# Denary to Binary Conversion Algorithm

In this challenge, we are going to write al algorithm to convert a decimal (aka Denary) number between 0 and 255 into binary using 1 Byte (=8 bits).

Before attempting this challenge you may practise your denary to binary conversion:

#### Python Challenge

We are now going to use some Python code to implement al algorithm to convert a denary number into binary. To do so, you will need to complete the following 4 tasks.

Python Challenge - Task #1Task #2: Input ValidationTask #3: Writing a FunctionTask #4: Binary to Denary

#### Python Challenge: Task #1

We have started an algorithm which we would like you to complete to perform a full denary to binary conversion.

Your first challenge is to investigate the code below to see what it does and how it works. You will then need to complete this code to make sure that it outputs a fully Byte of data for any given number between 0 and 255.

The following trace table may help you investigate this code step by step:

Line NumberdenarybinaryOUTPUT
3

#### Python Challenge: Task #2

Add some code to your code from task 1 to validate the input so that your code only accepts a number between 0 and 255. You can find out more about different validation techniques below and select the validation technique that is most relevant to this task:

#### Validation Techniques:

##### Input Validation: Presence Check

```name = input("Enter your name:").strip()

if name=="":
print("Empty name!")
else:
print("Thank you!")
```

##### Input Validation: Type Check – Integer?

```number = input("Type a number:")

if number.isdigit():
print("This is a number")
else:
print("This is not a whole number")
```

##### Input Validation: Range Check

```number = int(input("Type a number between 1 and 5:"))

if number>=1 and number<=5:
print("Valid number")
else:
print("Invalid number")
```

##### Input Validation: Lookup Check

```drive = input("Can you drive?").lower()

if drive in ["yes","no"]:
else:
```

##### Input Validation: Character Check

```email = input("Type your e-mail address:")

if "@" in email:
else:
```
```postcode = input("Type your postocode:").upper()

if postcode[0] in "ABCDEFGHIJKLMNOPQRSTUVWXYZ" and postcode[1] in "ABCDEFGHIJKLMNOPQRSTUVWXYZ" and postcode[2] in "123456789":
print("Valid postcode")
else:
print("Invalid postcode")
```

##### Input Validation: Length Check

```password = input("Type a password:")

else:
```

##### Try Again! Using a While Loop:

```name = input("Enter your name:")

while name=="":
print("You must enter your name! Please try again!")
name = input("Enter your name:")

print("Welcome " +  name)
```

#### Task #3: Writing a Function

Turn your code into a function called convertToBinary(). Your function will take a denary number as a parameter and return a binary string. You will then need to add some code to test your function.​

#### Task #4: Writing a Function

Create a new function called convertToDenary(). This new function will take a binary string as a parameter and return the matching denary value.

#### Solution...

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