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What is recursive function?

When a function in C program calls by itself, then that function is called recursive function. This process is called recursion.

C program for recursive function:

Factorial and fibonacci series will be a good example for recursive function as it calls by itself. Let's discuss about Factorial program here.

#include <stdio.h>

int factorial(unsigned int);

int main()

{

int i = 8;

printf("Factorial of the number %d is %d\n", i, factorial(i));

return 0;

}

int factorial(unsigned int i)

{

if(i < 2)

{

return 1;

}

return i * factorial(i - 1);

}

Output:

Factorial of the number 8 is 40320

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