Need help please

[Paulol]

Resolved, thanks.

[shadowCODE]

void convert(double *);  //prototype 

void convert(double *a)
{
	*a = *a * 2.54;
}

From line 13, it tells that measurement is passed by reference to the function and hence will be modified.
Line 15 prints the new value of measurment which hints that convert returns void