Can someone help me to make my program sort according to the average gallons used per car I keep geting 30 - 40 error when i try to compile it. Also

my files do exist.

Code:#include <fstream> #include <iostream> #include <iomanip> using namespace std; const int MAXCARS = 12; float avgallons = 0; int numel = 0; float totalmiles, totalgallons; struct Car { int number, miles; float gallons; float averagegallons; }Cars; Car Cars[MAXCARS]; void getdata(int, int, float); void processdata(int, float); void sort(float); void putdata(int, float); ifstream HopeData; ofstream MikeData; void main() { HopeData.open("gdata.dat"); MikeData.open("pdata"); if(HopeData.fail()) { cout << "\n\nFile not successfully opened\n\n"; } cout << "\n\nFile successfully opened\n\n"; MikeData << "\n\n Car Report" << endl; MikeData << "Number Average Per Car" << endl; cout << setiosflags(ios::showpoint); cout << setiosflags(ios::fixed); cout << setprecision(2); getdata(Cars.number, Cars.miles, Cars.gallons); putdata(Cars.number, Cars.averagegallons); MikeData << "\n\nAverage Gallons Used by All Cars is " << avgallons << endl; } void getdata(int number, int miles, float gallons) { while(HopeData.peek() != EOF) { HopeData >> Cars.number >> Cars.miles >> Cars.gallons; HopeData.ignore(80,'\n'); processdata(Cars.miles, Cars.gallons); } } void processdata(int miles, float gallons) { Cars.averagegallons = Cars.miles / Cars.gallons; totalmiles = totalmiles + Cars.miles; totalgallons = totalgallons + Cars.gallons; avgallons = totalmiles / totalgallons; numels++; sort(Cars.averagegallons); } void sort(float averagegallons, int numels) { int i,j,min,minidx,temp,moves=0; for(i=0;i<numels;i++) { min = Cars[i]; minidx = i; for(j=i+1;j<numels;j++) { if(Cars[j].averagegallons<Cars[i].averagegallons) { min = Cars[j]; minidx=j; } if(min<Cars[i].averagegallons) { temp=Cars[i]; Cars[i]=min; Cars[minidx]=temp; } } } } void putdata(int number, float averagegallons) { while(HopeData.peek() != EOF) { MikeData << Cars[].number << "\t " << Cars[].averagegallons << endl; } }