Example of JAVA Program

1. Example of JAVA Program

import java.util.Scanner;

import javax.swing.JOptionPane;

public class AsburyTrentonAnArrayCalc {

public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner keyboard = new Scanner(System.in);

int choice, count = 0, counter = 0, done = 0, sizeArray = 0;

do {

choice = getMenuOption();

// SWITCH WILL SELECT WHICH TASK TO PERFORM

switch(choice){

// ADDING
case 1:
double[] num1 = new double[sizeArray];
double[] num2 = new double[sizeArray];
double[] total = new double[sizeArray];

double aNum1, aNum2, aTotal;

System.out.println("How many values are in the
arrays: ");
sizeArray = keyboard.nextInt();

// ADDS JUST 1 SET OF NUMBERS
if (sizeArray == 1){
aNum1 = getOperand("what is the 1st number to
add: ");
aNum2 = getOperand("what is the 2nd number
to add: ");

aTotal = aNum1 + aNum2;

System.out.println(aNum1 + " + " + aNum2 + " =
" + aTotal);
System.out.println("");

2. }

// ADDS MULTIPLE SETS OF NUMBERS
else{
num1 = getOperand("Enter the values in the first
array, seperated by spaces: ", sizeArray);
num2 = getOperand("Enter the values in the second
array, seperated by spaces: ", sizeArray);

total = add(num1, num2);

if (counter != 0){
counter = 0;
}

System.out.print("The result is [");

for (int i = 0; i < num1.length - 1; i++){
System.out.print(total[i] + ", ");
count = i;
}

System.out.print(total[count + 1] + "]");
System.out.println();
System.out.println();
}

break;

// SUBTRACTING
case 2:

double[] num3 = new double[sizeArray];
double[] num4 = new double[sizeArray];
double[] total2 = new double[sizeArray];

double sNum1 = 0, sNum2 = 0, sTotal = 0;

System.out.println("How many values are in the
arrays: ");
sizeArray = keyboard.nextInt();

// SUBTRACT JUST 1 SET OF NUMBE RS
if (sizeArray == 1){

3. sNum1 = getOperand("what is the 1st number to
subtract: ");
sNum2 = getOperand("what is the 2nd number
to subtract: ");

sTotal = sNum1 - sNum2;

System.out.println(sNum1 + " - " + sNum2 + " = "
+ sTotal);
System.out.println("");

}

// SUBTRACT MULTIPLE SETS OF NUMBERS
else{
num3 = getOperand("Enter the values in the first
array, seperated by spaces: ", sizeArray);
num4 = getOperand("Enter the values in the second
array, seperated by spaces: ", sizeArray);

total2 = subtract(num3, num4);

if (counter != 0){
counter = 0;
}

System.out.print("The result is [");

for (int i = 0; i < num3.length - 1; i++){
System.out.print(total2[i] + ", ");
count = i;
}

System.out.print(total2[count + 1] + "]");
System.out.println();
System.out.println();
}

break;

// MULTIPLYING
case 3:
double[] num5 = new double[sizeArray];
double[] num6 = new double[sizeArray];
double[] total3 = new double[sizeArray];

4. double mNum1 = 0, mNum2 = 0, mTotal = 0;

System.out.println("How many values are in the
arrays: ");
sizeArray = keyboard.nextInt();

// MULTIPLY JUST 1 SET OF NUMBERS
if (sizeArray == 1){
mNum1 = getOperand("what is the 1st number
to multiply: ");
mNum2 = getOperand("what is the 2nd number
to multiply: ");

mTotal = mNum1 * mNum2;

System.out.println(mNum1 + " * " + mNum2 + "
= " + mTotal);
System.out.println("");

}

// MULTIPLY MULTIPLE SETS OF NUMBERS
else{
num5 = getOperand("Enter the values in the first
array, seperated by spaces: ", sizeArray);
num6 = getOperand("Enter the values in the second
array, seperated by spaces: ", sizeArray);



total3 = multiply(num5, num6);

if (counter != 0){
counter = 0;
}

System.out.print("The result is [");

for (int i = 0; i < num5.length - 1; i++){
System.out.print(total3[i] + ", ");
count = i;
}

System.out.print(total3[count + 1] + "]");
System.out.println();
System.out.println();

5. }

break;

// DIVIDING
case 4:
boolean dom = true;
double[] num7 = new double[sizeArray];
double[] num8 = new double[sizeArray];
double[] total4 = new double[sizeArray];

double dNum1, dNum2, dTotal;

System.out.println("How many values are in the
arrays: ");
sizeArray = keyboard.nextInt();

// DIVIDE JUST 1 SET OF NUMBERS
if (sizeArray == 1){
dNum1 = getOperand("what is the 1st number to
divide: ");
dNum2 = getOperand("what is the 2nd number
to divide: ");

// DENOMINATOR = 0, THIS WILL TRIGGER A
ERROR MESSAGE
if (dNum2 > 0){

dTotal = dNum1 / dNum2;

System.out.println(dNum1 + " / " + dNum2 + " =
" + dTotal);
System.out.println("");
}
else{
System.out.println("Sorry you can't divide
by 0!!");
System.out.println();
}

}

// DIVIDE MULTIPLE SETS OF NUMBERS
else{

6. num7 = getOperand("Enter the values in the first
array, seperated by spaces: ", sizeArray);
num8 = getOperand("Enter the values in the second
array, seperated by spaces: ", sizeArray);

// DENOMINATOR = 0, THIS WILL TRIGGER A
ERROR MESSAGE
for (int i = 0; i < num8.length; i++){
if (num8[i] < 1){
dom = false;
}
}

if (dom == true){
total4 = divide(num7, num8);

System.out.print("The result is [");

for (int i = 0; i < num7.length - 1; i++){
System.out.print(total4[i] + ", ");
count = i;
}

System.out.print(total4[count + 1] + "]");
System.out.println();
System.out.println();
}

else{
System.out.println("Sorry you can't divide by
0!!");
System.out.println("");
}
}
if (counter != 0){
counter = 0;
}
if (dom == false){
dom = true;
}
break;

// DOT PRODUCT
case 5:

7. System.out.println("How many values are in the
arrays: ");
sizeArray = keyboard.nextInt();

double[] num9 = new double[sizeArray];
double[] num10 = new double[sizeArray];
double total5;

double pNum1 = 0, pNum2 = 0, pTotal = 0;

// MULTIPLY JUST 1 SET OF NUMBERS
if (sizeArray == 1){
pNum1 = getOperand("what is the 1st number
for dot product: ");
pNum2 = getOperand("what is the 2nd number
for dot product: ");

pTotal = pNum1 * pNum2;

System.out.println("The result is: " + pTotal);
System.out.println();

}

// MULTIPLY MULTIPLE SETS OF NUMBERS
else{
num9 = getOperand("Enter the values in the first
array, seperated by spaces: ", sizeArray);
num10 = getOperand("Enter the values in the second
array, seperated by spaces: ", sizeArray);

total5 = dotProduct(num9, num10);

System.out.print("The result is: " + total5);

System.out.println();
}

if (counter != 0){
counter = 0;
}

break;

case 6:

8. double rNum1 = 0, rNum2 = 0, randNum;
int lnCounter = 0;
System.out.println("How many values are in the
arrays: ");
sizeArray = keyboard.nextInt();

double[] randNums = new double[sizeArray];

// GENERATE RANDOM NUMBER JUST 1 NUMBER
if (sizeArray == 1){
rNum1 = getOperand("what is the lower limit: ");
rNum2 = getOperand("what is the upper limit: ");

randNum = random(rNum1, rNum2);

System.out.println(randNum);
System.out.println("");

}

// GENERATE A SETS OF RANDOM NUMBERS
else{
rNum1 = getOperand("what is the lower limit: ");
rNum2 = getOperand("what is the upper limit: ");

randNums = random(rNum1, rNum2, sizeArray);

// SORT RANDOM NUMBERS

for(int i = 0; i < randNums.length -1; i++){
int smallNum = i;
for(int j = i; j < randNums.length; j++){
if(randNums[j] < randNums[smallNum]){
smallNum = j;
}
}

//SWAP THE SMALLEST NUM WITH THE
LOCATION I
double temp = randNums[i];
randNums[i] = randNums[smallNum];
randNums[smallNum] = temp;

}

System.out.print("The result is");

9. System.out.println();
System.out.print("[");

for (int i = 0; i < sizeArray / 3; i++){
for(int j = 0; j < 3; j++){


System.out.print(randNums[lnCounter] + ", ");
count = i;
lnCounter++;
}
System.out.println();

}

}

System.out.print("]");
System.out.println();
System.out.println();
}


if (counter != 0){
counter = 0;

break;

}

// DISPLAY STATEMENT IF USER PUTS WRONG
NUMBER IN
if (choice > 7 || choice < 1) {
counter++;
System.out.println("I'm sorry, " + choice + "
wasn't one of the options");
System.out.println("");
}

if (counter == 3 || choice == 7){
JOptionPane.showMessageDialog(null, "PLEASE
TRY AGAIN LATER");
break;
}

10. } while(choice != 7);


}


// METHOD TO SHOW THE MENU
public static int getMenuOption(){


Scanner keyboard = new Scanner(System.in);

System.out.println("========= MENU =========");
System.out.println("1. Add");
System.out.println("2. Subtract");
System.out.println("3. Multiply");
System.out.println("4. Divide");
System.out.println("5. Dot Product");
System.out.println("6. Generate Random Array");
System.out.println("7. Exit");
System.out.println("What would you like to do: ");
int choice = keyboard.nextInt();

return choice;
}

public static double[] getOperand(String prompt, int size){
double[] num = new double[size];
Scanner keyboard = new Scanner(System.in);

System.out.println(prompt);

for (int i = 0; i < size; i++){

num[i] = keyboard.nextDouble();
}

return num;
}


public static double getOperand(String prompt){

Scanner keyboard = new Scanner(System.in);

11. System.out.println(prompt);
double num = keyboard.nextDouble();


return num;


}

public static double[] add(double[] operand1, double[] operand2){
double[] total = new double[operand1.length];

for(int i = 0; i < operand1.length; i++){

total[i] = operand1[i] + operand2[i];

}

return total;
}

public static double[] subtract(double[] operand1, double[] operand2){

double[] total = new double[operand1.length];

for(int i = 0; i < operand1.length; i++){

total[i] = operand1[i] - operand2[i];

}

return total;

}

public static double[] multiply(double[] operand1, double[] operand2){

double[] total = new double[operand1.length];

for(int i = 0; i < operand1.length; i++){

total[i] = operand1[i] * operand2[i];

}

return total;

12. }

public static double[] divide(double[] operand1, double[] operand2){

double[] total = new double[operand1.length];

for(int i = 0; i < operand1.length; i++){

total[i] = operand1[i] / operand2[i];

}

return total;

}

public static double[] random(double lowerLimit, double upperLimit, int size){

double[] randNum = new double[size];
int decMult = 100;


for(int i = 0; i < size; i++){
randNum[i] = (double) (Math.random() * decMult + 1);


// KEEPS LOOPING TILL THE RANDOM NUMBER IS BETWEEN THE
// SELECTED NUMBERS BY THE USER
do {

randNum[i] = (double) (Math.random() * decMult + 1);

// THIS WILL CHANGE THE DECIMAL SO THE USER CAN
CHANGE
// ABOVE 100
if (lowerLimit > 100){
decMult = 1000;
}
// THIS WILL CHANGE THE DECIMAL SO THE USER CAN
CHANGE
// ABOVE 1,000
if (lowerLimit > 1000){
decMult = 10000;
}

13. // THIS WILL CHANGE THE DECIMAL SO THE USER CAN
CHANGE
// ABOVE 10,000
if (lowerLimit > 10000){
decMult = 100000;
}

} while (randNum[i] < lowerLimit || randNum[i] > upperLimit);
}

return randNum;
}



public static double random(double lowerLimit, double upperLimit){

int decMult = 100;
double randomNumber = (double) (Math.random() * decMult + 1);


// KEEPS LOOPING TILL THE RANDOM NUMBER IS BETWEEN THE
// SELECTED NUMBERS BY THE USER
do {

randomNumber = (double) (Math.random() * decMult + 1);

// THIS WILL CHANGE THE DECIMAL SO THE USER CAN
CHANGE
// ABOVE 100
if (lowerLimit > 100){
decMult = 1000;
}
// THIS WILL CHANGE THE DECIMAL SO THE USER CAN
CHANGE
// ABOVE 1,000
if (lowerLimit > 1000){
decMult = 10000;
}
// THIS WILL CHANGE THE DECIMAL SO THE USER CAN
CHANGE
// ABOVE 10,000
if (lowerLimit > 10000){
decMult = 100000;
}

14. } while (randomNumber < lowerLimit || randomNumber > upperLimit);

return randomNumber;
}

public static double dotProduct(double[] operand1, double[] operand2){

double total = 0, num = 0;

for(int i = 0; i < operand1.length; i++){

num = operand1[i] * operand2[i];
total += num;

}

return total;

}



}