Why Should You Avoid Magic Numbers In Programming?

Why are magic numbers bad?

A magic number is a numeric literal (for example, 8080 , 2048 ) that is used in the middle of a block of code without explanation.

It is considered bad practice to use magic numbers because: A number in isolation can be difficult for other programmers to understand..

Is 2 a magic number?

The 2 is a magic number and the code needs to be refactored. By introducing a new variable, we can communicate the meaning the value 2 . We could also re-use the variable elsewhere in the code.

Why is 3 a powerful number?

Three is the smallest number we need to create a pattern, the perfect combination of brevity and rhythm. It’s a principle captured neatly in the Latin phrase omne trium perfectum: everything that comes in threes is perfect, or, every set of three is complete. … We can use the rule of three to powerful effect.

Is 3 an evil number?

Examples. The first evil numbers are: 0, 3, 5, 6, 9, 10, 12, 15, 17, 18, 20, 23, 24, 27, 29, 30, 33, 34, 36, 39 …

Which is not a magic number?

Although Z = 92 and N = 164 are not magic numbers, the undiscovered neutron-rich nucleus uranium-256 may be doubly magic and spherical due to the difference in size between low- and high-angular momentum orbitals, which alters the shape of the nuclear potential.

What is a magic number in coding?

Unnamed numerical constants. The term magic number or magic constant refers to the anti-pattern of using numbers directly in source code. This has been referred to as breaking one of the oldest rules of programming, dating back to the COBOL, FORTRAN and PL/1 manuals of the 1960s.

Is 0 a magic number?

0, 1, -1, 2 These are not generally considered magic numbers, and it’s ok to have them in your code. However, it’s often possible to add more context to explain why you’re using these numbers.

Why is 3 a magic number?

In their eyes the number 3 was considered as the perfect number, the number of harmony, wisdom and understanding. … It was also the number of time – past, present, future; birth, life, death; beginning, middle, end – it was the number of the divine.

Why 9 is a magic number?

Nine is a Motzkin number. … In base 10, a positive number is divisible by 9 if and only if its digital root is 9. That is, if any natural number is multiplied by 9, and the digits of the answer are repeatedly added until it is just one digit, the sum will be nine: 2 × 9 = 18 (1 + 8 = 9)

Is 6 a magic number?

The examination of the incremental binding energies reveals the magicality of the conventional nuclear magic numbers, but it also reveals that 6 and 14 are magic numbers. … If only the conventional magic numbers {2, 8, 20, 28, 50, 82, 126} are considered the shell capacities are {2, 6, 12, 8, 22, 32, 44}.

Is 3 a powerful number?

The most powerful number in the Bible is number 3 and denotes several significant elements and events in the Holy Book. For example, the Godhead is a trinity featuring God the Father, Son, and Holy Spirit.

Why is 6174 a magic number?

6174 is a harshad number, since it is divisible by the sum of its digits: 6174 is a 7-smooth number, i.e. none of its prime factors are greater than 7. 6174 can be written as the sum of the first three degrees of 18: 183 + 182 + 181 = 5832 + 324 + 18 = 6174.