CS 61C Homework 1-2

Background reading

K&R: Chapters 5.1-5.10.

Administrative requirements

Submit your solution online by 8pm on 27th June 2004. Do this by creating a directory named hw1-2 that contains the file baseconvert.c. From within that directory, type

submit hw1-2

This is not a partnership assignment ; hand in your own work, and don't collaborate with anyone else.

Problem

Write a C program called baseconvert.c that takes three command line arguments: a numeral (may be negative or non-negative), the radix (base 10) used to represent that numeral, and an output radix (also base 10). Your program should print the value represented by the numeral as interpreted in the input radix, translated into the output radix. For example,

command	output	notes
baseconvert 43 8 10	35	43 base 8 = 35 base 10
baseconvert fff 16 10	4095	fff base 16 = 4095 base 10
baseconvert 1001 2 7	12	1001 base 2 = 12 base 7
baseconvert -abx 36 19	-1i1d	-abx base 36 = -1i1d base 19 = -(16859 + 18361 + 1*19 + 13)

Constraints

Input and output radix between 2 and 36 inclusive, using characters '0'-'9', 'a'-'z', and 'A'-'Z'.
There is no need to check the arguments for errors.
Only the library functions printf and putchar can be used.
Only 1 variable, of type unsigned int, may be declared and used anywhere in the program. No other variables, arrays and memory allocations are allowed. Function parameters are not considered to be declarations.
You may assume that the number being converted can fit into 1 unsigned int.
Use the unsigned int to store the number to be converted (this is also a hint).
Any number of pointers, of any type, may be declared and used.