Need help finding biggest and smallest numbers

Hey guys I need help finding the smallest and biggest number. All of the numbers are in one file. Then I need to create a file to output the result.
There are 7 different numbers to analyze that the program reads. I just can't seem to get the biggest number or the smallest. Also I cant use an array (teacher said). I asked my classmates and told me to use this:
for (int i=0;i<7;i++)
^ but I dont know where to go from there..
Thank you in advance!

#include "StdAfx.h"
#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
using namespace std;

int main ()
int num1;
int num2 ;
int num3;
int num4;
int num5;
int num6;
int num7;
int total;
float average;
int max;
int min;

ifstream thefile("file1.txt");
ofstream thefile2;"file2.txt");


while (thefile>>num1>>num2>>num3>>num4>>num5>>num6>>num7){

total = num1+num2+num3+num4+num5+num6+num7;
for (int i=0;i<7;i++)

thefile2<<"The total for the line above is: "<<total<<endl;
thefile2<<"The average for the line above is: "<<average<<endl;
thefile2<<"The biggest number is: "<<endl;
thefile2<<"The smallest number is: "<<endl;

return 0;
Read a number. Is it the biggest so far? Make a note of it if it is.
Repeat until no more numbers to be read.
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