In a simple test, when I try this: var max = Number.MAX_VALUE; var x = max + 10; var min = Number.MIN_VALUE; var y = min / 10; I find that x and max have the same value (in Chrome, IE and Firefox) so it appears that some overflows are just pegged to the max … Read more
Underflow is not only a question of range, but also of precision/rounding. 7.12.1 Treatment of error conditions The result underflows if the magnitude of the mathematical result is so small that the mathematical result cannot be represented, without extraordinary roundoff error, in an object of the specified type. C11 §7.12.1 6 1.777e-308, converted to the … Read more
To check for over/underflow in arithmetic check the result compared to the original values. uint32 a,b; //assign values uint32 result = a + b; if (result < a) { //Overflow } For your specific the check would be: if (a > (c-b)) { //Underflow }
§6.2.5, paragraph 9: A computation involving unsigned operands can never overflow, because a result that cannot be represented by the resulting unsigned integer type is reduced modulo the number that is one greater than the largest value that can be represented by the resulting type. Edit: Sorry, wrong reference, but the result is still pinned … Read more