Problems
Computers internally use only the digits 0 and 1 to operate all programs.
A number composed of only these two digits is called a binary number.
Write a program that, given a binary number as input, converts it to a decimal number and prints the result.
Input
A binary number of at most 30 digits, consisting only of 0s and 1s.
Output
Print the decimal equivalent of the input binary number.
Example #1
10101
21
Example #2
111111111111111111111111111111
1073741823
Tag
Source
jungol
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