A$0$: Base to Decimal

Learning Outcomes

$-----------------$

$1.**$Explain$**$ the difference between characters and numbers on a computer.

$2.**$Use$**$ an array as a lookup table to check for character equality.

$3.**$Use$**$ an algorithm to translate a number from a different base to decimal.

$4.**$Develop$**$ a program that $**$utilizes$**$ this algorithm.

Specifications

$--------------$

For this assignment you will write a program that can convert numbers written in bases $2$ to $16$ into their decimal equivalents. The numbers will be prefixed with $`0$b$`,`0$q$`,`0$s$`,`0$n$`,`0$z$`$ and $`0$x$`,$ for example, indicting which base the given input is in$.$

There's no need to write any code outside of lines $20-27$ inside $`$main$()`$ and the $`$chars$\_$to$\_$int$()`$ function. $//$ this is a pre$-$processor directive

#include

$//$ this is a function prototype

int chars$\_$to$\_$int$($char$*,$ int$)$;

const char $*$bases $="\_\_$btqpshondlzrfyx";

$//$ this is the main function

int main$($int argc, char $**$argv$)\{$

$//$ output usage if incorrect number of command line

$//$ arguments were given

if $($argc $!=2)\{$

printf$("$usage: $\%$s $0[$btqpshondlzrfyx$]$

$",$ argv$[0])$;

return $-1$;

$\}$

$//`$chars$`$ is an array of characters

char $*$chars $=$ argv$[1]$;

$//$ TODO: call $`$chars$\_$to$\_$int$()`$ with correct arguments

$//$ TODO: output an error if $`$chars$\_$to$\_$int$`$

$//$ encountered an error

$//$ print the result

printf$("\%$d

$",0)$;

$//$ exit succefully

return $0$;

$\}$

int chars$\_$to$\_$int$($char $*$chars$,$ int base$)\{$

$//$ TODO: implement this function to translate

$//$ an array of characters to a decimal number

$//$ TODO: return the result

return $0$;

$\}$