Convert given decimal number to binary number.
Example x=10, then answer must be 1010.
Why doesn't the built in function dec2bin() work here?
dec2bin returns a character vector, the answer must be an int type
Implement a ROT13 cipher
Swap the input arguments
Return the first and last character of a string
Change the first and last diagonal element of the identity matrix to zero
Find out total non zero element of matrix
Convert number from given base to other base
Find the mode of the given input
Check that number is whole number
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