Question

Write a java calculator program that perform the following operations:
1. function to Addition of two numbers
2. function to Subtraction of two numbers
3. function to Multiplication of two numbers
4. function to Division of two numbers
5. function to Modulus (a % b)
6. function to Power (a b )
7. function to Square root of ()
8. function to Factorial of a number (n!)
9. function to Log(n)
10. function to Sin(x)
11. function to Absolute value (|x|)
12. function to Average of given numbers in array
Notes:
I. Use switch statement to select the required operation and invoke its appropriate method.
II. You should validate the input data before invoking any operation.
III. You should use different types of loops like (for, while, do…..while)

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
_________________

// OperationsOnNumbers.java

import java.util.Scanner;

public class OperationsOnNumbers {
   /*
   * Creating an Scanner class object which is used to get the inputs
   * entered by the user
   */
   static Scanner sc = new Scanner(System.in);
   public static void main(String[] args) {
       int a, b, choice;

       while (true) {
           displayMenu();
           // Getting the input entered by the user
           System.out.print("Enter Choice :");
           choice = sc.nextInt();
           switch (choice) {
           case 1: {
               a=getValidNumber();
               b=getValidNumber();
               System.out.println(a+" + "+b+" = "+(a+b));
               continue;
           }
           case 2: {
               a=getValidNumber();
               b=getValidNumber();
               System.out.println(a+" - "+b+" = "+(a-b));
               continue;
           }
           case 3: {
               a=getValidNumber();
               b=getValidNumber();
               System.out.println(a+" * "+b+" = "+(a*b));
               continue;
           }
           case 4: {
               a=getValidNumber();
               b=getValidNumber();
               System.out.println(a+" / "+b+" = "+(a/b));
               continue;
           }
           case 5: {
               a=getValidNumber();
               b=getValidNumber();
               System.out.println(a+" % "+b+" = "+(a%b));
               continue;
           }
           case 6: {
               a=getValidNumber();
               b=getValidNumber();
               System.out.println(a+" ^ "+b+" = "+(Math.pow(a,b)));
               continue;
           }
           case 7: {
               a=getValidNumber();
               System.out.println("Square Root of "+a+" = "+(Math.sqrt(a)));
               continue;
           }
           case 8: {
               a=getValidNumber();
               System.out.println("Factorial of "+a+" = "+factorial(a));
               continue;
           }
           case 9: {
               a=getValidNumber();
               System.out.println("Log("+a+") = "+Math.log(a));
               continue;
           }
           case 10: {
               a=getValidNumber();
               System.out.println("Sin("+a+") = "+Math.sin(a));
               continue;
           }
           case 11: {
               System.out.print("Enter a number :");
               a=sc.nextInt();
               System.out.println("Absolute of ("+a+") = "+Math.abs(a));          
               continue;
           }
           case 12: {
               int arr[]=new int[5];
               for(int i=0;i<arr.length;i++)
               {
                   System.out.print("Enter a number#"+(i+1)+":");
                   arr[i]=sc.nextInt();
               }
               System.out.println("Average of array numbers :"+calcAvg(arr));
               continue;
           }
           case 13: {
               break;
           }

           default: {
               System.out.println("** Invalid Choice **");
               continue;
           }

           }
           break;
       }

   }

   private static double calcAvg(int[] arr) {
       double sum=0;
       for(int i=0;i<arr.length;i++)
       {
           sum+=arr[i];
       }
       return (sum/arr.length);
   }

   private static long factorial(int a) {
long fact = 1;
do {
fact = fact * a;
a--;
} while (a > 0);
return fact;
   }

   private static int getValidNumber() {
       int num;
       while(true)
       {
           System.out.print("Enter a number :");
           num=sc.nextInt();
           if(num<0)
           {
               System.out.println("** Invalid.Must be positive number **");
           }
           else
               break;
       }
       return num;
   }

   private static void displayMenu() {

       System.out.println("\n1.function to Addition of two numbers");
       System.out.println("2. function to Subtraction of two numbers");
       System.out.println("3. function to Multiplication of two numbers");
       System.out.println("4. function to Division of two numbers");
       System.out.println("5. function to Modulus (a % b)");
       System.out.println("6. function to Power (a b )");
       System.out.println("7. function to Square root of ()");
       System.out.println("8. function to Factorial of a number (n!)");
       System.out.println("9. function to Log(n)");
       System.out.println("10. function to Sin(x)");
       System.out.println("11. function to Absolute value (|x|)");
       System.out
               .println("12. function to Average of given numbers in array)");
       System.out.println("13.Exit");
   }

}
____________________________

Output:

1.function to Addition of two numbers
2. function to Subtraction of two numbers
3. function to Multiplication of two numbers
4. function to Division of two numbers
5. function to Modulus (a % b)
6. function to Power (a b )
7. function to Square root of ()
8. function to Factorial of a number (n!)
9. function to Log(n)
10. function to Sin(x)
11. function to Absolute value (|x|)
12. function to Average of given numbers in array)
13.Exit
Enter Choice :1
Enter a number :3
Enter a number :4
3 + 4 = 7

1.function to Addition of two numbers
2. function to Subtraction of two numbers
3. function to Multiplication of two numbers
4. function to Division of two numbers
5. function to Modulus (a % b)
6. function to Power (a b )
7. function to Square root of ()
8. function to Factorial of a number (n!)
9. function to Log(n)
10. function to Sin(x)
11. function to Absolute value (|x|)
12. function to Average of given numbers in array)
13.Exit
Enter Choice :4
Enter a number :8
Enter a number :2
8 / 2 = 4

1.function to Addition of two numbers
2. function to Subtraction of two numbers
3. function to Multiplication of two numbers
4. function to Division of two numbers
5. function to Modulus (a % b)
6. function to Power (a b )
7. function to Square root of ()
8. function to Factorial of a number (n!)
9. function to Log(n)
10. function to Sin(x)
11. function to Absolute value (|x|)
12. function to Average of given numbers in array)
13.Exit
Enter Choice :5
Enter a number :9
Enter a number :2
9 % 2 = 1

1.function to Addition of two numbers
2. function to Subtraction of two numbers
3. function to Multiplication of two numbers
4. function to Division of two numbers
5. function to Modulus (a % b)
6. function to Power (a b )
7. function to Square root of ()
8. function to Factorial of a number (n!)
9. function to Log(n)
10. function to Sin(x)
11. function to Absolute value (|x|)
12. function to Average of given numbers in array)
13.Exit
Enter Choice :8
Enter a number :5
Factorial of 5 = 120

1.function to Addition of two numbers
2. function to Subtraction of two numbers
3. function to Multiplication of two numbers
4. function to Division of two numbers
5. function to Modulus (a % b)
6. function to Power (a b )
7. function to Square root of ()
8. function to Factorial of a number (n!)
9. function to Log(n)
10. function to Sin(x)
11. function to Absolute value (|x|)
12. function to Average of given numbers in array)
13.Exit
Enter Choice :12
Enter a number#1:5
Enter a number#2:6
Enter a number#3:7
Enter a number#4:8
Enter a number#5:9
Average of array numbers :7.0

1.function to Addition of two numbers
2. function to Subtraction of two numbers
3. function to Multiplication of two numbers
4. function to Division of two numbers
5. function to Modulus (a % b)
6. function to Power (a b )
7. function to Square root of ()
8. function to Factorial of a number (n!)
9. function to Log(n)
10. function to Sin(x)
11. function to Absolute value (|x|)
12. function to Average of given numbers in array)
13.Exit
Enter Choice :13

_______________Could you plz rate me well.Thank You