Exercise $2$: Code testing

The source code in Figure $1$ is a C implementation of an algorithm that takes a positive integer as

input and returns an integer.

int discover$($ int number$)$

$\{$

int i $=0,$ j$,$digits$[10]$;

while$($number$>=10)$

$\{$

digits$[$i$++]=$number$\%10$;

number $/=10$;

$\}$

digits$[$i$]=$number;

number$=0$;

for$($j$=0$;ji;j$++)$

$\{$

number $=$number$*10+$digits$[$j$]$;

$\}$

return number;

$\}$

$($a$)$ For number $=5481,$ what will Discover

return. In general, what does the function

Discover do$.$

$($b$)$ Draw a flowchart$($ control$-$flow graph $)$

the code given in Figure $1$

$($c$)$ Propose test cases that achieve branch

coverage.

$($d$)$ Propose test cases that achieve statement

coverage.