Coin Counter Simulator

// include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(23, 24, 27,28, 29, 30, 34, 33, 32, 31);

const short buttonPenny= 19;
const short buttonNickel= 18;
const short buttonDime= 15;
const short buttonQuarter= 14;

short pennyButtonState = 0; 
short nickelButtonState = 0; 
short dimeButtonState = 0; 
short quarterButtonState = 0; 

unsigned int numPennies = 0;
unsigned int numNickels= 0;
unsigned int numDimes= 0;
unsigned int numQuarters = 0;
unsigned int totalDecimal=0;
unsigned int totalDollar=0;
unsigned int decimal=0;
int points= 0;

void setup() {
 // set up the LCD's number of columns and rows: 
 lcd.begin (16, 2);
 pinMode (buttonPenny, INPUT_PULLUP );
 pinMode (buttonNickel, INPUT_PULLUP );
 pinMode (buttonDime, INPUT_PULLUP );
 pinMode (buttonQuarter, INPUT_PULLUP );
}

void loop() {
 
 // set the cursor to column 0, line 1
 // (note: line 1 is the second row, since counting begins with 0):
 lcd.setCursor (0, 0);
 
 pennyButtonState = digitalRead (buttonPenny);
 nickelButtonState = digitalRead (buttonNickel);
 dimeButtonState = digitalRead (buttonDime);
 quarterButtonState = digitalRead (buttonQuarter);
 
 if (pennyButtonState == 1){ 
 lcd.clear();
 numPennies++;
 lcd.print("Penny");
 delay (200);
 }
 
 if (nickelButtonState == 1){ 
 lcd.clear();
 numNickels++;
 lcd.print("Nickel"); 
 delay (200);
 }
 
 if (dimeButtonState == 1){ 
 lcd.clear(); 
 numDimes++;
 lcd.print("Dime"); 
 delay (200);
 }
 
 if (quarterButtonState == 1){ 
 numQuarters++;
 lcd.print("Quarter"); 
 delay (200);
 }
 
 totalDecimal = numPennies+(numNickels*5)+(numDimes*10)+(numQuarters*25);
 totalDollar = totalDecimal/100;
 decimal = totalDecimal-100*totalDollar;
 
 points=numPennies - (numNickels*5) - (numDimes*10) - (numQuarters*25);
 
 lcd.setCursor (0,1);
 lcd.print ("$");
 
 lcd.print(totalDollar );
 lcd.print(".");
 
 if(decimal < 10)
 {
 lcd.print("0");
 }

 lcd.print(decimal);
 
 lcd.setCursor (8,0);
 lcd.print(points);
 lcd.print(" pts");
 
}