dev c++ - prime-armstrong number with C -

i newbie @ c language , working @ exercise: write c program print prime armstrong number b.

and code:

#include<stdio.h> #include<math.h> int p(int n){     int i; for(i=2;i<=n/2;i++){     if(n%i==0){     return 1;      }    } } int a(int n){ int i,a,b,c=0,e,p=0,j; a=n; while(n!=0){     n=n/10;     c++; } e=a; while(a!=0){     j=a%10;     p=p+pow(j,c);     a=a/10; } if(e==p){     return 1; } } int main(){ int f1=1,f2=0,a,b,i; scanf("%d%d",&a,&b);  for(i=a;i<=b;i++){     f1=p(i);     f2=a(i);     if(f1==0 && f2==1){         printf("%d prime armstrong number\n",i);     }else{         printf("%d not prime armstrong number\n",i);     } } return 0; } 

i searched on google prime armstrong numbers are: 28116440335967, 449177399146038697307, 35452590104031691935943,...

i want know, wrong code? or maybe result big , computer can not run program? used dev-c , computer-32bit. appreciate if can find answer.