C PROGRAM TO PRINT FACTORIAL OF A NUMBER USING RECURRING | PROGRAMLEARNERZ | PROGRAM LEARNERZ

 

Hii friends

In this example,you will learn about how to find factorial of a given(positive) number in c language using recurssion.

For example-

Sample input

5

Sample output

Factorial of 5 is 120.

PROGRAM

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YOU CAN COPY THE CODE FROM HERE

in this code we wrote a function named factorial.in that we write our program, if n >=1 code returns n*factorial(n-1).and this factorial(n-1) again goes to the function as n-1 and it will repeat it until n becomes 0;(becuase we wrote n>=1 in if condition).if n=0 then the fuction return 1.

for example

if we take n=5. 

in the function it goes to if condition and check the condition.

if(5>=1) true

then it returns 5*factorial(5-1);

5*factorial(4);

then it returns 5*4*factorial(4-1); == 5*4*factorial(3);  (if condition true).

then it returns 5*4*3*factorial(3-1); == 5*4*factorial(2); (if condition true).

then it returns 5*4*3*2factorial(2-1); == 5*4*factorial(1);  (if condition true).
then it returns 5*4*3*2*factorial(1-1); == 5*4*factorial(0);  (if condition false).
here if condition false then it returns 1;
so it becomes 5*4*3*2*1==120.
in this way this this function recall itself until the if condition false.

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