JAVA : Ex. 2 Answer - Calculator in Plaintext Code
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(N.B. Save this class by the name Calculatorx.java to compile and run)

import java.util.Scanner;
public class Calculatorx{

public static void main(String args[]){

double result;

Scanner opr_in = new Scanner(System.in);

System.out.println("Enter the fist no. :");
double num1 = opr_in.nextDouble();

System.out.println("Enter the second no. :");
double num2 = opr_in.nextDouble();

System.out.println("Insert Operation + - * /:");
string oper_x = opr_in.nexLine();

switch(oper_x){
case “+”:
result = num1 + num2;
break;
case “-“:
result = num1 - num2;
break;
case “*”:
result = num1 * num2;
break;
case “/“:
result = num1/num2;
break;
default:
System.out.println("the operator is not set correctly!");
break;
}

System.put.println("the result is" + result);

opr_in.close();

}
}
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AI Programming @freecodecs
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Tip : If it doesn’t work or needs initializing
Just edit line 4 by (double result = 0;)
N.B. The code is without the parenthesis

Q#1. Write a menu driven program which allows a user to
A. Insert
B. Delete
C. Display details of a single student
D. Display all students
⏱ If any one want us to do Data Structure Assignment show some hand 🤚

Doubly Linked (Student Registration)
- Data Structure - Assignment
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AI Programming @freecodecs
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Q#2. Write a student registration program by using doubly linked data structure way in C++
A. Insert Student Record
B. Insert in the Middle of Records
C. Delete Student (* also last record)
D. Display all Students
E. Display Single Student
F. Display Student Record Reverse

⏱ We need at list 400 🤚 (vote hands) to do this Assignment.

Doubly Linked List (Student Registration)
- Data Structure - Q#2
• Insert
• Insert After Record
• Delete
• Display All
• Display Single
• Display Reverse
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AI Programming @freecodecs
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Infix to Postfix & Evaluate Using Stack C++
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Implementation of infix equation/expression to postfix expression converter and evaluator by using stack data structure method.

(N.B. We use stack class from library by calling #include <stack>, which is the same as doing inside our project by declaring function called pop & push.)
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AI Programming @freecodecs
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~~ Difference between C and C++ ~~
The major difference between C and C++ is that C is a procedural programming language and😭 does not support classes and objects, while😏 C++ is a combination of both procedural and object oriented programming language; therefore C++ can be called a hybrid language.

AI Programming @freecodecs
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Java -Exercises
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Below are some java basics exercise source codes to help you practice the methods and little syntax’s.
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