Write a c programme to check whether given number is Fibonacci?

#include<iOStream.h>

#include<conio.h>

void main()

{

long int n,a=0,b=1;

cout<<"dear user Enter number as u wish";

cin>>n;

while(n>0)

{

c=a+b;

cout<<"c<<"\t\t";

a=b;

b=c;

}

getch();

}