I understand upto 3rd line. But how to comes the output don't understand . Plz explain.

Question

int recursive (int num){
if(num==1)
return 2;
return num*recursive (num-1);
}
int main(){
printf("%d", recursive (5));
}

Answer 1

Jayakrishna🇮🇳 sir i think Output should be 240 instead of 125
. This is recursive function you passing 5 then control will pass recursive function then it will check condition if cond is false so next return will work so
return num*recursive (num-1)
Means 5*(5-1) which will be 20 same Again here recursive function is calling and it will decrease by 1 again it will decrease when num will be 1 then if condition will work and it will multiply so 240 will print
But if u write return 3 ; in place of return 2; then it will be 360. Hope you understood.

......... Thankyou.........

Answer 2

From 4 line
5 * ( recursive(5-1))
=> 5 * (4 * recursive(4-1))
=> 5 * 4 * ( 3 *recursive(3-1))
=>5 * 4 * 3 * ( 2 * recursive(2-1)
=>5 * ( 4 * (3 * (2 * (1)))))
=>120

This is called recursive callings...
Edit :
on num == 1, returning 2 cause final answer 240.

Answer 3

If you want to calculate the factorial(n*(n-1)*(n-2)*...*1), i think you must return 1 instead of 2.

Answer 4

Oh, yes.. 😅🐍🐍😆 Thanks for pointing..
I did not see that returning 2.. See I write 1 only.
I just concentrated on explanation that what Suparna Podder asked for.. So that why also, cause wrong calculation of 125 instead 120..
Yes, final answer we get is 240.
Thank again... [I will edit..]