\ud83d\udc49\ud83c\udffb \ud3ec\uc778\ud130 \/ Pointer<\/p>\n\n\n\n
\u2714\ufe0f \ubcc0\uc218\uc758 \uc8fc\uc18c \uac12\uc744 \uc800\uc7a5\ud558\ub294 \ubcc0\uc218
A variable that stores the address value of a variable<\/p>\n\n\n\n
\u2714\ufe0f \uc8fc\uc18c\uc5f0\uc0b0\uc790(&)\ub97c \uc0ac\uc6a9\ud558\uba74 \ubcc0\uc218\uc758 \uc8fc\uc18c\ub97c \uac00\uc838\uc62c \uc218 \uc788\uc2b5\ub2c8\ub2e4.
You can get the address of a variable by using the address operator (&).<\/p>\n\n\n\n
string* ptv = &name;<\/code><\/pre>\n\n\n\n\ud83d\udc49\ud83c\udffb\ub124\uc784\uc2a4\ud398\uc774\uc2a4 \/ namespace<\/p>\n\n\n\n
\u2714\ufe0f\uc5ec\ub7ec \ub77c\uc774\ube0c\ub7ec\ub9ac\ub098 \ubaa8\ub4c8\uc744 \ud568\uaed8 \uc0ac\uc6a9\ud560 \ub54c, \ud574\ub2f9 \uc774\ub984\ub4e4\uc744 \uadf8\ub8f9\ud654\ud558\uc5ec \uc11c\ub85c \uac04\uc12d\ud558\uc9c0 \uc54a\ub3c4\ub85d \uaca9\ub9ac\ud558\ub294 \uc5ed\ud560\uc744 \ud569\ub2c8\ub2e4.
When using multiple libraries or modules together, it serves to group their names and isolate them to prevent interference.<\/p>\n\n\n\n
\u2714\ufe0f cout\uc744 \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0 \uc544\ub798\uc5d0\uc11c \ub450\uac00\uc9c0 \ud615\ud0dc\uc758 \ucf54\ub4dc\ub97c \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4.
When using cout, you can see two forms of code below.<\/p>\n\n\n\n
\u2714\ufe0f usiing namespace std; \ub97c \uc0ac\uc6a9\ud558\uba74 “std::” \ub97c \uc0dd\ub7b5 \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.
If you use namespace std; you can omit “std::”.<\/p>\n\n\n\n
— \uccab\ubc88\uc9f8 \/ first<\/p>\n\n\n\n
cout << name << \"\\n\";<\/code><\/pre>\n\n\n\n–\ub450\ubc88\uc9f8 \/ second<\/p>\n\n\n\n
std::cout << \"ftest message\\n\" << std::endl;<\/code><\/pre>\n\n\n\n\ud83d\udc49\ud83c\udffb\ud5e4\ub354 \/ header<\/p>\n\n\n\n
\u2714\ufe0f \uc77c\ubc18\uc801\uc73c\ub85c \ud5e4\ub354\ud30c\uc77c(.h)\uc5d0\ub294 \ucc45\uc758 \ubaa9\ucc28\ucc98\ub7fc \uae30\ub2a5\uc5d0 \ub300\ud55c \ubaa9\ub85d\uc744 \uc815\uc758\ud569\ub2c8\ub2e4.
Generally, header files (.h) define a list of functions, much like a table of contents in a book.<\/p>\n\n\n\n
\u2714\ufe0f cpp\ud30c\uc77c\uc5d0 \uc2e4\uc9c8\uc801\uc740 \uae30\ub2a5\uc744 \uc815\uc758\ud569\ub2c8\ub2e4.
Define the actual functionality in the cpp file.<\/p>\n\n\n\n
\u2714\ufe0f \ud5e4\ub354\ud30c\uc77c\uc5d0 \uae30\ub2a5\uae4c\uc9c0 \uc815\uc758\ud560 \uc218 \uc788\uc9c0\ub9cc \ud2b9\ubcc4\ud55c \uacbd\uc6b0\uac00 \uc544\ub2c8\uba74 \uad8c\uc7a5\ub418\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.
You can define functions in header files, but this is not recommended unless there is a special case.<\/p>\n\n\n\n
\ud83d\udc49\ud83c\udffb\ucf54\ub4dc \/ Code<\/p>\n\n\n\n
\u2714\ufe0f header.h<\/p>\n\n\n\n
\/\/ if not define HEADER_H\n\/\/ -- \ub9cc\uc57d HEADER_H\uc2ec\ubcfc\uc774 \uc815\uc758\ub418\uc5b4 \uc788\uc9c0 \uc54a\uc73c\uba74\n\/\/ If the HEADER_H symbol is not defined\n\/\/ define HEADER_H\n\/\/ -- HEADER_H \uc2ec\ubcfc\uc744 \uc815\uc758\ud55c\ub2e4.\n\/\/ Defines the HEADER_H symbol.\n\/\/\n#ifndef HEADER_H\n#define HEADER_H\n\n\n\/\/ \ub124\uc784\uc2a4\ud398\uc774\uc2a4 \/ namespace\nnamespace my {\n\n \/\/ -- \ud074\ub798\uc2a4\ub97c \uc0ac\uc6a9\ud560 \uacbd\uc6b0 -- \/\n \/\/ -- When using classes -- \/\n \/\/\n \/\/ class Server {\n \/\/ public:\n \/\/ int add(int x, int y)\n \/\/ {\n \/\/ return x + y;\n \/\/ }\n \/\/ };\n\n\n \/\/ -- \uba64\ubc84 \ud568\uc218\ub85c \uc0ac\uc6a9\ud560 \uacbd\uc6b0 -- \/\n \/\/ -- When used as a member function -- \/\n int add(int x, int y)\n {\n return x + y;\n }\n\n}\n\n\/\/ \ud5e4\ub354 \uc0ac\uc6a9\uc5d0 \uad8c\uc7a5\ub418\uc9c0 \uc54a\uc740 \ubc29\uc2dd\n\/\/ Not recommended method for using headers\nvoid ftest(){\n std::cout << \"ftest message\\n\" << std::endl;\n}\n\n\/\/ \ud5e4\ub354 \uc0ac\uc6a9\uc5d0 \uad8c\uc7a5\ub418\ub294 \ubc29\uc2dd\n\/\/ Recommended way to use headers\nvoid message (std::string& msg);\n\n#endif\n<\/code><\/pre>\n\n\n\n\u2714\ufe0f pointer.cpp<\/p>\n\n\n\n
#include <iostream>\n#include <string>\n#include \"header.h\" \/\/ \ud5e4\ub354 \ud3ec\ud568 \/ Includes header\n\nusing namespace std; \/\/ std \ub124\uc784\uc2a4\ud398\uc774\uc2a4 \uc0ac\uc6a9\ud558\uae30 \/ Using the std namespace\n\nvoid message(string& msg){\n cout << msg << \"\\n\" << endl;\n}\n\nstd::string my_message = \"pointer complete!!\";\nint main(){\n\n \/\/ -- \ud5e4\ub354\uc5d0 \ud074\ub798\ub85c \uc120\uc5b8\ub41c \uacbd\uc6b0 \uc0ac\uc6a9 \ud615\uc2dd -- \/\/\n \/\/ -- Usage format when declared as a class in the header -- \/\/\n \/\/ <\ub124\uc784\uc2a4\ud398\uc774\uc2a4>::<\ud074\ub798\uc2a4\ub124\uc784> <\uac1d\uccb4>\n \/\/ my::Server svr;\n \/\/\n\n \/\/ \uc77c\ubc18 string\ubcc0\uc218 \/ General string variable\n\tstring name = \"Ayloy\";\n\n\t\/\/ *ptr => \ud3ec\uc778\ud130\ubcc0\uc218 \/ Pointer Variable\n\t\/\/ &food => \uc77c\ubc18\ubcc0\uc218\uc758 \uc8fc\uc18c \uac12 \/ Address value of a regular variable\n\tstring* ptv = &name;\n\n\t\/\/ \ubcc0\uc218 \ucd9c\ub825 \/. variable output\n\tcout << name << \"\\n\";\n\tcout << &name << \"\\n\";\n\tcout << ptv << \"\\n\";\n\n\t\/\/ print value\n\tcout << *ptv << \"\\n\";\n\n\t\/\/ \ud3ec\uc778\ud130\ubcc0\uc218\uc5d0 \uac12 \ubcc0\uacbd\n\t\/\/ change pointer value\n\t*ptv = \"SilverHand\";\n\tcout << *ptv << \"\\n\";\n\n\t\/\/ \ud5e4\ub354\uc5d0 \ud074\ub798\uc2a4\ub85c\uc120\uc5b8\ub41c \uacbd\uc6b0 \/ When declared as a class in the header\n \/\/cout << \"The sum of 1 and 2 is \" << svr.add(1, 2) << std::endl;\n\n \/\/ \ud5e4\ub354\uc5d0 \uba64\ubc84 \ud568\uc218\ub85c \uc120\uc5b8\ub41c \uacbd\uc6b0 \/ When declared as a member function in the header\n cout << \"The sum of 1 and 2 is \" << my::add(1, 2) << std::endl;\n\n \/\/ ftest\ud568\uc218 \uc2e4\ud589 \/ Excute ftewt function\n ftest();\n \/\/ message\ud568\uc218 \uc2e4\ud589, \ucc38\uc870\ub85c \uc804\ub2ec \/ Execute message function, passed by reference\n message(my_message);\n\treturn 0;\n}\n<\/code><\/pre>\n\n\n\n\u2714\ufe0f \ucef4\ud30c\uc77c \/ Compiling<\/p>\n\n\n\n
g++ pointer.cpp -o pointer -std=c++17<\/code><\/pre>\n\n\n\n\u2714\ufe0f\uc2e4\ud589 \/ Run<\/p>\n\n\n\n
.\/pointer<\/code><\/pre>\n\n\n\n\u2714\ufe0f \uacb0\uacfc \/ Results<\/p>\n\n\n\n
Ayloy\n0x16cf4f0e0\n0x16cf4f0e0\nAyloy\nSilverHand\nThe sum of 1 and 2 is 3\nftest message\n\npointer complete!!\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\ud83d\udc49\ud83c\udffb \ud3ec\uc778\ud130 \/ Pointer \u2714\ufe0f \ubcc0\uc218\uc758 \uc8fc\uc18c \uac12\uc744 \uc800\uc7a5\ud558\ub294 \ubcc0\uc218A variable that stores the address value of a variable \u2714\ufe0f \uc8fc\uc18c\uc5f0\uc0b0\uc790(&)\ub97c \uc0ac\uc6a9\ud558\uba74 \ubcc0\uc218\uc758 \uc8fc\uc18c\ub97c \uac00\uc838\uc62c \uc218 \uc788\uc2b5\ub2c8\ub2e4.You can get the address of a variable by using the address operator (&). \ud83d\udc49\ud83c\udffb\ub124\uc784\uc2a4\ud398\uc774\uc2a4 \/ namespace \u2714\ufe0f\uc5ec\ub7ec \ub77c\uc774\ube0c\ub7ec\ub9ac\ub098 \ubaa8\ub4c8\uc744 \ud568\uaed8 \uc0ac\uc6a9\ud560 \ub54c, \ud574\ub2f9 \uc774\ub984\ub4e4\uc744 \uadf8\ub8f9\ud654\ud558\uc5ec \uc11c\ub85c \uac04\uc12d\ud558\uc9c0 \uc54a\ub3c4\ub85d […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,1],"tags":[],"class_list":["post-5435","post","type-post","status-publish","format-standard","hentry","category-cpp","category-uncategorized","missing-thumbnail"],"_links":{"self":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/5435","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/comments?post=5435"}],"version-history":[{"count":4,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/5435\/revisions"}],"predecessor-version":[{"id":5439,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/5435\/revisions\/5439"}],"wp:attachment":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/media?parent=5435"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/categories?post=5435"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/tags?post=5435"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}