Let’s say that our employer is calculating our paycheck and depositing it to our bank account. We worked 40 hours last week, at a rate of 15.50 an hour. Java can calculate this with the multiplication operator *:
double paycheckAmount = 40 * 15.50;
//paycheckAmount now holds 620.0If we want to see how many hours our total balance represents, we use the division operator /:
double balance = 20010.5;
double hourlyRate = 15.5;
double hoursWorked = balance / hourlyRate;
//hoursWorked now holds 1291.0Division has different results with integers. The / operator does integer division, which means that any remainder is lost.
int evenlyDivided = 10 / 5;
//evenlyDivided holds 2, because 10 divided by 5 is 2
int unevenlyDivided = 10 / 4;
//unevenlyDivided holds 2, because 10 divided by 4 is 2.5evenlyDivided stores what you expect, but unevenlyDivided holds 2 because ints cannot store decimals!
Java removes the 0.5 to fit the result into an int type!
In main(), there is a variable called subtotal, which represents the subtotal of an amount to pay on a bill, and a variable called tax, which represents the amount of tax added to the subtotal.
Create a double variable, total, that holds subtotal plus the product of subtotal and tax.
Print the total variable!
There were 4 people who bought this meal together and want to split the cost.
Create a double variable called perPerson that holds total divided by 4.
Print the perPerson variable!