Question

Problem Statement

Write a program that uses the java Math library and implement the functionality of a scientific calculator. Your program should have the following components:
1. A main menu listing all the functionality of the calculator.
2. Your program should use the switch structure to switch between various options of the calculator. Your Program should also have the provision to handle invalidoption selection by the user.
3. Your calculator SHOULD HAVE the following functionalities. You can add any other additional features. PLEASE MAKE SURE YOU USE APPROPRIATE DATA TYPES.
a. Basic Functionality:
i. Add two numbers.
ii. Subtract two numbers.
iii. Divide a number by the second number (Don’t forget to check for the divide by zero error).
iv. Multiply two numbers.
v. Remainder when a number is divided by the second.
b. Scientific Calculations:
i. Ceiling and Floor of a number.
ii. Sine, Cosine and Tangent of an angle given in radians.
iii. x2, x3 and xy (You can display exponents in your program as x^y).
iv. Square root of a non-negative number (add appropriate checks in your program).
v. Logarithm of x base 10, natural logarithm of x base e and exponential function ex
vi. Absolute value of a given number x.
c. Additional Features: a can be done by using simple arithmetic operators. b can be done using the Math library of java. You have to write code to add the followingfeatures to your calculator:
i. Calculate average of arbitrary positive numbers input by the user (Use a loop and an appropriate sentinel value to achieve this task).
ii. Determine if a number is even or odd.
iii. Determine if one number is a multiple of the other.
iv. Factorial of a non-negative integer.

Answer 1

System.out.println("MAIN MENU: ");

System.out.println("1. Add two numbers");

System.out.println("2. Subtract two numbers");

System.out.println("3. Divide a number by the second number");

System.out.println("4. Multiply two numbers");

System.out.println("5. Remainder when a number is divided by the second");

System.out.println("6. Ceiling and Floor of a number");

System.out.println("7. Sine, Cosine and Tangent of an angle given in radians");

System.out.println("8. x^2, x^3 and x^y");

System.out.println("9. Square root of a non-negative number");

System.out.println("10. Logarithm of x base 10, natural logarithm of x base e and exponential function e^x");

System.out.println("11. Absolute value of a given number x");

System.out.println("12. Average of arbitrary positive numbers");

System.out.println("13. Determine if a number is even or odd");

System.out.println("14. Factorial of a non-negative integer");

System.out.println("15. Determine if one number is a multiple of the other");

System.out.println("16. Exit");

System.out.print("Enter your choice: ");

int choice = in.nextInt();

 

switch(choice)

{

case 1: add(in); break;

case 2: subtract(in); break;

case 3: divide(in); break;

case 4: multiply(in); break;

case 5: remainder(in); break;

case 6: fc(in); break;

case 7: sct(in); break;

case 8: power(in); break;

case 9: sqroot(in); break;

case 10: log(in); break;

case 11: absolute(in); break;

case 12: average(in); break;

case 13: modtwo(in); break;

case 14: factorial(in); break;

case 15: multiple(in); break;

case 16: System.out.println("Exiting!! Bye");

return;

default: System.out.println("Invalid option. Exiting!!");

return;

}

}

}

 

public static void add(Scanner in)

{

System.out.print("Enter the 1st number: ");

double n1 = in.nextDouble();

System.out.print("Enter the 2nd number: ");

double n2 = in.nextDouble();

System.out.println("Addition of the 2 numbers is: " + (n1+n2));

}

 

public static void subtract(Scanner in)

{

System.out.print("Enter the 1st number: ");

double n1 = in.nextDouble();

System.out.print("Enter the 2nd number: ");

double n2 = in.nextDouble();

System.out.println("Difference of the 2 numbers is: " + (n1-n2));

}

 

public static void divide(Scanner in)

{

System.out.print("Enter the 1st number: ");

double n1 = in.nextDouble();

System.out.print("Enter the 2nd number: ");

double n2 = in.nextDouble();

if(n2 == 0){System.out.println("Division by 0 not possible"); return;}

System.out.println("Division of the 2 numbers is: " + (n1/n2));

}

 

public static void multiply(Scanner in)

{

System.out.print("Enter the 1st number: ");

double n1 = in.nextDouble();

System.out.print("Enter the 2nd number: ");

double n2 = in.nextDouble();

System.out.println("Multiplication of the 2 numbers is: " + (n1*n2));

}

 

public static void remainder(Scanner in)

{

System.out.print("Enter the 1st integer: ");

int n1 = in.nextInt();

System.out.print("Enter the 2nd integer: ");

int n2 = in.nextInt();

if(n2 == 0){System.out.println("Division by 0 not possible"); return;}

System.out.println("Remainder of division is: " + (n1%n2));

}

 

public static void fc(Scanner in)

{

System.out.print("Enter the number: ");

double n1 = in.nextDouble();

System.out.println("Floor of the number is: " + Math.floor(n1));

System.out.println("Ceiling of the number is: " + Math.ceil(n1));

}

 

public static void sct(Scanner in)

{

System.out.print("Enter theangle (in radians): ");

double n1 = in.nextDouble();

System.out.println("Sine of the angle is: " + Math.sin(n1));

System.out.println("Cos of the angle is: " + Math.cos(n1));

System.out.println("Tan of the angle is: " + Math.tan(n1));

}

 

public static void power(Scanner in)

{

System.out.print("Enter the number x: ");

double n1 = in.nextDouble();

System.out.print("Enter the number y: ");

double n2 = in.nextDouble();

System.out.println("x^2 is: " + Math.pow(n1,2));

System.out.println("x^3 is: " + Math.pow(n1,3));

System.out.println("x^y is: " + Math.pow(n1,n2));

}

 

public static void sqroot(Scanner in)

{

System.out.print("Enter the +ve number x: ");

double n1 = in.nextDouble();

if(n1 < 0) { System.out.println("Invalid Input!"); return; }

System.out.println("Square root of x is: " + Math.sqrt(n1));

}

 

public static void log(Scanner in)

{

System.out.print("Enter the +ve number x: ");

double n1 = in.nextDouble();

System.out.println("Log base e is: " + Math.log(n1));

System.out.println("Log base 10 is: " + Math.log(n1)/Math.log(10));

System.out.println("e^x is: " + Math.exp(n1));

}

 

public static void absolute(Scanner in)

{

System.out.print("Enter the +ve number x: ");

double n1 = in.nextDouble();

 

System.out.println("Absolute Value of x is: " + Math.abs(n1));

}

 

public static void average(Scanner in)

{

System.out.print("Enter the +ve numbers, terminate by -1: ");

double n=0, tot=0;

int count=0;

while(true)

{

n = in.nextDouble();

if (n < 0) break;

tot+=n;

count++;

}

 

System.out.println("Average of the numbers is: " + tot/count);

}

 

public static void modtwo(Scanner in)

{

System.out.print("Enter the integer: ");

int n1 = in.nextInt();

 

if(n1%2 == 1) System.out.println("Number is odd");

else System.out.println("Number is even");

}

 

public static void factorial(Scanner in)

{

System.out.print("Enter the integer: ");

int n1 = in.nextInt();

 

int prod=1;

for(int i=2; i<=n1; i++) prod*=i;

 

System.out.println("Factorial is: " + prod);

 

}

 

public static void multiple(Scanner in)

{

System.out.print("Enter the 1st integer: ");

int n1 = in.nextInt();

System.out.print("Enter the 2nd integer: ");

int n2 = in.nextInt();

if(n2 == 0){System.out.println("Division by 0 not possible"); return;}

 

if(n1%n2 == 0 || n2%n1 == 0) System.out.println("Yes. One number is a multiple of other");

else System.out.println("No. One number is not a multiple of other");

 

}

 

}