Swedish Exchange paralyzed by buy order for "-6 stocks"

Re:Swedish Exchange paralyzed by buy order for "-6 stocks" by nanex on Thursday November 29, 2012 @06:32AM (#4847177)

Using "unsigned ints" for values that will never be negative allows you to perform one validation test instead of two. Use a typedef to avoid writing "unsigned" everywhere and you end up with less clutter in the code (for humans) and in the binary (for machines).

nanex

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Re:Swedish Exchange paralyzed by buy order for "-6 stocks" by ajuc on Thursday November 29, 2012 @06:57AM (#4847245)

You should check before the operation that can produce result outside the valid range anyway.

Wrong example:

    unsigned int z = x - y;
    if (z > BIG_NUMBER) {
        return false;
    }

Good example:

    if (y > x) {
        return false;
    }
    unsigned int z = x - y;

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