Relational operators in Java - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of relational operators with integers

What is the output of this Java code snippet?

Java

public class Main {
    public static void main(String[] args) {
        int a = 5;
        int b = 10;
        System.out.println(a > b);
        System.out.println(a <= b);
    }
}

A false\nfalse

B true\nfalse

C false\ntrue

D true\ntrue

💡 Hint

Remember that 5 is less than 10, so a > b is false.

Since 5 is not greater than 10, a > b is false. Since 5 is less than or equal to 10, a <= b is true.

❓ Predict Output

intermediate

Relational operators with characters

What will this Java program print?

Java

public class Main {
    public static void main(String[] args) {
        char x = 'A';
        char y = 'a';
        System.out.println(x < y);
        System.out.println(x == y);
    }
}

A false\nfalse

B false\ntrue

C true\ntrue

D true\nfalse

💡 Hint

Characters are compared by their Unicode values.

The Unicode value of 'A' (65) is less than 'a' (97), so x < y is true. They are not equal, so x == y is false.

❓ Predict Output

advanced

Relational operators with floating-point numbers

What is the output of this Java code?

Java

public class Main {
    public static void main(String[] args) {
        double d1 = 0.1 + 0.2;
        double d2 = 0.3;
        System.out.println(d1 == d2);
        System.out.println(d1 > d2);
    }
}

A false\ntrue

B false\nfalse

C true\ntrue

D true\nfalse

💡 Hint

Floating-point arithmetic can cause precision issues.

Due to floating-point precision, 0.1 + 0.2 is not exactly 0.3 but slightly larger, so d1 == d2 is false and d1 > d2 is true.

❓ Predict Output

advanced

Relational operators with boolean values

What will this Java program print?

Java

public class Main {
    public static void main(String[] args) {
        boolean b1 = true;
        boolean b2 = false;
        System.out.println(b1 == b2);
        System.out.println(b1 != b2);
    }
}

A false\ntrue

B true\nfalse

C false\nfalse

D true\ntrue

💡 Hint

Boolean values can be compared with == and != operators.

b1 is true and b2 is false, so b1 == b2 is false and b1 != b2 is true.

❓ Predict Output

expert

Relational operators with mixed types and casting

What is the output of this Java code?

Java

public class Main {
    public static void main(String[] args) {
        int i = 10;
        double d = 10.0;
        System.out.println(i == d);
        System.out.println(i >= d);
        System.out.println((double) i > d);
    }
}

A eslafn\eurtn\eurt

B true\ntrue\nfalse

C rue\ntrue\nfalse

D true\ntrue\nfals

💡 Hint

When comparing int and double, int is promoted to double.

i == d is true because 10 equals 10.0. i >= d is true for the same reason. (double) i > d is false because 10.0 is not greater than 10.0.