1. Fibonacci Number Given a number N,figure out if it is a member of fibonacci series or not.Return true if the number is memebr of fibonacci sereis else false.
    Fibonacci Series is defined by the recurrence
    F(n) = F(n-1) + F(n-2)
    where F(0) = 0 and F(1) = 1

    Input Format :
    Integer N
    Output Format :
    true or false
    Constraints :
    0 <= n <=10^4
    Sample Input 1 :
    5
    Sample Output 1 :
    true
    Sample Input 2 :
    14 Sample Output 2 :
    false
    
#include
using namespace std;
            
bool isFib(int n){
    int i=1;
    int fisrtNum=0;
    int secondNum=1;
    if(n==0 || n==1){
        return true;
    }
    while(i<=n){
        int x= fisrtNum+secondNum;
        if(x==n){
            return true;
        }
        fisrtNum=secondNum;
        secondNum=x;
            
        i++;
    }
               
    return false;
               
}
int main(){
    cout<<"ENTER YOUR NUMBER: "<<endl;
    int x;
    cin>>x;
    int y= isFib(x);
    cout<<y<<endl;
}

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