Error Handling 4
- Returning a value is similar, but to extract the value we need to make a test. Let’s first look at a simple function illustrating the use.
- Both
divide_int(4, 2) and divide_int(4, 0) would give us an int? result, so how do we decide what we got? We use if-catch or if-try.
import std::io;
faultdef DIVISION_BY_ZERO;
fn int? divide_int(int x, int y)
{
if (!y) return DIVISION_BY_ZERO~;
return x / y;
}
fn void main()
{
int a = 4;
int b = 2;
if (try div = divide_int(a, b))
{
// This code will only be run if b != 0
io::printfn("b is not zero");
}
}
