Magic number java7/14/2023 Magic numbers become particularly confusing when the same number is used for different purposes in one section of code. A programmer reading the first example might wonder, What does the number 52 mean here? Why 52? The programmer might infer the meaning after reading the code carefully, but it's not obvious. This is preferred for at least three reasons: It is considered better programming style to write: In the above example, 52 is a magic number. The function randomInt(x) chooses a random integer between 1 to x, inclusive, and swapEntries(i, j) swaps the i th and j th entries in the array. In most cases this makes programs harder to read, understand, and maintain, although most guides make an exception for the numbers zero and one.įor example, to shuffle the values in an array randomly, this pseudocode will do the job: Numbers directly in source code without explanation. The term magic number also refers to the bad programming practice of using The Unix program file can read and interpret magic numbers from files. This magic number encodes a bitmap of the Nintendo logo.
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