Write a program in c to check given number is armstrong or not using function??

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Write a program in c to check given number is Armstrong or not using function??
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/*illustrate code*/ 
#include<stdio.h>
#include<conio.h>
int arm(int,int);
void main()
{int n,sum=0,temp,remainder,digits=0;
printf("\n input an integer");
scanf("%d",&n);
temp=n;
while(temp!=0)
{digits++;
temp=temp/10;
}
temp=n;
while(temp!=0)
{remainder=temp%10;
sum=sum+arm(remainder,digits);
temp=temp/10;}
if(n==sum)
printf("%d is an armstrong number:",n);
else
printf("%d is not armstrong number:",n);
getch();
}
int arm(int n,int r)
{int c,p=1;
for(c=1;c<=r;c++)
p=p*n;
return p;

}

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Thank-You