Consider the following code that attempts to sum the elements of an array a$,$ where the number of elements is given by parameter length:

float sum$\_$elements$($float a$[],$ unsigned length$)\{$

int i;

float result $=0$;

for $($i $=0$; i length$-1$; i$++)$

result $+=$ a$[$i$]$;

return result;

$\}$

When run with an argument length equal to $0,$ this code should return $0\mathrm{.}0.$ Instead, it encounters a memory error. Explain why this happens. Show how this code can be corrected.