# Write a recursive function that computes the sum of all numbers from 1 to n

Now let us imagine that our function actually works. If it works we can use it to give the result of more complex cases. So we actaully have the exact answer for all cases in the top level recursion. For the moment we should remember that before proceeding with recursive implementation we should think about an iterative variant, after which we should choose the better solution according to the situation.

This time we are going to consider an iterative solution, too. Simulation of N Nested Loops Very often we have to write nested loops. It is very easy when they are two, three or any number previously assigned. However, if their count is not known in advance, we have to think of an alternative approach.

This is the case with the following task. Write a program that simulates the execution of N nested loops from 1 to K, where N and K are entered by the user.

The result of the performance of the program should be equivalent to the execution of following fragment: Each row of the result can be regarded as ordered sequence of N numbers.

The first one represents the current value of the counter of the loop, the second one — of the second loop, etc. On each position we can have value between 1 and K. The solution of our task boils down to finding all ordered sequences of N elements for N and K given.

Nested Loops — Recursive Version If we are looking for a recursive solution to the problem, the first problem we are going to face is finding a recurrent dependence.

We can check that this rule applies for numbers greater than 3. This way we have obtained the following dependence — starting from the first position, we put on the current position each of the values from 1 to K and continue recursively with the next position.

This goes on until we reach position N, after which we print the obtained result bottom of the recursion. Here is how the method looks implemented in C:Python Exercises, Practice and Solution: Write a Python function to sum all the numbers in a list.

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## C program to print even numbers from 1 to N using while loop

Write a Python function to find the Max of three numbers. Go to the editor Click me to see the sample solution. 2. Write a Python function to sum all the numbers in a list.

Go to the editor Sample List: (8, 2, 3, 0, 7) Expected Output: Write a function that takes in a number n and returns a function that takes in a number range which will print all numbers from 0 to range (including 0 but excluding range) but print Buzz!

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