Modulo operation is something we all aware of from long time and this , infact brings out an interesting perspective on how Microsoft and Google has implemented it. Try out finding the result for following operation in C# or VB or even Windows Calculator.
"-5 mod 6"
Your result was -5 right ??? Now attempt the same in Google Calculator ?? -1 the result ??
Which is correct ? Its going to be an interesting argument. The Modulo function is definaed as the amount by which a number exceeds the largest integer multiple of the divisor that is not greater than that number.
Now if you go by that defination , - 5 * -1 would yield 5 with a remaining -1. That would explain the answer given by Google. But Microsoft's answer too can be argued.
The normal formula to calculate Mod is given by r = a - n(a/n). Now assuming Microsoft calculates this using r = a - n * abs(a/n) , then answer given by Calculator is correct.
Counter argument exists in both cases and hence it is argueable on sides of both parties about which is the correct solution.
Saturday, May 31, 2008
Modulo Operation : Microsoft vs Google
Category
Techie Tips