loop debug

[stanlvw]

Hi, I am a c++ beginner. I have written this code below. The compiler recognizes it and compiled it. But once the program gets into the loop, I can't get out of the loop even by meeting the conditions. I checked the syntax of the code and I don't think there is anything wrong with it. But I don't know what's wrong with it. Please help. I gratefully appreciate it. Thank you!

//*************************************************************
// Mileage Program
// This program computes the miles per gallon a car gets on a
// trip
//*************************************************************

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

int main()
{
	int fillupFlag;		// Flag variable to exit the fillup loop
	float startingMileage;	// Starting mileage
	float endingMileage;	// Ending mileage
	float fillup;		// amount(s) in gallons of fillups
	float milesPerGallon;	// miles per gallon the car gets on the trip
	float totalFillup;	// sum of the amount of fillups	

	totalFillup = 0;	// Total amount of fillup in the beginning
	fillupFlag = 1;		// Initializing the flag variable
		// not equal to 0 so that the program does not skip the loop
	

	cout << "Welcome to the Mileage Program!" << endl;
	cout << "This program computes the miles per gallon a car gets "
	     << "on a trip" << endl;
	cout << " " << endl;
	cout << "Please enter the starting mileage: " ;
	cin >> startingMileage;
	cout << "Please enter the ending mileage: " ;
	cin >> endingMileage;

	while (fillupFlag != 0)
	{
		cout << "Fillup #" << fillupFlag << endl;
		cout << "Please enter the amount of the fillup in gallons"
		     << endl;
		cout << "(Enter 0 when there is no more fillup): ";
		cin >> fillup;
		totalFillup = totalFillup + fillup; // Calculating total
					 // amount in gallons of fillups
		if (fillup = 0.0)		// Are there anymore fillups?
			fillupFlag = 0;		// No.
		else
			fillupFlag++;	// Yes.
	}

	milesPerGallon = (endingMileage - startingMileage) / totalFillup;

	cout << "The miles per gallon your car gets on the trip is"
	     <<" approximately " << milesPerGallon << " miles per gallon." 
	     << endl;		// Outputing the results
	
	return 0;
}

[ripper079]

try this

if (fillup == 0.0)

insteed

[stanlvw]

Thank you very much for the pointer. The program worked after the correction!