CS 3844-Homework #1 Solved

– Binary / Octal / Decimal / Unsigned / Hex


Write a C program that takes one or more numbers on the command line. Rules:

·       If no numbers are given, print a usage message and quit.

·       Do NOT use sscanf or similar. Process each argument one digit at a time.

·       For each number given on the command line, check to see if it is a valid binary, octal, decimal and hex number. For hex numbers, allow both lowercase a-f and uppercase A-F.

·       If there are any invalid characters in the argument, ignore it. E.g., a 2 is not valid for binary.

·       You must also account for a leading minus sign. Additional error checking is not necessary (overflow for example).

Example usage: ./hw1 0 123 abcd -45 error -1 -4D

Example output:

=== Checking 0               Octal      Decimal     Unsigned          Hex

Base  2:                         0            0            0            0

Base  8:                         0            0            0            0

Base 10:                         0            0            0            0

Base 16:                         0            0            0            0

 

=== Checking 123             Octal      Decimal     Unsigned          Hex

Base  8:                       123           83           83           53

Base 10:                       173          123          123           7b

Base 16:                       443          291          291          123

 

=== Checking abcd            Octal      Decimal     Unsigned          Hex

Base 16:                    125715        43981        43981         abcd

 

=== Checking -45             Octal      Decimal     Unsigned          Hex

Base  8:               37777777733          -37   4294967259     ffffffdb

Base 10:               37777777723          -45   4294967251     ffffffd3

Base 16:               37777777673          -69   4294967227     ffffffbb

 

=== Checking error           Octal      Decimal     Unsigned          Hex

 

=== Checking -1              Octal      Decimal     Unsigned          Hex

Base  2:               37777777777           -1   4294967295     ffffffff

Base  8:               37777777777           -1   4294967295     ffffffff

Base 10:               37777777777           -1   4294967295     ffffffff

Base 16:               37777777777           -1   4294967295     ffffffff

 

=== Checking -4D             Octal      Decimal     Unsigned          Hex

Base 16:               37777777663          -77   4294967219     ffffffb3
The columns must line up exactly as shown, but the number of spaces between columns doesn't matter.

Hint: in C, printf with %-10s will left justify a string in 10 characters, %10s will right justify it.