What is the point of while loops?

The while loop is used to repeat a section of code an unknown number of times until a specific condition is met. For example, say we want to know how many times a given number can be divided by 2 before it is less than or equal to 1.

When should you use a while loop over a for loop?

In general, you should use a for loop when you know how many times the loop should run. If you want the loop to break based on a condition other than the number of times it runs, you should use a while loop.

Is for loop same as while loop?

The difference between for loop and while loop is that in for loop the number of iterations to be done is already known and is used to obtain a certain result whereas in while loop the command runs until a certain condition is reached and the statement is proved to be false.

Can I put a while loop in a for loop?

It can contain the for loop inside a for loop or a while loop inside a while loop. It is also possible that a while loop can contain the for loop and vice-versa.

Do while loop vs while loop?

Here, the main difference between a while loop and do while loop is that while loop check condition before iteration of the loop. On the other hand, the do-while loop verifies the condition after the execution of the statements inside the loop. Conversely, the do while loop is called the exit controlled loop.

What is the difference between while loop and do while loop explain with example?

While the loop is an entry control loop because firstly, the condition is checked, then the loop’s body is executed. The do-while loop is an exit control loop because in this, first of all, the body of the loop is executed then the condition is checked true or false.

What is the difference between while do-while and for loop?

A while loop in C programming repeatedly executes a target statement as long as a given condition is true. The syntax is like below….Output.

Why for loop is better than while loop?

for loop: for loop provides a concise way of writing the loop structure. Unlike a while loop, a for statement consumes the initialization, condition and increment/decrement in one line thereby providing a shorter, easy to debug structure of looping.

What is the difference between while do while and for loop?

How do you choose between while and for loop?

Use a for loop when you know the loop should execute n times. Use a while loop for reading a file into a variable. Use a while loop when asking for user input. Use a while loop when the increment value is nonstandard.

Can we use while inside for loop?

A final note on loop nesting is that you can put any type of loop inside any other type of loop. For example, a ‘for’ loop can be inside a ‘while’ loop or vice versa.

Do while and while loop is same true or false?

Explanation: do-while loop is exit controlled loop whereas while loopis an entry controlled loop.

When does the while loop execute?

Hence, it executes once all statements in loop have been executed. The initialization and the condition checking is done at the beginning of the loop. It is used only when the number of iterations isn’t known. If the condition is not mentioned in the ‘while’ loop, it results in a compilation error.

What is the difference between an IF statement and a while loop?

Instead of running the code block once, It executes the code block multiple times until a certain condition is met. While loop does the exactly same thing what “if statement” does, but instead of running the code block once, they jump back to the point where it began the code and repeats the whole process again.

What is the use of while loop in PostgreSQL?

The PostgreSQL WHILE LOOP is used when we want to execute the same block of code statements several times. This continues execution of WHILE LOOP body until a condition defined in the WHILE LOOP evaluates to false.

What happens if the condition is not mentioned in the loop?

If the condition is not mentioned in the ‘while’ loop, it results in a compilation error. If the initialization is done when the condition is being checked, then initialization occurs every time the loop is iterated through. The iteration statement can be written within any point inside the loop.