{"id":1088,"date":"2026-05-31T01:44:29","date_gmt":"2026-05-30T16:44:29","guid":{"rendered":"https:\/\/nangchang.nes.or.kr\/?p=1088"},"modified":"2026-05-31T01:44:29","modified_gmt":"2026-05-30T16:44:29","slug":"2%ed%8e%b8-%eb%b3%80%ec%88%98%c2%b7%ec%83%81%ec%88%98%c2%b7%ea%b8%b0%eb%b3%b8-%ed%83%80%ec%9e%85-int-double-string-bool-%ec%99%84%ec%a0%84-%ec%a0%95%eb%a6%ac","status":"publish","type":"post","link":"https:\/\/nangchang.nes.or.kr\/?p=1088","title":{"rendered":"[2\ud3b8] \ubcc0\uc218\u00b7\uc0c1\uc218\u00b7\uae30\ubcf8 \ud0c0\uc785 \u2014 Int, Double, String, Bool \uc644\uc804 \uc815\ub9ac"},"content":{"rendered":"
\n

\ud83e\udd16 \uc774 \uae00\uc740 Claude Code<\/a>(AI)\uac00 \uc791\uc131\ud569\ub2c8\ub2e4. | \uc2dc\ub9ac\uc988 \ubaa9\ucc28<\/a> | \uc774\uc804: 1\ud3b8<\/a><\/p>\n<\/blockquote>\n

1\ud3b8\uc5d0\uc11c var<\/code>\uc640 let<\/code>, \ud0c0\uc785 \ucd94\ub860\uc744 \uac04\ub2e8\ud788 \uc0b4\ud3b4\ubd24\uc2b5\ub2c8\ub2e4. \uc774\ubc88 \ud3b8\uc5d0\uc11c\ub294 \uac19\uc740 \ub0b4\uc6a9\uc744 \ub354 \uae4a\uc774 \ud30c\uace0\ub4ed\ub2c8\ub2e4. Swift\uc758 \uae30\ubcf8 \ud0c0\uc785\uc774 Python\uc774\ub098 JavaScript\uc758 \uadf8\uac83\uacfc \uc5b4\ub5bb\uac8c \ub2e4\ub978\uc9c0, \uadf8\ub9ac\uace0 \uc65c \uadf8\ub807\uac8c \uc124\uacc4\ub410\ub294\uc9c0\ub97c \uc774\ud574\ud558\ub294 \uac83\uc774 \ubaa9\ud45c\uc785\ub2c8\ub2e4.<\/p>\n

\n

let<\/code>\uc774 \uae30\ubcf8\uc774\uc5b4\uc57c \ud558\ub294 \uc774\uc720<\/h2>\n

1\ud3b8\uc5d0\uc11c var<\/code>\ub294 \ubcc0\uc218, let<\/code>\uc740 \uc0c1\uc218\ub77c\uace0 \ubc30\uc6e0\uc2b5\ub2c8\ub2e4. Swift \uacf5\uc2dd \uac00\uc774\ub4dc\ub77c\uc778\uc740 \uac12\uc774 \ubc14\ub014 \ud544\uc694\uac00 \uc5c6\ub2e4\uba74 \ud56d\uc0c1 let<\/code>\uc744 \uc4f0\ub77c<\/strong>\uace0 \uad8c\uc7a5\ud569\ub2c8\ub2e4. \ucc98\uc74c\uc5d4 \ub2e4\uc18c \uadc0\ucc2e\uac8c \ub290\uaef4\uc9c0\ub294 \uc774 \uc6d0\uce59\uc5d0\ub294 \uc774\uc720\uac00 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

\ucf54\ub4dc\uac00 \ubcf5\uc7a1\ud574\uc9c8\uc218\ub85d “\uc774 \ubcc0\uc218\uac00 \uc9c0\uae08 \uc5b4\ub5a4 \uac12\uc744 \uac16\uace0 \uc788\uc9c0?”\ub77c\ub294 \ucd94\uc801\uc774 \uc5b4\ub824\uc6cc\uc9d1\ub2c8\ub2e4. \ubcc0\uc218\uac00 \uc5ec\ub7ec \uacf3\uc5d0\uc11c \ubcc0\uacbd\ub420 \uc218 \uc788\ub2e4\uba74 \ubc84\uadf8\ub97c \ucc3e\uae30\ub3c4 \ud798\ub4e4\uc5b4\uc9d1\ub2c8\ub2e4. let<\/code>\uc73c\ub85c \uc120\uc5b8\ub41c \uac12\uc740 \uc120\uc5b8 \uc2dc\uc810 \uc774\ud6c4\uc5d0 \uc808\ub300 \ubc14\ub00c\uc9c0 \uc54a\ub294\ub2e4\ub294 \ubcf4\uc7a5\uc774 \uc0dd\uae30\uace0, \uc774 \ubcf4\uc7a5\uc774 \ucf54\ub4dc\ub97c \uc77d\ub294 \uc0ac\ub78c\uc5d0\uac8c \uc2e0\ub8b0\ub97c \uc90d\ub2c8\ub2e4.<\/p>\n

let maxRetries = 3         \/\/ \uc774 \uac12\uc740 \uc808\ub300 \ubc14\ub00c\uc9c0 \uc54a\ub294\ub2e4\nvar currentRetry = 0      \/\/ \uc774 \uac12\uc740 \ubc18\ubcf5\ud558\uba74\uc11c \ubc14\ub010\ub2e4\n<\/code><\/pre>\n
\ucf54\ub4dc\ub97c \uc77d\ub294 \uc0ac\ub78c\uc740 let<\/code>\uc744 \ubcf4\ub294 \uc21c\uac04 “\uc774 \uac12\uc740 \ucd94\uc801\ud560 \ud544\uc694\uac00 \uc5c6\ub2e4”\uace0 \ud310\ub2e8\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\uac83\uc774 \ucf54\ub4dc \uac00\ub3c5\uc131\uc5d0 \uc9c1\uc811\uc801\uc73c\ub85c \uae30\uc5ec\ud569\ub2c8\ub2e4.<\/p>\n
Xcode\ub3c4 \uc774 \uc6d0\uce59\uc744 \uac15\uc81c\ud569\ub2c8\ub2e4. var<\/code>\ub85c \uc120\uc5b8\ud588\uc9c0\ub9cc \uac12\uc774 \ud55c \ubc88\ub3c4 \ubcc0\uacbd\ub418\uc9c0 \uc54a\uc73c\uba74, \ucef4\ud30c\uc77c\ub7ec\uac00 \uacbd\uace0\ub97c \ud45c\uc2dc\ud558\uba70 let<\/code>\uc73c\ub85c \ubc14\uafb8\ub77c\uace0 \uc81c\uc548\ud569\ub2c8\ub2e4.<\/p>\n
\n
\ub124 \uac00\uc9c0 \uae30\ubcf8 \ud0c0\uc785<\/h2>\n
Int \u2014 \uc815\uc218<\/h3>\n
\uc18c\uc218\uc810 \uc5c6\ub294 \uc22b\uc790\uc785\ub2c8\ub2e4.<\/p>\n
let age = 30\nlet temperature = -5\nlet population = 51_000_000  \/\/ \ubc11\uc904\ub85c \uc790\ub9bf\uc218 \uad6c\ubd84 \uac00\ub2a5 (\uac12\uc5d0 \uc601\ud5a5 \uc5c6\uc74c)\n<\/code><\/pre>\n
Swift\uc758 Int<\/code>\ub294 \uc2e4\ud589 \uc911\uc778 \uae30\uae30\uc758 \uc544\ud0a4\ud14d\ucc98\uc5d0 \ub530\ub77c \ud06c\uae30\uac00 \uc790\ub3d9\uc73c\ub85c \uacb0\uc815\ub429\ub2c8\ub2e4. \uc694\uc998 Mac\uacfc iPhone\uc740 \ubaa8\ub450 64\ube44\ud2b8\uc774\ubbc0\ub85c Int<\/code>\ub294 Int64<\/code>\uc640 \uac19\uc2b5\ub2c8\ub2e4. \ud45c\ud604 \uac00\ub2a5\ud55c \ubc94\uc704\ub294 \uc57d \u22129.2\uc870 ~ +9.2\uc870\ub85c \uc77c\ubc18\uc801\uc778 \uc815\uc218 \uc5f0\uc0b0\uc5d0\uc11c \ub118\uce60 \uc77c\uc774 \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n
\ud2b9\uc815 \ud06c\uae30\uac00 \ud544\uc694\ud560 \ub54c\ub294 \uba85\uc2dc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4(Int8<\/code>, Int16<\/code>, Int32<\/code>, Int64<\/code>). \ud558\uc9c0\ub9cc \ud2b9\ubcc4\ud55c \uc774\uc720\uac00 \uc5c6\ub2e4\uba74 \uadf8\ub0e5 Int<\/code>\ub97c \uc501\ub2c8\ub2e4.<\/p>\n
Double \u2014 \ubd80\ub3d9\uc18c\uc218\uc810 \uc218<\/h3>\n
\uc18c\uc218\uc810\uc774 \uc788\ub294 \uc22b\uc790\uc785\ub2c8\ub2e4.<\/p>\n
let pi = 3.14159\nlet height = 172.5\nlet tiny = 0.000_001\n<\/code><\/pre>\n
Swift\uc5d0\ub294 Double<\/code>(64\ube44\ud2b8, \uc57d 15\uc790\ub9ac \uc815\ubc00\ub3c4)\uacfc Float<\/code>(32\ube44\ud2b8, \uc57d 7\uc790\ub9ac \uc815\ubc00\ub3c4)\uac00 \uc788\uc2b5\ub2c8\ub2e4. \ud2b9\ubcc4\ud55c \uc774\uc720\uac00 \uc5c6\ub2e4\uba74 Double<\/code>\uc744 \uc501\ub2c8\ub2e4. Apple \uacf5\uc2dd API\ub3c4 \ub300\ubd80\ubd84 Double<\/code>\uc744 \uae30\uc900\uc73c\ub85c \uc124\uacc4\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
Bool \u2014 \ucc38\u00b7\uac70\uc9d3<\/h3>\n
\ub17c\ub9ac\uac12\uc785\ub2c8\ub2e4. true<\/code> \uc544\ub2c8\uba74 false<\/code>, \ub531 \ub450 \uac00\uc9c0\ub9cc \uac00\uc9c8 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
let isLoggedIn = true\nlet hasError = false\n<\/code><\/pre>\n
Swift\uc758 Bool<\/code>\uc740 \ub2e4\ub978 \ud0c0\uc785\uacfc \uc808\ub300 \ud63c\uc6a9\ub418\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. C\ub098 Python\uc5d0\uc11c\ub294 0<\/code>\uc774 false<\/code>\ub85c, \ube48 \ubb38\uc790\uc5f4\uc774 false<\/code>\ub85c \ucde8\uae09\ub418\ub294 \uc554\ubb35\uc801 \ubcc0\ud658\uc774 \uc788\uc9c0\ub9cc, Swift\uc5d0\uc11c\ub294 \uadf8\ub7f0 \uac83\uc774 \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n
let count = 0\nif count {  \/\/ \uc624\ub958: Int\ub294 Bool\uc774 \uc544\ub2d8\n    print(\"\ube44\uc5b4 \uc788\uc74c\")\n}\n\nif count == 0 {  \/\/ \uc62c\ubc14\ub978 \ubc29\uc2dd\n    print(\"\ube44\uc5b4 \uc788\uc74c\")\n}\n<\/code><\/pre>\n
String \u2014 \ubb38\uc790\uc5f4<\/h3>\n
\ud14d\uc2a4\ud2b8\ub97c \ub2f4\ub294 \ud0c0\uc785\uc785\ub2c8\ub2e4. Swift\uc758 String<\/code>\uc740 \ucc98\uc74c\ubd80\ud130 \uc720\ub2c8\ucf54\ub4dc \uc644\uc804 \uc9c0\uc6d0<\/strong>\uc744 \uc804\uc81c\ub85c \uc124\uacc4\ub410\uc2b5\ub2c8\ub2e4. \ud55c\uad6d\uc5b4, \uc774\ubaa8\uc9c0, \uc544\ub78d\uc5b4 \ub4f1 \uc5b4\ub5a4 \ubb38\uc790\ub3c4 String<\/code> \ud558\ub098\ub85c \ucc98\ub9ac\ud569\ub2c8\ub2e4.<\/p>\n
let greeting = \"\uc548\ub155\ud558\uc138\uc694\"\nlet emoji = \"Swift \ud83d\ude80\"\nlet empty = \"\"\n<\/code><\/pre>\n
\uc5ec\ub7ec \uc904 \ubb38\uc790\uc5f4\uc740 \ud070\ub530\uc634\ud45c \uc138 \uac1c(\"\"\"<\/code>)\ub85c \uac10\uc309\ub2c8\ub2e4.<\/p>\n
let message = \"\"\"\n\uc548\ub155\ud558\uc138\uc694.\n\uc624\ub298 \ub0a0\uc528\uac00 \uc88b\ub124\uc694.\n\"\"\"\n<\/code><\/pre>\n
\n
\ubb38\uc790\uc5f4 \ubcf4\uac04 \u2014 \\()<\/code><\/h2>\n
\ubb38\uc790\uc5f4 \uc548\uc5d0 \ubcc0\uc218\ub098 \ud45c\ud604\uc2dd\uc758 \uac12\uc744 \uc0bd\uc785\ud560 \ub54c\ub294 \\()<\/code> \ubb38\ubc95\uc744 \uc501\ub2c8\ub2e4.<\/p>\n
let name = \"\ucca0\uc218\"\nlet age = 25\n\nprint(\"\uc774\ub984: \\(name), \ub098\uc774: \\(age)\")\n\/\/ \ucd9c\ub825: \uc774\ub984: \ucca0\uc218, \ub098\uc774: 25\n\nprint(\"10\ub144 \ud6c4\uc5d4 \\(age + 10)\uc0b4\")\n\/\/ \ucd9c\ub825: 10\ub144 \ud6c4\uc5d4 35\uc0b4\n<\/code><\/pre>\n
\uad04\ud638 \uc548\uc5d0\ub294 \ub2e8\uc21c \ubcc0\uc218\ubfd0 \uc544\ub2c8\ub77c \uc5b4\ub5a4 \ud45c\ud604\uc2dd\ub3c4 \ub123\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4. Python\uc758 f-string, JavaScript\uc758 \ud15c\ud50c\ub9bf \ub9ac\ud130\ub7f4\uacfc \uac19\uc740 \uc5ed\ud560\uc785\ub2c8\ub2e4.<\/p>\n
\n
\ud0c0\uc785 \ubcc0\ud658 \u2014 \uc554\ubb35\uc801 \ubcc0\ud658\uc774 \uc5c6\ub294 \uc774\uc720<\/h2>\n
Swift\uc5d0\uc11c\ub294 \uc11c\ub85c \ub2e4\ub978 \ud0c0\uc785 \uc0ac\uc774\uc758 \uc5f0\uc0b0\uc774 \uc790\ub3d9\uc73c\ub85c \uc774\ub8e8\uc5b4\uc9c0\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n
let a: Int = 10\nlet b: Double = 3.14\n\nlet result = a + b  \/\/ \uc624\ub958: Int\uc640 Double\uc744 \ub354\ud560 \uc218 \uc5c6\uc74c\n<\/code><\/pre>\n
Python\uc774\ub77c\uba74 10 + 3.14<\/code>\ub294 \uc790\ub3d9\uc73c\ub85c 13.14<\/code>\uac00 \ub429\ub2c8\ub2e4. Swift\ub294 \uc774\ub97c \ud5c8\uc6a9\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \ub300\uc2e0 \uba85\uc2dc\uc801\uc73c\ub85c \ubcc0\ud658\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n
let result = Double(a) + b  \/\/ 13.14 \u2014 Int\ub97c Double\ub85c \uba85\uc2dc \ubcc0\ud658\n<\/code><\/pre>\n
\ubc88\uac70\ub85c\uc6cc \ubcf4\uc774\uc9c0\ub9cc \uc774 \uc81c\uc57d\uc5d0\ub3c4 \uc774\uc720\uac00 \uc788\uc2b5\ub2c8\ub2e4. \uc554\ubb35\uc801 \ubcc0\ud658\uc740 \ub54c\ub85c \uc608\uc0c1\uce58 \ubabb\ud55c \uc815\ubc00\ub3c4 \uc190\uc2e4\uc774\ub098 \uc624\ubc84\ud50c\ub85c\ub97c \uc77c\uc73c\ud0b5\ub2c8\ub2e4. Swift\ub294 \uadf8 \uc120\ud0dd\uc744 \ud504\ub85c\uadf8\ub798\uba38\uac00 \uc758\uc2dd\uc801\uc73c\ub85c \ud558\ub3c4\ub85d \uc694\uad6c\ud569\ub2c8\ub2e4.<\/p>\n
\uc790\uc8fc \uc4f0\ub294 \ubcc0\ud658 \ud328\ud134\uc744 \uc815\ub9ac\ud569\ub2c8\ub2e4.<\/p>\n
\/\/ \uc22b\uc790 \u2192 \ubb38\uc790\uc5f4\nlet n = 42\nlet s = String(n)       \/\/ \"42\"\n\n\/\/ \ubb38\uc790\uc5f4 \u2192 \uc22b\uc790 (\uc2e4\ud328\ud560 \uc218 \uc788\uc73c\ubbc0\ub85c \uc635\uc154\ub110 \ubc18\ud658)\nlet parsed = Int(\"42\")  \/\/ Optional(42)\nlet failed = Int(\"abc\") \/\/ nil\n\n\/\/ Int \u2194 Double\nlet d = Double(n)       \/\/ 42.0\nlet i = Int(3.99)       \/\/ 3 (\uc18c\uc218\uc810 \ubc84\ub9bc)\n<\/code><\/pre>\n
Int(\"42\")<\/code>\uac00 Optional(42)<\/code>\ub97c \ubc18\ud658\ud558\ub294 \uc774\uc720\ub294 \ubb38\uc790\uc5f4\uc774 \uc22b\uc790\uac00 \uc544\ub2d0 \uc218\ub3c4 \uc788\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4. \uc635\uc154\ub110\uc740 7\ud3b8\uc5d0\uc11c \uc790\uc138\ud788 \ub2e4\ub8e8\uc9c0\ub9cc, \uc9c0\uae08\uc740 “\ubcc0\ud658\uc774 \uc2e4\ud328\ud560 \uc218\ub3c4 \uc788\ub2e4\ub294 \uc2e0\ud638”\ub85c\ub9cc \uc774\ud574\ud574\ub3c4 \ucda9\ubd84\ud569\ub2c8\ub2e4.<\/p>\n
\n
\ud0c0\uc785 \uba85\uc2dc\uac00 \ud544\uc694\ud55c \uacbd\uc6b0<\/h2>\n
\ub300\ubd80\ubd84\uc740 \ud0c0\uc785 \ucd94\ub860\uc5d0 \ub9e1\uae30\uba74 \ub429\ub2c8\ub2e4. \ud558\uc9c0\ub9cc \ub2e4\uc74c \uacbd\uc6b0\uc5d0\ub294 \ud0c0\uc785\uc744 \uba85\uc2dc\ud558\ub294 \uac83\uc774 \uc88b\uc2b5\ub2c8\ub2e4.<\/p>\n
\/\/ 1. \ucd08\uae30\uac12 \uc5c6\uc774 \uc120\uc5b8\ud560 \ub54c\nvar score: Int\nscore = 100  \/\/ \ub098\uc911\uc5d0 \uac12 \ub300\uc785\n\n\/\/ 2. \ucd94\ub860\ub418\ub294 \ud0c0\uc785\uc774 \uc6d0\ud558\ub294 \ud0c0\uc785\uacfc \ub2e4\ub97c \ub54c\nlet ratio = 1 \/ 3          \/\/ Int \ub098\ub217\uc148 \u2192 0\nlet ratio: Double = 1 \/ 3  \/\/ \uc5ec\uc804\ud788 0 (Int \ub9ac\ud130\ub7f4\ub07c\ub9ac \ub098\ub217\uc148)\nlet ratio = 1.0 \/ 3.0      \/\/ Double \u2192 0.333...  \u2190 \uc774\ub807\uac8c \uc4f0\ub294 \uac83\uc774 \uc77c\ubc18\uc801\n\n\/\/ 3. \ucf54\ub4dc\ub97c \uc77d\ub294 \uc0ac\ub78c\uc5d0\uac8c \ud0c0\uc785\uc744 \uba85\ud655\ud788 \uc54c\ub824\uc8fc\uace0 \uc2f6\uc744 \ub54c\nlet maxFileSize: Int64 = 1_073_741_824  \/\/ Int64\uc784\uc744 \uac15\uc870\n<\/code><\/pre>\n
\n
\ub2e4\ub978 \uc5b8\uc5b4\uc640 \ube44\uad50<\/h2>\n\n\n\n\n\n\n\n\n\n\n
<\/th>\nPython<\/th>\nJavaScript<\/th>\nSwift<\/th>\n<\/tr>\n<\/thead>\n
\uc815\uc218<\/td>\nint<\/code> (\ud06c\uae30 \ubb34\uc81c\ud55c)<\/td>\nnumber<\/code><\/td>\nInt<\/code> (64\ube44\ud2b8)<\/td>\n<\/tr>\n
\uc18c\uc218<\/td>\nfloat<\/code><\/td>\nnumber<\/code><\/td>\nDouble<\/code> \/ Float<\/code><\/td>\n<\/tr>\n
\ubb38\uc790\uc5f4<\/td>\nstr<\/code><\/td>\nstring<\/code><\/td>\nString<\/code><\/td>\n<\/tr>\n
\ucc38\u00b7\uac70\uc9d3<\/td>\nbool<\/code> (0<\/code>\ub3c4 False<\/code>)<\/td>\nboolean<\/code> (falsy \uac1c\ub150 \uc788\uc74c)<\/td>\nBool<\/code> (\uc624\uc9c1 true<\/code>\/false<\/code>)<\/td>\n<\/tr>\n
\uc554\ubb35\uc801 \ud615\ubcc0\ud658<\/td>\n\uc788\uc74c<\/td>\n\uc788\uc74c (==<\/code> vs ===<\/code>)<\/td>\n\uc5c6\uc74c<\/td>\n<\/tr>\n
\ubb38\uc790\uc5f4 \ubcf4\uac04<\/td>\nf\"{name}\"<\/code><\/td>\n`${name}`<\/code><\/td>\n\"\\(name)\"<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n
\ud575\uc2ec \uc694\uc57d<\/h2>\n