infinite loop with do-while

[CTMitchell]

I have a project to do that takes students names and grades from a .txt file and display their names, avgs, and the highest avg. I must do this with a do-while loop. I have completed the program and it compiles fine but when I run it the program goes into an infinite loop. Any help would be awesome.

#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
using namespace std;

int main()
{
ifstream inFile;

int chmp;
double test1, test2, test3, test4, test5, test6, test7;
double avg, avg1, avg2;

string firstName, lastName;
string firstName1, lastName1;
string firstName2, lastName2;

inFile.open("C:\\Users\\Cheeto\\Desktop\\PROG8\\prog8Data.txt");

inFile >> firstName >> lastName >> test1 >> test2 >> firstName1 >> lastName1 >> test3 >> test4 >> test5
>> firstName2 >> firstName2 >> test6 >> test7;
//----------

cout << firstName << " " << lastName << " " << avg << endl;

cout << firstName1 << " " << lastName1 << " " << avg1 << endl;

cout << firstName2 << " " << lastName2 << " " << avg2 << endl;

//----------Loop for highest avg
do{
avg = (test1 + test2) / 2;
avg1 = (test3 + test4 + test5) / 3;
avg2 = (test6 + test7) / 2;
     if(avg > avg1 && avg2){
            cout << firstName << " " << lastName << " has the highest average: ";
            } 
     if(avg1 > avg && avg2){
             cout << firstName1 << " " << lastName1 << " has the highest average: ";
            }
     if(avg2 > avg && avg1){
             cout << firstName2 << " " << lastName2 << " has the highest average: ";
            }     
}
while (avg != avg1);{ 
      cout << "Error" << endl;       
      }
inFile.close();
system("pause");
return 0;
}

[ricomoss]

The reason this will generate an infinite loop is because you haven't provided a condition in which avg or avg1 can change in the case that avg != avg1.