Here you will get the program for Armstrong number in C.

Armstrong number is n digits number whose entirety of digits raised to control n is equivalent to itself.

For example:

```
#include<stdio.h>
#include<math.h>
int main()
{
int n,m=0,p=0,x,y;
printf("Enter any number: ");
scanf("%d",&n);
y=n;
while(y!=0){
y=y/10;
p++;
}
y=n;
while(n!=0)
{
x=n%10;
m+=pow(x,p);
n=n/10;
}
if(y==m)
printf("The given number is an armstrong number");
else
printf("The given number is not an armstrong number");
return 0;
}
```

**Output**

```
Enter any number: 371
The given number is an armstrong number
```