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#include <stdio.h>
// lab 6
#define MAX 100
main()
{
	float mileage[10], gallons[10];
	int i = 0;
	float milegal;

	printf("Enter Number of Miles:");
        scanf("%f", &mileage[i]);
        printf("Enter Gallons:");
        scanf("%f", &gallons[i]);
	i++;

	while (mileage[i-1] != -1.0) {
		printf("Enter Number of Miles:");
		scanf("%f", &mileage[i]);
		printf("Enter Gallons:");
		scanf("%f", &gallons[i]);
		
                /* current miles/gallon */
		milegal = ((mileage[i] - mileage[i-1]) / gallons[i]);
		printf("Current miles/gallon = %f\n", milegal);




		i++;
		
		
	}	
	return 1;
}