What does x! mean in c language

In C language, "x!" represents the factorial of x, that is, multiplying x with all natural numbers smaller than it. The factorial calculation formula is as follows: 0! = 1x! = x (x-1) ... 3 2 * 1 (for x>0)

The meaning of "x!" in C language

In C language, "x!" represents the factorial of x. A factorial is a mathematical operation that multiplies a natural number with all natural numbers smaller than it.

Rules for calculating factorials

• 0! = 1
• x! = x (x-1) ... 3 2 * 1 (for x>0)

Example

• 5! = 5 4 3 2 1 = 120
• 10! = 10 9 8 7 6 5 4 3 2 * 1 = 3628800

Use factorial

Factorials have use cases in many mathematical and computer applications, including:

• combination
• arrangement
• Probability
• statistics

Using factorial in C

There is no built-in factorial function in C. However, you can write your own function to calculate factorials:

 <code class="c">long long factorial(int x) { if (x == 0) { return 1; } else { return x * factorial(x - 1); } }</code>

You can calculate the factorial of x by calling factorial(x) function.

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