Learning Julia

Understanding overflow behavior

In Julia, we don’t have type declarations that are applicable on a global scope. But we can definitely use them in the scope local to a function.

In the following example, we will define a function that has an x variable of the Int16 type. We are assigning it a value of 10000 (we will learn about functions and types in detail in the coming chapters):

julia> x = Int16(10000)10000julia> x*x-7936

This function is very straightforward. It assigns the value of 10000 to x of type Int16 and prints x*x.

Why do we get x*x, which is 10000*10000 as -7936?

This is because we exceeded the value that the type of the variable can handle. This resulted in a wraparound behavior. The wraparound behavior is part of the modular ...