If the sum of, each digit raised to the power of
number of digits in the number, is equal to the number itself, then the number
is called Armstrong number.
For
example, 153=(13)+(53)+(33) . So 153 is an
Armstrong number.
Program
code
#include
<stdio.h>
#include
<conio.h>
#include
<math.h>
void
main()
{
/*To
check whether a number is Armstrong number.*/
long
int number=0, check=0, temp=0, power=0, temp1, temp2;
clrscr();
printf("Please
input a whole number to find out whether it is Armstrong number.\n");
scanf("%ld",&number);
temp=number;
/*
Steps to find the number of digits start*/
temp1=0;
temp2=10;
while
(temp2<pow(10,7))
{
power++;
if
((temp>temp1)&&(temp<temp2))
break;
if
(temp1==0)
temp1=temp1+10;
else
temp1=temp1*10;
temp2=temp2*10;
}
/*
Steps to find the number of digits ends*/
/*Steps
to calculate check start*/
for
(temp=number;temp>0;temp=temp/10)
check=check+pow((temp%10),power);
/*Steps
to calculate check ends*/
if
(check==number)
printf("%ld
is an Armstrong number.\n", number);
else
printf("%ld
is not an Armstrong number.\n", number);
getch();
}
Example
of output
Please
input a whole number to find out whether it is Armstrong number.
153
153
is an Armstrong number.
