Notes IV

[Sean Kelly]

Oskar Linde wrote:
> bearophile wrote:
> 
>> 16) Against C rules, in some situations I think it may be better if
>> some results are upcasted to ulong/long:
>> import std.stdio;
>> void main() {
>>   uint a = 3_000_000_000;
>>   uint b = 3_000_000_000;
>>   writefln(a + b); // 1705032704
>>
>>   int c = -1_600_000_000;
>>   int d = -1_600_000_000;
>>   writefln(c + d); // 1094967296
>> }
>> (The Ada language uses a different solution to avoid such class of
>> bugs, but it may be too much far from the style of C-like languages.
>> Delphi looks like a compromise).
>>
> 
> On a similar topic, here are two of my favorite bugs:
> 
> 
> // Spot the bug # 1
> double randomDelta() {
>     return (rand() % 3) - 1;
> }
> 
> // spot the bug #2
> void fun(int[] arr) {
>     long d = arr.length - 10;
>     while (d > 0)
>         arr[--d] = 0;
> }
> 

I wonder if this will be resolved by the polysemous value change in 2.0,
whenever that happens?


Sean