Armstrong Number

In this program, the while loop is used. The Armstrong number starts from 0, 1, 153, 370,... and so the mathematical formula is used in this program, Also while loop and if else is used together in this program.
Basically , armstrong no. are the ones whose cube of individual digits when added it gives back the no. .  
For eg :- no. is 153 ...1^3 + 5^3 + 3^3 = 153 itself

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Program to check Armstrong Number.

#include<stdio.h>
#include<conio.h>
void main()
{       int a=0,n=0,sum=0,m=0;
clrscr();
printf("To check whether no. is armstrong or not");
printf("\n\n\t enter the no. to check : ");
scanf("%d",&n);
n = m;
while(n>0)
{ a = n%10;
sum = sum + a*a*a;
n = n/10;
}
if(sum==m)
{ printf("\n\n\t no. is armstrong");
}
else   printf("\n\n\t no. is not armstrong");
getch();
}