01 #include<stdio.h>
02 
03 int main()
04 { 
05  int num,i,p,r,sum=0,save_num; 
06  printf("Enter a number"); 
07  scanf("%d",&num); 
08  save_num=num;
09   
10  while(num) 
11  { 
12   i=1,p=1; 
13   r=num%10; 
14  
15   while(i<=r) 
16   { 
17    p=p*i; 
18    i++; 
19    } //while
20    
21  sum=sum+p; 
22  num=num/10; 
23  } //while 
24  
25  if(sum==save_num) 
26   printf("%d is a Strong number", save_num); 
27  else 
28   printf("%d is not a Strong number", save_num); 
29   
30  return 0;
31 }

 OUTPUT :
 
 (1st Run)
 
 Enter a number 145
 145 is a Strong number
 
 
 (2nd Run)
 
 Enter a number 131
 131 is not a Strong number