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Message: [QUOTE="Walter Roberson, post: 2507810"] && binds more tightly than ||, so the test is equivilent to (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) However, it is relatively common for people to mistakenly think of && and || as having the same precedences, and so it is common for people to read the operators from left to right. It doesn't make a difference in this particular case, but if you had written, if (year % 400 == 0 || year % 4 == 0 && year % 100 != 0) then people would tend to (mistakenly) read this as if ((year % 400 == 0 || year % 4 == 0) && year % 100 != 0) when really it is if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)) The warning is altering you to the possibility of the common misreading. [/QUOTE]