exercise02.c

// C Primer Plus
// Chapter 12 Exercise 2:

// Gasoline consumption commonly is computed in miles per gallon in the U.S.
// and in liters per 100 kilometers in Europe. What follows is part of a
// program that asks the user to choose a mode (metric or U.S.) and then
// gathers data and computes fuel consumption. If the user enters an incorrect
// mode, the program comments on that and uses the most recent mode. Supply a
// header file and a pe12-2a.c source code file to make this work. The source
// code file should define three file-scope, internal-linkage variables. One
// represents the mode, one represents the distance, and one represents the
// fuel consumed. The get_info() function prompts for data according to the
// mode setting and stores the responses in the file-scope variables. The
// show_info() function calculates and displays the fuel consumption based on
// the mode setting. You can assume the user responds with numeric input.


// compile with exercise02-b.c

#include <stdio.h>
#include "exercise02.h"

int main(void)
{
	int mode;

	printf("Enter 0 for metric mode, 1 for US mode: ");
	scanf("%d", &mode);
	while (mode >= 0)
	{
		set_mode(mode);
		get_info();
		show_info();
		printf("Enter 0 for metric mode, 1 for US mode");
		printf(" (-1 to quit): ");
		scanf("%d", &mode);
	}

	printf("Done.\n");
	return 0; 
}