/* Exchange kiosk */

#include <stdio.h>

main()
{
	float dollars_for_mark; /* exchange rate */
	int comission = 3; /* comission in dollars */
	int marks; float dollars;
	
	printf("Enter exchange rate ($ for DM): ");
	scanf("%f",&dollars_for_mark); 
	printf("Marks to exchange?: ");
	scanf("%d",&marks); 

	dollars = marks * dollars_for_mark - comission;
	
	printf("For %6.2f marks you will get %6.2f dollars!\n" , marks, dollars);
	/* 	OOPS! 
		We have tried to print an integer variable marks 
		using %6.2f designed for floats - and printf has printed very strange result */
		
	/* now we print it properly */		
	printf("For %d marks you will get %6.2f dollars!\n" , marks, dollars);

}