C Program to check fibonacci numbers

Simple C program to check Fibonacci numbers: Fibonacci series is 0,1,1,2,3,5,8,13,21.. So if number is in this series then program will print that number is in Fibonacci series otherwise number is not in Fibonacci series.

#include<stdio.h>
int main()
{
 int n1=0,n2=1,n,c=1;
 printf("Enter a number: ");
 scanf("%d",&n);
 if(n==0||n==1)
 {
  printf("Number is in fibonacci series\n");
 }
 else
   while(n2<n)
   {
    int temp=n1;
    n1=n2;
    n2=temp+n2;
    if(n2==n)
    { 
     c=1;
    }
    else
    {
     c=0;
    }
   }
   if(c==0)
   printf("Number is not in fibonacci series\n");
   else
   printf("Number is in fibonacci series\n");
}