What is the difference between Repeat until and while?

What is the difference between Repeat until and while?

REPEAT UNTIL loops The UNTIL statement tests the condition and declares the end of the statement scope. Because the condition is tested at the end, the code within the loop is always executed at least once, even if the result of the test is FALSE. With a WHILE loop, the code within the iteration may never be executed.

What is the meaning of repeat until?

The repeat / until loop is a loop that executes a block of statements repeatedly, until a given condition evaluates to true . The condition will be re-evaluated at the end of each iteration of the loop, allowing code inside the loop to affect the condition in order to terminate it.

How do you repeat a while statement?

repeat… while Loop

1. The body of the loop is executed at first. Then condition is evaluated.
2. If condition evaluates to true , the body of the loop inside the repeat statement is executed again.
3. condition is evaluated once again.
4. This process continues until condition evaluates to false . Then the loop stops.

How do you change a for loop to a while loop?

To convert a for loop to while loop we need to simply add the initialization statement before the while loop.

1. /* For loop */ int i; for(i = 0; i < 10; i++) { }
2. /* While loop */ while(*str++ != NULL) { length++;
3. /* Do while loop */ do. { status = check_connection();
4. /* For loop */ int i; for(i = 0; i < 10; i++) {

How do you repeat until in Pascal?

Sn; until condition; For example, repeat sum := sum + number; number := number – 2; until number = 0; Notice that the conditional expression appears at the end of the loop, so the statement(s) in the loop execute once before the condition is tested.

What is the uses of repeat until?

REPEAT… UNIL loops are used to repetitively execute a subject statement until a condition is true. The condition is checked after the subject statement is executed.

How do you repeat until Pascal?

For example, repeat sum := sum + number; number := number – 2; until number = 0; Notice that the conditional expression appears at the end of the loop, so the statement(s) in the loop execute once before the condition is tested.

When can you use a for each loop?

A for-each loop is a loop that can only be used on a collection of items. It will loop through the collection and each time through the loop it will use the next item from the collection. It starts with the first item in the array (the one at index 0) and continues through in order to the last item in the array.