what happen if + or - with Char

what happen if + or - with Char

  2월 03, 2022    Eunhan's library

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Result

char type + int type = return unicode
char type - int type = error
int type + char type = return unicode
int type - char type = error
char type + char type = return unicode
char type - char type = return unicode

• String is not Primitive Data Type. This is object

Test

public class Main {
    public static void main(String[] args) {

        String temp="apple";
        char a = 'A';// unicode 65
        char b = 'B';// unicode 66
        System.out.println(a); // A
        System.out.println(a+0); // 65
        System.out.println(a-b); // -1
        System.out.println(a + 5); // 70
        System.out.println(5 + a);// 70
        System.out.println(5 + a+temp); //70apple
//      System.out.println("a - 5->"+a - 5);
//error: java: bad operand types for binary operator '-'
//      System.out.println("5 - a->"+5 - a);
//error: java: bad operand types for binary operator '-'
        System.out.println(a + temp.charAt(1));//177
        System.out.println(temp.charAt(1)+a);//177
        System.out.println(a + a);//130
        System.out.println(a + temp);//Aapple

    }
}

example of use

For lexicographical order

for (int i = 0; i < order.length(); ++i)
            index[order.charAt(i) - 'a'] = i;

Primitive Data Types

According to Primitive Data Types Java API

The Java programming language is statically-typed, which means that all variables must first be declared before they can be used. This involves stating the variable's type and name, as you've already seen:

int gear = 1;

Doing so tells your program that a field named "gear" exists, holds numerical data, and has an initial value of "1". A variable's data type determines the values it may contain, plus the operations that may be performed on it. In addition to int, the Java programming language supports seven other primitive data types. A primitive type is predefined by the language and is named by a reserved keyword. Primitive values do not share state with other primitive values. The eight primitive data types supported by the Java programming language are:

char:

The char data type is a single 16-bit Unicode character. It has a minimum value of '\u0000' (or 0) and a maximum value of '\uffff' (or 65,535 inclusive).