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// Stuart Reges handout #24
// 8/27/99
//
// Class Accumulator keeps track of the state of an adding machine. It
// accumulates digits to form entire numbers and either adds or subtracts
// those numbers to a cumulative sum. It also has a reset option.
public class Accumulator {
private int myCurrent; // current number
private int mySum; // current sum
private int myDisplay; // current display
// post: current number, current sum, display all cleared
public void clear() {
myCurrent = 0;
mySum = 0;
myDisplay = 0;
}
// post: digit is added to the end of the current number
public void addDigit(int digit) {
myCurrent = myCurrent * 10 + digit;
myDisplay = myCurrent;
}
// post: current number is added to sum and cleared, current
// sum is displayed
public void plus() {
mySum = mySum + myCurrent;
myCurrent = 0;
myDisplay = mySum;
}
// post: current number is subtracted from sum and cleared,
// current sum is displayed
public void minus() {
mySum = mySum - myCurrent;
myCurrent = 0;
myDisplay = mySum;
}
// post: returns current display
public int getDisplay() {
return myDisplay;
}
}
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