What is difference between for loop and while loop?

Answer 1

One first basic rule is that you should use the for loop when the number of iterations is known. For instance:

• The loop iterates over the elements of a collection.
• The loop iterates over a range of values which is known in advance at execution time.
• The object provides a way to iterate over its elements with a for statements (e.g files).

The while loop is the more general one because its loop condition is more flexible and can be more complicated than that of a for loop. The condition of a for loop is always the same and implicit in the construction. A for loop stops if there are no more elements in the collection to treat. For simple traversals or iterations over index ranges it is a good advice to use the for statement because it handles the iteration variable for you, so it is more secure than while where you have to handle the end of the iteration and the change of the iteration variable by yourself.

The while loop can take every boolean expression as condition and permits therefore more complex end conditions. It is also the better choice if the iteration variable does not change evently by the same step or if there are more than one iteration variable. Even if you can handle more than one iteration variable in a for statement, the collections from which to choose the values must have the same number of elements.

Note: In C 'for' and 'while' can be easily replaced by each other:

while (exp) stmt

for (;exp;) stmt

for (exp1;exp2;exp3) stmt

{ exp1; while (exp2) { stmt exp3}}

Answer 2

What kind of loop and a while loop. Please be more specific if you want any chance of the question answered.

answ2. But in general, a For loop will have a numeric value attached, such as For 1 to 10, ..

Whereas a While loop will usually be dependent on some condition, such as While t > 99, Do.. ; or While clock is LT 10.00, Do ..

Answer 3

actually there is no major difference between the two loops. They are both extremely similar in the way they work. The only difference is the way they are coded - syntax wise.

Ex:

for(int i=0; i<10; i++) {

Answer 4

A for loop repeats a set number of times A while loop repeats until a certain value changes'for' statement takes the start condition, stop condition, and the increment.

While loop

'while' statement just takes the stop condition.

if we are using the continue condition before increment or decrement in while loop

the program will go along because after continue statement it can't read any thing

but in the case of for loop it is changed because when the for loop used the program takes all the condition firstly and working on it as initialization and condition and increment or decrement and then generating the result.

Answer 5

A while loop repeats a block while a condition is true. A for loop is syntactic sugar for a certain kind of while loop. That is, a for loop:

for (INIT; COND; STEP) {
STATEMENTS

}

Where INIT is an initial statement (e.g., int i = 0), COND is the loop condition (i < 10), and STEP is the step statement (++i), can be replaced with a while loop:

INIT;
while (COND) {
STATEMENTS;
STEP;

}

Every for loop can be implemented as a while loop, but for loops tend to look nicer for iterating over ranges and containers.

Answer 6

actually there is no major difference between the two loops. They are both extremely similar in the way they work. The only difference is the way they are coded - syntax wise.

Ex:

for(int i=0; i<10; i++) {

…

}

int i = 0;

While(i<10) {

…

i++;

}

Answer 7

Both the for loop and the while loop execute the loop block until a particular condition is satisfied. The for loop is a compressed form of while loop because the loop counter and loop condition are both declared in one line instead of different lines.

ex:

for(int i = 0; i < 10; i++){

...

}

int i = 0;

while (i < 10){

...

i++;

}