Ok, I have to create a program that prints whether a number is in the Fibonacci sequence. This is what i have so far, but i could use some help:

Code:
#include <iostream>
#include <iomanip>
using namespace std;
int main (void)
{
int valin, n=0;
cout << "Input a positive integer: " << endl;
cin>> valin;
if (valin==0 || valin==1)
cout << "The number" << valin << "is in the Fibonacci sequence." << endl;
else if (valin==(n-1)+(n-2))
cout << "The number" << valin << "is in the Fibonacci sequence." << endl;
else
cout << "The number"  << valin << "in not in the Fibonacci sequence." << endl;
return 0;
}
I don't know if this is the best way to go about this problem. Also, is there a way for me to use "bool found=false;" or "char found='N';"
any help would be appreciated, thanks