Java Tutorial: Data Type of Expressions & Increment/Decrement Operators

Resulting data type after arithmetic operation

• Result = byte + short -> integer
• Result = short + integer -> integer
• Result = long + float -> float
• Result = integer + float -> float
• Result = character + integer -> integer
• Result = character + short -> integer
• Result = long + double -> double
• Result = float + double -> double

Increment and Decrement operators

• a++, ++a (Increment Operators)
• a--, --a (Decrement Operators)

These will operate on all data types except Booleans.

Quick Quiz: Try increment and decrement operators on a Java variable

• a++ -> first use the value and then increment
• ++a -> first increment the value then use it

Quick Quiz: What will be the value of the following expression(x).

1. int y=7;
2. int x = ++y*8;
3. value of x?
4. char a = ‘B’;
5. a++; (a is not ‘C’)

Code:

package com.company;

public class resulting_data_type {
    public static void main(String[] args) {
        /* byte x = 5;
        int y = 6;
        short z = 8;
        int a = y + z;
        float b = 6.54f + x;
        System.out.println(b); */

        // Increment and Decrement Operators
        int i = 56;
        // int b = i++; // first b is assigned i (56) then i is incremented
        int j = 67;
        int c = ++j; // first j is incremented then c is assigned j (68)
        System.out.println(i++);
        System.out.println(i);
        System.out.println(++i);
        System.out.println(i);
        int y = 7;
        System.out.println( ++y *8);
        char ch = 'a';
        System.out.println(++ch);
    }
}

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