C :: File I/O Finding Max And Min Numbers

My question is to write a complete program that will search a file of numbers(numbers.txt) for the smallest and largest numbers and then write the values to the screen using a single pass through the file. File only contains type int and holds at least one int. My questions are am I reading in the first number correctly? Where would I read in the second number to compare to the current max and min?

Code:

#include <stdio.h>
#include <stdlib.h>
int main(int argc, char * argv[])
{
FILE *fin;
fin = fopen("numbers.txt", "r");
//check to make sure file opened
if(fin == NULL)
}

[code]...