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arik
5,791 PointsGenerating random number between x and y or generating random number from x to y ?
Mr Dave said to generate random number between x and y, but why the solution include x and y? If it were between shouldn't it excludes x and y, or in other words :
x < random number < y
So the formula should be this..
Math.floor ( Math.random * ( y - x - 1 ) )+ ( x + 1 );
if He uses the formula written in the random.js workspace, it means generating random number from x to y or in other words, x <=random number <= y
Please correct me if I am wrong....
2 Answers
Steven Parker
231,007 PointsProgramming terms sometimes vary from mathematical ones.
From a mathematical perspective you're totally right, the word "between" would mean exclusive of the end points. But in programming "between" can be either exclusive or inclusive; and when not explicitly specified, it's most likely to mean inclusive. In SQL it is an operator keyword, and it is always inclusive.
In the case of the video, the formula shown is inclusive just as you described.
If you think "between" is confusing, in programming a "variable" can be a "constant".
arik
5,791 PointsThank you very much indeed for the answer. I get the point now. If it's not specified it means inclusive.