## Armstrong numbers:

Input : 153.

Calculating armstrong number: 153 =(1*1*1)+(5*5*5)+(3*3*3)= 1+125+27 =153

If input equals output, 153==153, 153 is armstrong number.

```
#include<stdio.h>
#include<conio.h>
void main()
{
int num, n, rem;
int cube=0, sum;
printf("n Armstrong numbers between 1 and 1000 are: n");
for(num=1;num<=1000;num++)
{
sum=0;
n=num;
while(n>0)
{
rem=n%10;
cube=rem*rem*rem;
sum=sum+cube;
n=n/10;
}
if(num==sum)
{
printf("n%d is armstrong number",num);
}
getch();
}
```

**Ouput:**

```
Armstrong numbers between 1 and 1000 are:
1 is armstrong number
153 is armstrong number
370 is armstrong number
371 is armstrong number
407 is armstrong number
```