}while(i<=5);

This loop guarantees that the body will be executed at least once while the other two loops (for and while) may not execute the body even once.