Fibonacci series(variant)-searching for a number in it

C program to know whether a particular number present in the Fibonacci series or not.

Sample input1:

Number to be searched: 5

Output1:

Found

 

Sample input2:

Number to be searched: 7

Output1:

Not Found

 

Program:

 

#include<stdio.h>
int main()
{
         int key;
         int f0=0,f1=1,f2;
         int a=0;
         printf("\nNumber to be searched: ");
         scanf("%d",&key);
         if((f0==key)||(key==f1))
                printf("\nFOUND");
         else
         {
                f2=f0+f1;
                while(f2<key)
                {
                         f2=f0+f1;
                         if(f2==key)
                         a=1;
                         else{
                         f0=f1;
                         f1=f2;
                         }
                }
                if(a)
                printf("\nFOUND");
                else
                printf("\nNot found");
         }
         return 0;
}