Factorial program in C Programming Language: C Program code to find and print factorial of a number.

Factorial can be achieved by three methods as follow:

  1. Factorial Program using loop,
  2. Program using a function to find factorial and
  3. Factorial Program using recursion.

Factorial is represented using ‘!’, so five factorial will be written as (5!), n factorial as (n!). Also n! = n*(n-1)*(n-2)*(n-3)…3.2.1 and zero factorial is defined as one i.e. 0! = 1.

Factorial program in C Programming using ‘for’ loop

Here we find factorial using ‘for’ loop.

Output:

 

Factorial program in C Programming using function

Here we find factorial using function.

 

Factorial program in C Programming using recursion

Here we find factorial using Recursion.

Recursion is a technique in which a function calls itself, for example in above code factorial function is calling itself. To solve a problem using recursion you must first express its solution in recursive form.

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