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Copy file name to clipboardExpand all lines: Content/Chapter-7-1-complex-loops/loop-step/loop-step.md
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Test your solution here: [https://judge.softuni.org/Contests/Practice/Index/514\#0](https://judge.softuni.org/Contests/Practice/Index/514#0).
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## Example: Numbers N...1 in Reverse Order
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Write a program that prints the numbers from **n to 1 in reverse order**\(step of -1\). For example, **if n = 100**, the result will be: **100, 99, 98, …, 3, 2, 1**.
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We can solve the problem in the following way:
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* We read the number `n` from the console input.
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* We create a `for`** loop** by assigning `int i = n`.
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* We reverse the condition of the loop: `i >= 1`.
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* We define the size of the step: **-1**.
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* In **the body of the loop**, we print the value of the current step.
Watch this video lesson to learn how to print the numbers from N down to 1 \(in reverse order\) using a for loop: [https://youtu.be/LGPZ-ug3qh0](https://youtu.be/LGPZ-ug3qh0).
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### Testing in the Judge System
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Test your solution here: [https://judge.softuni.org/Contests/Practice/Index/514\#1](https://judge.softuni.org/Contests/Practice/Index/514#1).
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## Example: Numbers from 1 to 2^n with a For Loop
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In the following example, we will look at using the usual step with size of 1, combined with a calculation at each loop iteration.
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Write a program that prints the numbers from **1 to 2^n**\(two in power of n\). For example, **if n = 10**, the result will be: **1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024**.
Watch this video lesson to learn how to iterate over the number from 1 to 2^n using a for-loop: [https://youtu.be/B2k\_yx3EV0I](https://youtu.be/B2k_yx3EV0I).
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### Testing in the Judge System
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Test your solution here: [https://judge.softuni.org/Contests/Practice/Index/514\#2](https://judge.softuni.org/Contests/Practice/Index/514#2).
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## Example: Even Powers of 2
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Print **the even** powers of **2** to **2^n**: **2^0, 2^2, 2^4, 2^8, …, 2^n**. For example, if **n = 10**, the result will be: **1, 4, 16, 64, 256, 1024**.
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Here is how we can solve the problem:
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* We create a `num` variable for the current number to which we assign an initial **value of 1**.
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* For **a step** of the loop, we set a value of **2**.
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* In **the body of the loop**: we print the value of the current number and **increase the current number **`num`** 4 times**\(according to the problem's description\).
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### Video: Even Powers of 2
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Watch this lesson to learn how to print the even powers of 2 using a for loop: https://youtu.be/H8t4HGn\_Ap4.
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### Testing in the Judge System
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Test your solution here: [https://judge.softuni.org/Contests/Practice/Index/514\#3](https://judge.softuni.org/Contests/Practice/Index/514#3).
Print **the even** powers of **2** to **2^n**: **2^0, 2^2, 2^4, 2^8, …, 2^n**. For example, if **n = 10**, the result will be: **1, 4, 16, 64, 256, 1024**.
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## Video: Even Powers of 2
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Watch this lesson to learn how to print the even powers of 2 using a for loop: [https://youtu.be/H8t4HGn\_Ap4](https://youtu.be/H8t4HGn_Ap4).
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## Hints and Guidelines
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Here is how we can solve the problem using a **for-loop with a step**:
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* We create a `num` variable for the current number to which we assign an initial **value of 1**.
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* For **a step** of the loop, we set a value of **2**.
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* In **the body of the loop**: we print the value of the current number and **increase the current number **`num`** 4 times**\(according to the problem's description\).
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## Testing in the Judge System
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Test your solution here: [https://judge.softuni.org/Contests/Practice/Index/514\#3](https://judge.softuni.org/Contests/Practice/Index/514#3).
In the following example, we will look at using the usual step with size of 1, combined with a calculation at each loop iteration.
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Write a program that prints the numbers from **1 to 2^n**\(two in power of n\). For example, **if n = 10**, the result will be: **1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024**.
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## Video: Numbers 1 ... 2^n
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Watch this video lesson to learn how to iterate over the number from 1 to 2^n using a for-loop: [https://youtu.be/B2k\_yx3EV0I](https://youtu.be/B2k_yx3EV0I).
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## Hints and Guidelines
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The code below demonstrates how we can **calculate the powers of 2** for given **n** using a for-loop with a calculation at the end of its body:
Write a program that prints the numbers from **n to 1 in reverse order**\(step of -1\). For example, **if n = 100**, the result will be: **100, 99, 98, …, 3, 2, 1**.
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## Video: Numbers N...1
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Watch this video lesson to learn how to print the numbers from N down to 1 \(in reverse order\) using a for loop: [https://youtu.be/LGPZ-ug3qh0](https://youtu.be/LGPZ-ug3qh0).
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## Hints and Guidelines
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We can solve the problem in the following way:
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* We read the number `n` from the console input.
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* We create a `for`** loop** by assigning `int i = n`.
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* We reverse the condition of the loop: `i >= 1`.
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* We define the size of the step: **-1**.
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* In **the body of the loop**, we print the value of the current step.
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