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Challenge

What do computers understand? That's right, binary. All files are turned into binary digits when you run them, but what if I suggest giving you an int then turn it into it's binary value.

• Take input of a non-negative decimal integer and output its binary value/form.
• Any preceding zeros don't need to be outputted.
• Suggested by @celtschk: Converters that simply take the inputted number as binary without changing the input itself aren't allowed. (Won't be in the final draft)
• Adding to the disallowed converters, any built-in method that formats the variable as binary without actual conversion like Python's 0b are also not allowed. The focus is to take input, make a converter, then output the result. (Won't be in the final draft)
• This is code-golf, so the shortest program wins. Yep, not by language.

Test Cases

n = 0
Output: 0

n = 1
Output: 1

n = 5
Output: 101

n = 12
Output: 1100

n = 31
Output: 11111

n = 4096
Output: 1000000000000

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Specify decimal base (1 comment)
This is not encryption (1 comment)