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c++ armstrong number

 
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c++ armstrong number, tell me urgently
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fahad g
12 Apr, 2008 - 12:50 PM
Post #1

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Joined: 12 Apr, 2008
Posts: 1
how kan i make the c++ program in which user kan enter any number (of any digits) and then the program tells that this is armstrong number or not...
i have made the program for 3 digits..pls tell me how kan i modify this to infinite number of digits???its important for me pl tell me now...
the program which i made for 3 digit number is:
CODE
#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int a,b,c,d,e,f;
cout<<" AMSTRONG NUMBER \n";
cout<<"\n";
cout<<"enter a number=";
cin>>a;
b=a%10;
c=a/10;
d=c/10;
e=c%10;
b==b*b*b;
d==d*d*d;
e==e*e*e;
f=b+d+e;
if (a=f)
{
cout<<"AMSTRONG NUMBER";
}
else
{
cout<<"wrong numbeR!try aGain!";
}
getch();
}

waiting...

*Mod Edit: added code tags: code.gif
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NickDMax
RE: C++ Armstrong Number
12 Apr, 2008 - 08:25 PM
Post #2

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let me see... Armstrong Number - the sum of the cube of its digits equals the number...

To get a number's bottom digit you use:

digit1 = number % 10;
then number = number / 10; to remove that digit
digit2 = number % 10;
number = number / 10;
digit3 = number % 10;

Ok... now we just have to check:

cube1 = digit1 * digit1 *digit1; or we could use pow(digit1, 3)
cube2 = digit2 * digit2 *digit2;
cube3 = digit3 * digit3 *digit3;

if (cube1 + cube2 + cube3 == originalNumber) then smile.gif else sad.gif
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PsychoCoder
RE: C++ Armstrong Number
12 Apr, 2008 - 08:26 PM
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QUOTE(fahad g @ 12 Apr, 2008 - 01:50 PM) *

its important for me pl tell me now...


A little demanding aren't we?
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NickDMax
RE: C++ Armstrong Number
12 Apr, 2008 - 08:30 PM
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oopse my bad... you had the three digit version working

Well to modify this to a general case you just need to add the above logic to a loop:

total = 0
BEGIN:
digit = number % 10;
number = number / 10;
cube = digit * digit * digit;
total += cube;
LOOP if number > 0
if total = original number then smile.gif else sad.gif

QUOTE(PsychoCoder @ 12 Apr, 2008 - 09:26 PM) *

QUOTE(fahad g @ 12 Apr, 2008 - 01:50 PM) *

its important for me pl tell me now...


A little demanding aren't we?


yea... I noticed that too...
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