public class Main01 {

public static void main(String[] args) {

System.out.println("\nmian fang fa...hello world!");

for (String x : args) {

System.out.println(x);

if ("-version".equals(x)) {

System.out.println("no version yet");

}

}

Main01.int_type();

Main01.double_type();

Main01.char_type();

Main01.boolean_type_op();

Main01.trans_type();

Main01.basic_operator();

}

private static void int_type() {

System.out.println("\n#int_type");

byte b = 127; // -128 ~ 127

short s = 32767; // -32768 ~ 32767

int i = 2147483647; // -2147483648 ~ 2147483647

long l = -9_223_372_036_854_775_808L; // -9,223,372,036,854,775,808 ~ 9,223,372,036,854,775,807

System.out.println("##byte/short/int/long type");

System.out.println(b);

System.out.println(s);

System.out.println(i);

System.out.println(l);

System.out.println("##binary/octal/decimal/Hexadecimal");

System.out.println(0b1000000000); // 512

System.out.println(01000); // 512

System.out.println(512);

System.out.println(0x200); // 512

System.out.println("##Integer.toString()");

System.out.println(Integer.toBinaryString(512));

System.out.println(Integer.toOctalString(512));

System.out.println(Integer.toString(512));

System.out.println(Integer.toHexString(512));

}

private static void double_type() {

System.out.println("\n#double_type");

double x1 = 2.33;

float x2 = 2.33f;

System.out.println(x1);

System.out.println(x2);

System.out.println(2.33e0);

System.out.println(2.33E1);

System.out.println(233_233.233_233);

}

private static void char_type() {

System.out.println("\n#char_type");

System.out.println('a');

// System.out.println(char 61);

System.out.println('\u0061');

}

private static void boolean_type_op() {

System.out.println("\n#boolean_type_op");

boolean x1 = true, x2 = false;

System.out.println(x1);

System.out.println(x2);

System.out.println(!true);

System.out.println(false && (1 / 0 > 0));

System.out.println(true || (1 / 0 > 0));

System.out.println(true ? -233 : 233);

int x3 = 9, x4 = 13;

System.out.println("x3: " + Integer.toBinaryString(x3));

System.out.println("x4: " + Integer.toBinaryString(x4));

System.out.println("~x3: " + Integer.toBinaryString(~x3));

System.out.println("x3&x4: " + Integer.toBinaryString(x3&x4));

System.out.println("x3|x4: " + Integer.toBinaryString(x3|x4));

System.out.println("x3^x4: " + Integer.toBinaryString(x3^x4));

System.out.println("x3<<1: " + Integer.toBinaryString(x3<<1));

System.out.println("x3>>1: " + Integer.toBinaryString(x3>>1));

}

private static void trans_type() {

System.out.println("\n#trans_type");

System.out.println((int) (3.2 + 0.5));

System.out.println((int) 1e20);

System.out.println((int) -1e20);

}

private static void basic_operator() {

System.out.println("\n#basic_operator");

System.out.println("##divide /");

System.out.println(100 / 9);

System.out.println(100.0 / 9);

System.out.println(100 / 9.0);

System.out.println("##percent %");

System.out.println(3 % 2);

System.out.println(4 % 2);

System.out.println(3.0 % 2);

System.out.println(4%3);

System.out.println(4%-3);

System.out.println(-4%3);

System.out.println(-4%-3);

}

}