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C Discussion Thread
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Aug 6th, 2005

-1

need help with factorial using recursion.

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hi i am having a problem with this code.for every input i am getting the same answer 32.any help would be highly appreciated

C Syntax (Toggle Plain Text)
/*program to find the factorial of a given number*/
#include<stdio.h>
main()
{
int n,fact;
int facto(int );
printf("\nenter the number for which you want to find the factorial");
scanf("%d",&n);
fact=facto(n);
printf("\nthe factorial of yhe number %d is %d",n,fact);
}
int facto(int n)
{
int k;
if(n==1)
return(1);
else
k=n*fact(n-1);
return(k);
}
/*program to find the factorial of a given number*/
#include<stdio.h>
main()
{
int n,fact;
int facto(int );
printf("\nenter the number for which you want to find the factorial");
scanf("%d",&n);
fact=facto(n);
printf("\nthe factorial of yhe number %d is %d",n,fact);
}
int facto(int n)
{
int k;
if(n==1)
return(1);
else
k=n*fact(n-1);
return(k);
}

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indianscorpion2

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Aug 6th, 2005

Re: need help with factorial using recursion.

This won't compile:

k=n*fact(n-1);

should be

k=n*facto(n-1);

After making that change, seems to work fine..

enter the number for which you want to find the factorial
7
the factorial of yhe number 7 is 5040

(Be careful though factorials get large very quickly and you have a risk of blowing out the size of an integer, etc.)

winbatch

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Aug 6th, 2005

Re: need help with factorial using recursion.

Quote originally posted by indianscorpion2 ...

C Syntax (Toggle Plain Text)
if(n==1)
return(1);
if(n==1) return(1);

Also, this should be

C Syntax (Toggle Plain Text)
if (n == 0)
    return 1;
if (n == 0)
    return 1;

Rashakil Fol

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Aug 6th, 2005

Re: need help with factorial using recursion.

(Toggle Plain Text)

/*program to find the factorial of a given number*/
#include<stdio.h>
main()
{
int fact(int );
/*-----------------------------------------------------*/
int n,fact;
printf("\nenter the number for which you want to find the factorial");
scanf("%d",&n);

fact=fact(n);

printf("\nthe factorial of yhe number %d is %d",n,fact);

}
/*-----------------------------------------------------*/
int fact(int n)
{
if(n==1)  return(1);

else  return n*fact(n-1);
}

F1uT3

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Aug 1st, 2009

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factorial using recursion.

C Syntax (Toggle Plain Text)
#include<stdio.h>
#include<conio.h>
int factorial (int);
void main()
{
	auto int num , res;
	clrscr();
	printf("Enter the Number.....");
	scanf("%d",&num);
	res = factorial(num);
	printf("Factorial Of %d Is %d" , num , res);
	getch();
}
int factorial(int num)
{
	int res =1;
	if(num!=0)
	res = num * factorial(num-1);
	return res;
 
}
#include<stdio.h>
#include<conio.h>
int factorial (int);
void main()
{
	auto int num , res;
	clrscr();
	printf("Enter the Number.....");
	scanf("%d",&num);
	res = factorial(num);
	printf("Factorial Of %d Is %d" , num , res);
	getch();
}
int factorial(int num)
{
	int res =1;
	if(num!=0)
	res = num * factorial(num-1);
	return res;

}

Last edited by ##k.k##; Aug 1st, 2009 at 4:03 am.

##k.k##

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Aug 1st, 2009

-1

factorial using recursion.

C Syntax (Toggle Plain Text)
#include<stdio.h>
#include<conio.h>
int factorial (int);
void main()
{
	auto int num , res;
	clrscr();
	printf("Enter the Number.....");
	scanf("%d",&num);
	res = factorial(num);
	printf("Factorial Of %d Is %d" , num , res);
	getch();
}
int factorial(int num)
{
	int res =1;
	if(num!=0)
	res = num * factorial(num-1);
	return res;
 
}
#include<stdio.h>
#include<conio.h>
int factorial (int);
void main()
{
	auto int num , res;
	clrscr();
	printf("Enter the Number.....");
	scanf("%d",&num);
	res = factorial(num);
	printf("Factorial Of %d Is %d" , num , res);
	getch();
}
int factorial(int num)
{
	int res =1;
	if(num!=0)
	res = num * factorial(num-1);
	return res;

}

Last edited by ##k.k##; Aug 1st, 2009 at 4:03 am.

##k.k##

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Aug 1st, 2009

Re: factorial using recursion.

NO - void main is bad! At least use the signature int main() or int main(void) at the very least.

yellowSnow

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Aug 1st, 2009

Re: factorial using recursion.

Damn! I didn't realise this thread was started 4 friggin' years ago.
Thanks a lot ##k.k## - why did you "revive" a thread from 4 years ago that had been answered?

- and void main is still bad!

Sheesh

Last edited by yellowSnow; Aug 1st, 2009 at 6:01 pm. Reason: pissed off

yellowSnow

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Aug 3rd, 2009

Re: factorial using recursion.

Sorry Bro......I didn't see that the post is 4 year ago.........

I am just searching .......for this code.....i mean correct one...

but i didn't found the correct one.......

So i write it down......

I m bit confuse in 0!=1 or ZERO.....thats why....i am in search of this code....

By the way .....what is wrong with void main?????

##k.k##

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since Aug 2009

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Oct 13th, 2009

-1

modiffication in factorial problem by sanjeev

/****************C Program for factorial by using recursion**************/
#include<stdio.h>
int fact(int a);
int facto(int s) //this function will calculate by recursive
{
if((s==0)||(s==1))
return 1;
else
return(s*facto(s-1));
}
main()
{ int n,result,result1;
printf("Pls enter ur num\n");
scanf("%d",&n);
result=facto(n);
result1=fact(n);

printf("facto of ur num= %d\n fact of ur num =%d\n",result,result1);
}

/***************************function for factorial without recursive*************/
int fact(int a)

{ int i,c=1;
for(i=1;i<=a;i++)
c=c*i;
return(c);
}

sanjeevtanwar

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