백준 [2556] Hello World

• std 클래스를 네임스페이스로 사용 std:sout 과 동격
• 출력은 << 입력은 >>

NodeJS

version : v14.15.0

	console.log("Hello World!");

C++

version : 17

#include <iostream>
using namespace std;
int main() {
	cout << "Hello World!" << endl;
	return 0;
}

assembly

version : x86-64 gcc 11.2

.LC0:
        .string "Hello World!"
main:
        push    rbp
        mov     rbp, rsp
        mov     esi, OFFSET FLAT:.LC0
        mov     edi, OFFSET FLAT:_ZSt4cout
        call    std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)
        mov     esi, OFFSET FLAT:_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_
        mov     rdi, rax
        call    std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))
        mov     eax, 0
        pop     rbp
        ret
__static_initialization_and_destruction_0(int, int):
        push    rbp
        mov     rbp, rsp
        sub     rsp, 16
        mov     DWORD PTR [rbp-4], edi
        mov     DWORD PTR [rbp-8], esi
        cmp     DWORD PTR [rbp-4], 1
        jne     .L5
        cmp     DWORD PTR [rbp-8], 65535
        jne     .L5
        mov     edi, OFFSET FLAT:_ZStL8__ioinit
        call    std::ios_base::Init::Init() [complete object constructor]
        mov     edx, OFFSET FLAT:__dso_handle
        mov     esi, OFFSET FLAT:_ZStL8__ioinit
        mov     edi, OFFSET FLAT:_ZNSt8ios_base4InitD1Ev
        call    __cxa_atexit
.L5:
        nop
        leave
        ret
_GLOBAL__sub_I_main:
        push    rbp
        mov     rbp, rsp
        mov     esi, 65535
        mov     edi, 1
        call    __static_initialization_and_destruction_0(int, int)
        pop     rbp
        ret

JAVA

version : 11

import java.util.*;
public class Main{
    public static void main(String args[]){
        System.out.println("Hello World!");
    }
}

assembly

version: Open JDK 16

Main.class

Classfile /tmp/4559304259719885153/classes/Main.class
  Last modified Aug 7, 2021; size 516 bytes
  SHA-256 checksum 4d6f662e03d3304d5e46fcf266c182e838aba95999d4c19afd5b697ed5180ddf
  Compiled from "Main.java"
public class Main
  minor version: 0
  major version: 60
  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: #21                         // Main
  super_class: #2                         // java/lang/Object
  interfaces: 0, fields: 0, methods: 2, attributes: 1
Constant pool:
{
  public Main();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // Main this
         0: aload_0
         1: invokespecial #1                  // Method java/lang/Object."<init>":()V
         4: return
        end local 0 // Main this
      LineNumberTable:
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
            0       5     0  this   LMain;

  public static void main(java.lang.String[]);
    descriptor: ([Ljava/lang/String;)V
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // java.lang.String[] args
         0: getstatic     #7                  // Field java/lang/System.out:Ljava/io/PrintStream;
         3: ldc           #13                 // String Hello World!
         5: invokevirtual #15                 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
         8: return
        end local 0 // java.lang.String[] args
      LineNumberTable:
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
            0       9     0  args   [Ljava/lang/String;
}
SourceFile: "Main.java"