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๐Ÿ“š๊ฐœ๋ฐœ ๋ณต์Šต ๋…ธํŠธ

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java(57)

  • ์ด์ค‘๋ฐ˜๋ณต๋ฌธ

    ์ถœ๋ ฅ์„ ์•„๋ž˜์™€ ๊ฐ™์ด ํ•˜๊ณ  ์‹ถ๋‹ค๋ฉด ***** ***** ***** ***** ***** ๋จผ์ € ์ฒซ์ค„ *๋ฅผ ๊ฐ€๋กœ๋กœ 5๊ฐœ ๋ฐ˜๋ณตํ•ด์•ผ ํ•จ. for(int i = 0; i < 5 ; i++) { System.out.print("*"); } ์œ„ ์ฝ”๋“œ๋ฅผ ๋‹ค์„ฏ๋ฒˆ ๋ฐ˜๋ณตํ•ด์•ผํ•˜๊ธฐ ๋•Œ๋ฌธ์— Ctrl+X๋ฅผ ๋ˆŒ๋Ÿฌ ์ž˜๋ผ๋‚ธ๋‹ค. ๊ทธ๋ฆฌ๊ณ  ์ „์ฒด๋ฅผ x๋กœ ์ž ์‹œ ๋‘” ํ›„ ๊ทธ x๋ฅผ for๋ฌธ ์•ˆ์— ๋„ฃ์–ด์ฃผ๋Š” ์ž‘์—…์„ ํ•˜๋ฉด ๋จ. (์‹ค๋ฌด์—์„œ๋Š” ์ด๋ ‡๊ฒŒ ์‚ฌ์šฉ x ) ๋‹จ์ˆœ ์ดํ•ด๋ฅผ ๋•๊ธฐ ์œ„ํ•œ ์ž‘์—… for(int j = 0 ; j < 5 ; j++) { for(int i = 0; i < 5 ; i++) { System.out.print("*"); } System.out.println(); } ๋ฐ˜๋ณต๋ฌธ ์ž‘์„ฑํ•œ ํ›„ x๋ฅผ ๋‹ค์‹œ Ctrl+v๋กœ ๋‹ค์‹œ ์›๋ž˜ ์ƒํƒœ๋กœ ๋Œ๋ ค์ฃผ๋ฉด ์ดํ•ดํ•˜๊ธฐ..

    2023.01.25
  • ๋ฐฐ์—ด ๋ฌธ์ œ ํ’€๊ธฐ

    ** ๋ณ€์ˆ˜์˜ ์ค‘๋ณต ๊ฐ€๋Šฅ ๊ฒฝ์šฐ { } - ์ž๋ฐ”์˜ ์˜์—ญ์„ ํ‘œ์‹œ ๋™์ผํ•œ ์˜์—ญ์—์„œ์˜ ๋ณ€์ˆ˜๋Š” ์ค‘๋ณต ๋ถˆ๊ฐ€๋Šฅ ๋‹ค๋ฅธ ์˜์—ญ์—์„œ๋Š” ๋ณ€์ˆ˜ ์ค‘๋ณต ๊ฐ€๋Šฅ for(int e : arr) { System.out.println(e); for๋ฌธ ์•ˆ์˜ ( )์—์„œ ๋ณ€์ˆ˜๋Š” ์˜†์˜ { }๊นŒ์ง€๊ฐ€ ์˜์—ญ์ž„. public class ๋ฐฐ์—ด๋ฌธ์ œ1_1 { public static void main(String[] args) { int[] arr1 = new int[3]; double[] arr2 = new double[5]; String[] arr3 = new String[10]; int[] arr4 = {1, 5, 10}; String[] arr5 = {"์ž๋ฐ”", "c์–ธ์–ด", "ํŒŒ์ด์ฌ"}; } } public class ๋ฐฐ์—ด๋ฌธ์ œ1_5 { public st..

    2023.01.20
  • ๋ฐฐ์—ด(Array)

    ์ž๋ฃŒํ˜•์ด ๋™์ผํ•œ ๋ณ€์ˆ˜๊ฐ€ ๋งŽ์ด ํ•„์š”ํ•  ๋•Œ ๋‹ค์ˆ˜์˜ ๋ณ€์ˆ˜๋ฅผ ํšจ์œจ์ ์œผ๋กœ ๊ด€๋ฆฌํ•˜๊ธฐ ์œ„ํ•œ ์ž๋ฃŒํ˜• ์šฐ๋ฆฌ๊ฐ€ ์•„๋Š” ๋ชจ๋“  ์ž๋ฃŒํ˜•์€ ๋ชจ๋‘ ๋ฐฐ์—ด๋กœ ์‚ฌ์šฉ์ด ๊ฐ€๋Šฅ (๋ฐฐ์—ด์ด ์ž๋ฃŒํ˜• 1๊ฐœ ๋ผ๋Š” ๋œป์ด ์•„๋‹ˆ๋ผ int [] , double[] ๋‹ค ๊ฐ๊ฐ 1๊ฐœ ์ž๋ฃŒํ˜•์ด๋‹ค.) ex) int๋Š” ๋ฐ์ดํ„ฐ(์ •์ˆ˜) ํ•˜๋‚˜๋งŒ ์ €์žฅ - ๋ฐฐ์—ด์€ ๊ฐ™์€ ์ž๋ฃŒํ˜• ์—ฌ๋Ÿฌ๊ฐœ(1๊ฐœ๋„ ํฌํ•จ) ์ €์žฅ ๊ฐ€๋Šฅ int a; int c; a=c ๊ฐ€๋Šฅ int [] b; a=b ๋ถˆ๊ฐ€๋Šฅ ๋ฐฐ์—ด์˜ ์„ ์–ธ ์ž๋ฃŒํ˜•[ ] arr1 int[] arr1; ๋™์ผ โ†• ๊ทธ๋Ÿฌ๋‚˜ ์ฒซ๋ฒˆ์งธ๋กœ ์“ฐ๋Š” ๊ฑธ ์ถ”์ฒœ int arr1[] ๋ณ€์ˆ˜๋ฅผ ์„ ์–ธํ•˜๊ณ  ์ดˆ๊ธฐํ™” ํ•˜๋“ฏ์ด ๋ฐฐ์—ด๋„ ๋™์ผํ•œ ์ž‘์—…์ด ํ•„์š” = ๋ฐฐ์—ด ์ƒ์„ฑ์ด๋ผ ํ•œ๋‹ค. ๋ฐฐ์—ด์˜ ์ƒ์„ฑ arr1 = new int[5]; //์ •์ˆ˜ 5๊ฐœ๋ฅผ ์ €์žฅํ•  ์ˆ˜ ์žˆ๋Š” ๋ฐฐ์—ด arr1 0 0 0 0 0..

    2023.01.20
  • ๋ฐ˜๋ณต๋ฌธ ๋ฌธ์ œ ํ’€๊ธฐ2

    public class ๋ฐ˜๋ณต๋ฌธ๋ฌธ์ œ2_1 { public static void main(String[] args) { int i = 0; for(int j = 0; j < 10 ; j++);//๋ช…๋ น์–ด ๋์— ; ์žˆ๊ธฐ ๋•Œ๋ฌธ์— ๋ช…๋ น์–ด ๋๋‚จ for๋ฌธ ์ž‘๋™ x i = i + 1; // i = 1 ๋‚˜์˜ด //์•„๋ž˜์™€ ๊ฐ™์ด ๊ณ ์ณ์•ผ ํ•จ // int i = 0; // for(int j = 0; j < 10 ; j++) // i = i + 1; //10 ๋‚˜์˜ด }//๋ฐ˜๋ณตํ•ด์•ผ ํ•  ์‹คํ–‰๋ฌธ์ด ํ•œ ์ค„์ด๋ฉด {} ์ƒ๋žต๊ฐ€๋Šฅ } public class ๋ฐ˜๋ณต๋ฌธ๋ฌธ์ œ2_2 { public static void main(String[] args) { int i = 0; while (i < 100) { i = i + 2; } System.out.pri..

    2023.01.19
  • infiniteroof (๋ฌดํ•œ ๋ฃจํ”„)

    ํ†ต์ƒ์ ์œผ๋กœ ๋ฌดํ•œ๋ฃจํ”„๋Š” while ์‚ฌ์šฉ ๊ทธ๋Ÿฌ๋‚˜ for๋ฌธ๋„ ๊ฐ€๋Šฅํ•˜๋‹ค. while๋ฌธ ๋ฌดํ•œ๋ฃจํ”„ ๋ฌธ๋ฒ• : while(true) { } for๋ฌธ ๋ฌดํ•œ๋ฃจํ”„ ๋ฌธ๋ฒ• : for(; ;) { } ์ฃผ์„ ํŒ ctrl + // ๋ฌดํ•œ๋ฃจํ”„์™€ break ์‚ฌ์šฉํ•ด๋ณด์ž. import java.util.Scanner; public class InfiniteRoof02 { public static void main(String[] args) { //์ ์ˆ˜๋ฅผ ์ž…๋ ฅ๋ฐ›๋Š”๋ฐ ์ ์ˆ˜๊ฐ€ 0~100 ์‚ฌ์ด์˜ ์ˆ˜๋ฅผ ๋ฐ›์„ ๋™์•ˆ //๊ณ„์†ํ•ด์„œ ์ ์ˆ˜๋ฅผ ์ž…๋ ฅ ๋ฐ›๋Š” ์ฝ”๋“œ Scanner sc = new Scanner(System.in); int score; while (true) { System.out.print("์ ์ˆ˜ ์ž…๋ ฅ : "); score = sc.nextInt();..

    2023.01.19
  • break์™€ continue

    public class Break01 { public static void main(String[] args) { //๋งŒ์•ฝ์— ๋ฐ˜๋ณต๋ฌธ(for, while) ์•ˆ์— break๊ฐ€ ์‹คํ–‰๋˜๋ฉด //๋ฐ”๋กœ โ˜…๋ฐ˜๋ณต๋ฌธโ˜…์„ ๋ฒ—์–ด๋‚œ๋‹ค. for(int i = 0 ; i < 6 ; i++) { System.out.println(i); if(i == 3) { break; } } } } ์‹คํ–‰๋ฌธ ์œ„์น˜๋ฅผ ๋ฐ”๊ฟ”๋ณด์ž public class Break01 { public static void main(String[] args) { //๋งŒ์•ฝ์— ๋ฐ˜๋ณต๋ฌธ(for, while) ์•ˆ์— break๊ฐ€ ์‹คํ–‰๋˜๋ฉด //๋ฐ”๋กœ โ˜…๋ฐ˜๋ณต๋ฌธโ˜…์„ ๋ฒ—์–ด๋‚œ๋‹ค. for(int i = 0 ; i < 6 ; i++) { if(i == 3) { break; } System.out.p..

    2023.01.19
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