Difference between While loop and For loop. Where we need to While/For?

Prashantkumar D

14y4.4kVisual Basic .NET

Difference between While loop and For loop. Where we need to use While/For?
Please explain with example

6 Replies

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Prashantkumar D14y ago
Thanks Achutha
Prashantkumar D14y ago
Thanks Santhosh
Prashantkumar D14y ago
Thanks.
Vulpes14y ago
Broadly, you'd use a for statement where you want to loop for a fixed number of times. For example:

for(int i = 0; i < 10; i++) // loops exactly 10 times
{
Console.WriteLine(i);
}

and, you'd use a while statement where you want to loop whilst some condition is true:

int i = 0;
while (i < 10)
{
Console.WriteLine(i);
i++;
}

However, as you can see, the two statements are interchangeable - what you can do with one you can do with the other as the above examples show.

So it's just a matter of which is the more convenient (or even personal taste) for a given scenario.
R ACHUTHA14y ago
The main difference comes into picture when you use continue with them i.e. for and while.
In a while loop if continue is used before the increment of a variable is done it converts into a infinite loop.
i=1;
while(i<10)
{
/* do stuff */
if(i==6);
continue;
i++;
}
The above piece of code will turn into an infinite loop.
for(i=1;i<10;i++)
{
/* do stuff */
if(i==6);
continue;
}

In the above for loop the value of will be incremented once it attains the value 6.
Therefore it will not turn into a infinite loop.
Santhosh Kumar Jayaraman14y ago
As far as i know,
only difference is before using variable in while loop condtion, you need to declare it before but with for its not required. You can declare in for loop also.

While( int i=1>0)
{
}

The above is not possible. We have to declare i earlier and should assign some value
int i=2;

while(i<5)
{
}

but for (int i=1;i>0;i++)
{
}

This is allowed