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57 lines
No EOL
1.3 KiB
Markdown
# Binary
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Welcome to Binary on Exercism's C Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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## Instructions
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Convert a binary number, represented as a string (e.g. '101010'), to its decimal equivalent using first principles.
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Implement binary to decimal conversion.
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Given a binary input string, your program should produce a decimal output.
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The program should handle invalid inputs.
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## Note
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- Implement the conversion yourself.
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Do not use something else to perform the conversion for you.
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## About Binary (Base-2)
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Decimal is a base-10 system.
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A number 23 in base 10 notation can be understood as a linear combination of powers of 10:
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- The rightmost digit gets multiplied by 10^0 = 1
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- The next number gets multiplied by 10^1 = 10
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- ...
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- The *n*th number gets multiplied by 10^*(n-1)*.
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- All these values are summed.
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So: `23 => 2*10^1 + 3*10^0 => 2*10 + 3*1 = 23 base 10`
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Binary is similar, but uses powers of 2 rather than powers of 10.
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So: `101 => 1*2^2 + 0*2^1 + 1*2^0 => 1*4 + 0*2 + 1*1 => 4 + 1 => 5 base 10`.
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## Source
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### Created by
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- @antony-jr
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### Contributed to by
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- @bcc32
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- @deathsec
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- @Gamecock
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- @h-3-0
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- @patricksjackson
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- @QLaille
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- @RealBarrettBrown
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- @ryanplusplus
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- @wolf99
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### Based on
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All of Computer Science - https://www.wolframalpha.com/examples/mathematics/numbers/base-conversions |