Fibonacci Numbers v2

//   The Fibonacci Sequence
//   Functions
//   Simeon Baltadziev
//   09.05.2017
//   C programming basics

#include <stdio.h>


int fibonacciNumber(int enteredNUmber) {
    int i;
    int enteredNumber;
    printf("Enter fibonacci's number: ");
    scanf("%d", &enteredNumber);
    // Checks if input value is 0 or negative number
    if(enteredNumber == 0) { printf("Error: Input larger number than 0"); }
    if(enteredNumber <0)   { printf("Error: Input possitive number"); }
    int a = 1, b =1; // Declaring the fisrt two fibonacci numbers
    for(i = 0; i<=enteredNumber;i++) {
        // Fibonacci Number Formula
        b = a-b;
        a = a+b;
        }
    if(enteredNumber>0) {    return b; }

}
int main (int argc, char *argv[])
{
 int enteredNumber; scanf("%d", &enteredNumber);
 int number = fibonacciNumber(enteredNumber);
 printf("%d", number);
 return 0;

}