Can someone help me out with this program pleases?

Im trying to have all the miles added together and all the gallons added together then divide. For this code I have to have it add as many as I want until I input -1 in for gallons. I have this code correct for the most part its just that its not adding all the miles and all the gallons up. I have counter and counter1 counting how many times I've entered a mile and gallon.

Code:

#include <stdio.h>

int main () 
{
	float miles;
	float gallons;
	int total;
	float tmiles;
	float tgallons;
        float taverage;
	float average;
	int counter;
	int counter1;

	total = 0;
	counter = 0;
	counter1 = 0;

	printf("Enter the gallons used (-1 to end): ");
	scanf("%f", &gallons);

	printf("Enter the miles driven:");
	scanf("%f", &miles);

	average = miles / gallons;

	printf("The miles / gallons for this tank was %f\n\n", average);

	while(gallons != -1) {
		tgallons = total + gallons;
		tmiles = total  + miles;

		printf("Enter the gallons used (-1 to end): ");
		scanf("%f", &gallons);


		if(gallons == -1)
			break;

		counter = counter + 1;

		printf("Enter the miles driven:");
		scanf("%f", &miles);

		counter1 = counter1 + 1;

		average = miles / gallons;

		printf("The miles / gallons for this tank was %f\n\n", average);

		counter++;
	}

	if(tgallons != 0) {

		taverage = tmiles / tgallons;

		printf("The overall average miles / gallons was %f\n", taverage);
	}

	return 0;

}

First of all it looks to me like you haven't initialized the tgallons and tmiles to zero.

The math here is also wrong:

Code:

		tgallons = total + gallons;
		tmiles = total  + miles;

You probably want to change total to the corresponding tX.

--
Mats

What do u mean by change the total to the corresponding tx? You mean like actually change total and replace it with a different variable?

Nm thanks I got it. Ill be sure to post more questions if i need help with my next program.