usage of_ for loop and while ?

Question

can explain it in example ?

Answer 1

Loops are useful to browse arrays, or to do the same task several times in a row.

var myArray = [100, 100, 80, 56, 42, 21, 49];
for (var i = 0; i < myArray.length; i++) {
//Do something with myArray[i]
}

Equivalent while loop:
i = 0;
while (i < myArray.length) {
//Do something with myArray[i]
i++;
}

In general, when you know how many times you will loop, prefer using a for loop, and use a while loop otherwise.

Answer 2

Okay, there is three parts to a for loop. Which I sometimes refer to as setup, test, update.

I.e for(int I = 0; I < 10 ; I++){

}
The first part initialises the variable, the second part tests that variable against the operand and the third increments the variable "I". Finally I hope I have helped !! and as always I recommend people to browse the reference page for that particular language for further details. Example for JavaScript would be "w3schools"

Answer 3

thanks i understand about while loop , in for lope whats doin 3 parameter in statement ?