Declaration Statement1 - A way to avoid this would be to...

Declaration Statements
Suppose that you have a function to compute factorials (1 x 2 x ... N):
double fact(int n)
{
double f = 1.0;
int i;
for (i = 2; i <= n; i++)
f *= (double)i;
return f;
}
and you need to use this factorial function to initialize a constant in another function,
after doing some preliminary checks on the function parameters to ensure that all are
greater than zero. In C you can approach this a couple of ways. In the first, you would
say:
/* return -1 on error, else 0 */
int f(int a, int b)
{
const double f = fact(25);
if (a <= 0 || b <= 0)
return -1;
/* use f in calculations */
return 0;
}
This approach does an expensive computation each time, even under error conditions.