Thread: Checking Peterson Number

Greetings everyone, I wrote a program to check if a number is peterson or not and does not seems to be working. Can anyone please check it out.

Code:

#include <stdio.h>
#include <conio.h>
#include <math.h>
int main()
{
 long int sum=0,f,copy,fact, num;
 clrscr();
 printf("Entre a Number:");
 scanf("%ld", &num);
 num=copy;
 while(num>0)
 {
  for(f=num%10, fact=1;f>0;f--)
  {
   fact=f*fact;
  }
  sum+=fact;
  num/=10;
 }
 if(sum==copy)
 printf("The Number is piterson number");
 else
 printf("The Number is Not piterson Number");
 getch();
 return 0;
}

Thank you in advance.

Thanks to your signature I solved my problem.

I simply printed num, copy. I found it out that Num was gettting scaned alright but num is not being stored in copy.

so What I did was, Reversed the code and made it

Code:

copy=num;

now num is being stored in copy instead of copy(which had no assinged value) being stored in num.

THank you very much.

Originally Posted by sunny`

Thanks to your signature I solved my problem.

I simply printed num, copy. I found it out that Num was gettting scaned alright but num is not being stored in copy.

so What I did was, Reversed the code and made it

Code:

copy=num;

now num is being stored in copy instead of copy(which had no assinged value) being stored in num.

THank you very much.

good job i was reading your code and was about to point out that problem to you

what is the problem with conio.h?

Not a c standard library header. See conio.h - Wikipedia, the free encyclopedia. Is there a specific reason you are using this? By default I include stdio.h and stdlib.h for most c programming of mine.

Greetings all, I wanted to print all the peterson numbers in a giving range and wrote a program.

The output is 1 and then it hangs.( for input 1 and 500)

Code:

#include <stdio.h>
#include <conio.h>
int main()
{
 
long int i,sl,el, sum=0,f,copy,fact=1;
 clrscr();
 printf("Entre a range of Number:");
 scanf("%ld%ld", &sl, &el);
 for(i=sl;i<=el;i++)
 {
  copy=i;
  while(i>0)
  {
for(f=i%10, fact=1;f>0;f--)
   fact=f*fact;
   sum+=fact;
   i/=10;
   fact=1;
  }
  if(sum==copy)
  printf("%ld\n",sum);
 }
  getch();
  return 0;
}

Without taking time to figure out what a Peterson Number is, my first guess is that sum isn't being zeroed for each new number in the outer for loop.

ok I zeroed the sum but still its not running correctly.

peterson number is a number say xyz.

then xyz=x!+y!+z!

example is 145=1!+4!+5!

Originally Posted by sunny`

Greetings all, I wanted to print all the peterson numbers in a giving range and wrote a program.

The output is 1 and then it hangs.( for input 1 and 500)

Code:

 for(i=sl;i<=el;i++)
 {
  copy=i;
  while(i>0)
  {
for(f=i%10, fact=1;f>0;f--)
   fact=f*fact;
   sum+=fact;
   i/=10;
   fact=1;
  }
  if(sum==copy)
  printf("%ld\n",sum);
}

That line there is your problem. You change i in your while loop, leaving it zero at the end, the your outer for loop does i++ so it's 1, then your while loop makes it 0 again, and you have an infinite loop.