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## Can you do nested for loops in Java?

We can also create nested loops with while and do… while in a similar way. Note: It is possible to use one type of loop inside the body of another loop. For example, we can put a for loop inside the while loop.

## Can for loops be nested?

Since the code block of a loop can include any legal C++ statements, you can place a loop inside of a loop. The inner loop is nested inside the outer loop. Nested loops are useful when for each pass through the outer loop, you need to repeat some action on the data in the outer loop.

Is nested for loop always O N 2?

“Are nested for-loops always O(n^2)?” To your other question, the answer is no. They aren’t always O(n^2) . You can easily create a situation where one of the loops affects the iterations of the other, yielding a different complexity.

### How do two nested for loops work?

When a loop is nested inside another loop, the inner loop runs many times inside the outer loop. In each iteration of the outer loop, the inner loop will be re-started. The inner loop must finish all of its iterations before the outer loop can continue to its next iteration.

### What is the difference between for loop and nested for loop?

The loop which contains a loop inside a loop is known as the nested 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.

What is nesting of for loop?

A nested loop has one loop inside of another. These are typically used for working with two dimensions such as printing stars in rows and columns as shown below. When a loop is nested inside another loop, the inner loop runs many times inside the outer loop.

#### How do you avoid nested for loops?

There is also a way to avoid nested loops by itertools. product() . You can use itertools. product() to get all combinations of multiple lists in one loop, and you can get the same result as nested loops.

#### Are nested for loops slow?

Nested loops can get difficult to understand relatively quickly, though some nesting of loops is fine – providing, as others point out, that doesn’t mean you’re creating a performance issue by using an extremely (and unnecessarily) slow algorithm.

What is the complexity of nested for loop?

Every time the outer loop executes, the inner loop executes M times. As a result, the statements in the inner loop execute a total of N * M times. Thus, the total complexity for the two loops is O(N2).

## Can you nest a for loop in an if statement?

You can nest If statements inside For Loops. For example you can loop through a list to check if the elements meet certain conditions. You can also have a For Loop inside another For loop.