bconv – Byte conversions – Computer Science by Example

bconv – Byte conversions

Write a program that is able to convert between bits, bytes and any of their multiples: bits, bytes, kilobits, kilobytes, megabits, megabytes, gigabits, gigabytes, terabits, terabytes, kibibits, kibibytes, mebibits, mebibytes, gibibits, gibibytes, tebibits and tebibytes. Use the decimal scale (1000) for kilo, mega, giga and tera and the binary scale (1024) for kibi, mebi, gibi and tebi.

Input and output

Each line of input is given in the format <n> <unit1> in <unit2>. Units are given by their full names: kilobits, kilobytes, kibibits, kibibytes, etc. Units may be given in singular or plural form. Input is no larger than 1024 tebibytes.

For each line of input there should be a line of output with the corresponding result. The result should be rounded to the nearest integer. Output should be in singular or plural according to the result.

Example input

1 kilobyte in bits
2 kilobits in bytes
128 mebibytes in megabytes
56 kilobits in kilobytes

Example output

8000 bits
250 bytes
134 megabytes
7 kilobytes

Scoring

1/12: works for the above examples but produces output in an incorrect format
2/12: works for the above examples and produces output in the correct format
4/12: performs small scale byte conversions
6/12: performs small scale bit conversions
8/12: performs small scale bit/byte conversions
10/12: uses singular and plural correctly
11/12: works for up to 1024 tebibytes
12/12: rounds correctly

Hints

In the test system, a long long C type is guaranteed to be at least 8 bytes / 64 bits. In the test system, the Int Haskell type is guaranteed to be at least 8 bytes / 64 bits.

try first: bytes2bits bits2bytes kilobytes

try next: file-size hconv

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