Summary - Operators

Combine arithmetic, comparison and logical operators to write a grade calculator.

Summary - Operators

In this group you learned Java operators:

Arithmetic: +, -, *, /, %
Comparison: ==, !=, <, >, <=, >=
Logical: &&, ||, !
Bitwise: &, |, ^, ~, <<, >>
Assignment/increment: =, +=, ++, --

Now combine them and write a grade calculator.

Exercise Compute a grade

Write a Main class with a main method. Assign 60 to int midterm and 80 to int finalGrade. Assign (midterm + finalGrade) / 2 to int average. Print average with println.

Show example solution

public class Main {
    public static void main(String[] args) {
        int midterm = 60;
        int finalGrade = 80;
        int average = (midterm + finalGrade) / 2;
        System.out.println(average);
    }
}

Tips

A few tips from this group:

Integer division gives an integer; use double for decimals.
== compares, = assigns; do not mix them.
Use && and || for logic, & and | for bitwise.
++x increments first, x++ increments after.
Use bitwise operators only when you really need them.

These basics are needed for conditionals and loops.

Exercise Check status with logical and

Write a Main class with a main method. Assign 25 to int age. Assign age >= 18 && age <= 65 to boolean inRange. Print inRange with println.

Show example solution

public class Main {
    public static void main(String[] args) {
        int age = 25;
        boolean inRange = age >= 18 && age <= 65;
        System.out.println(inRange);
    }
}

Test yourself

Match the operator families

+, -, *, /

Arithmetic
==, !=

Comparison
&&, ||

Logical
&, |

Bitwise

Complete the comparison operator

boolean passed = average ____ 50;

Show answer

boolean passed = average >= 50;

Next lesson: length and charAt

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