hello there all, i am just beginning to learn the C++ language and i am having trouble with this excercise from the book that i am doing:
Code:
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <iostream>
#include <iomanip>
#include <cstdlib>
using namespace std;
int main()
{
int totalMile, totalGallon, gallonCounter, aveGallon, aveMile;
double milePerGallon, average, mile, gallon, mileGal;
totalMile = 0;
totalGallon = 0;
gallonCounter = 0;
cout << "Enter the gallons used, (-1 to end) : " << endl;
cin >> gallon;
cout << "Enter the miles driven: " << endl;
cin >> mile;
mileGal = mile / gallon;
cout << "The miles / gallon for this tank was: " << setprecision( 2 )
<< setiosflags( ios::fixed | ios::showpoint )
<< mileGal << endl;
while ( gallon != -1)
{
totalGallon = totalGallon + gallon;
totalMile = totalMile + mile;
gallonCounter = gallonCounter + 1;
cout << "Enter the gallons used, (-1 to end) : " << endl;
cin >> gallon;
cout << "Enter the miles driven: " << endl;
cin >> mile;
mileGal = mile / gallon;
cout << "The miles / gallon for this tank was: " << setprecision( 2 )
<< setiosflags( ios::fixed | ios::showpoint )
<< mileGal << endl;
}
if ( gallonCounter != 0 )
{
aveMile = totalMile/gallonCounter;
aveGallon = totalGallon/gallonCounter;
average = static_cast< double >( aveMile )/static_cast< double >( aveGallon );
cout << "The overall average miles/gallon was: " << setprecision( 2 )
<< setiosflags( ios::fixed | ios::showpoint )
<< average << endl;
}
else
{
cout << "No gallons entered." << endl;
}
return 0;
}
the code is executing but once i want to end the entering of data through -1 it adds the -1 to the computation.
i just want to know what is wrong with my code.
thank you very much.