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freeCoffees.c
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freeCoffees.c
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//
// Calculating how many free coffees one can get with an amount of coupons.
//
#include <stdio.h>
#include <math.h>
int main(int argc, char ** argv)
{
double costOfCoffee;
double couponsInput;
int couponsRequired;
double spendingMoney;
printf("How much does a coffee cost?\n");
scanf("%lf", &costOfCoffee);
if(costOfCoffee < 0.01){
printf("Invalid Input.\n");
return 0;
}
printf("How many coupons does it take to get a free coffee?\n");
scanf("%lf", &couponsInput);
// Coupon cannot be a decimal
if((floor(couponsInput) < couponsInput && couponsInput < ceil(couponsInput)) || (int) couponsInput <= 0){
printf("Invalid Input.\n");
return 0;
}
couponsRequired = couponsInput;
printf("How much money do you have to spend on coffee this month?\n");
scanf("%lf", &spendingMoney);
if(spendingMoney < 0){
printf("Invalid Input.\n");
return 0;
}
int purchasableCoffees = spendingMoney / costOfCoffee;
double moneyRemained = spendingMoney - purchasableCoffees * costOfCoffee;
printf("This month, you can purchase %d coffees at $%.2lf each.\n", purchasableCoffees, costOfCoffee);
int numCoffee = purchasableCoffees;
int currentNumCoffees = 0;
int couponLeftover = numCoffee;
int newCoffees = 0;
// To check if left over coupons is able to get a new coffee.
while(couponLeftover >= couponsRequired){
currentNumCoffees = couponLeftover / couponsRequired;
numCoffee += currentNumCoffees;
newCoffees += currentNumCoffees;
couponLeftover = couponLeftover % couponsRequired + currentNumCoffees;
}
if(newCoffees == 0){
printf("You will not be able to redeem any additional coffees from coupons this month.\n");
} else {
printf("You will be able to redeem an additional %d coffee(s) from coupons.\n", newCoffees);
}
printf("At the end of the month, you will have $%.2lf and %d coupon(s) remaining.\n", moneyRemained, couponLeftover);
if(numCoffee == 0){
printf("On average, you spent $0.00 on each cup of coffee this month.\n");
} else {
double averagePrice = (purchasableCoffees * costOfCoffee) / numCoffee;
printf("On average, you spent $%.2lf on each cup of coffee this month.\n", averagePrice);
}
return 0;
}