[C์–ธ์–ด] ๋ฐฐ์—ด๊ณผ ํฌ์ธํ„ฐ(3)

2025. 11. 26. 22:47ยท๐Ÿ› ๏ธBackend/โš™๏ธC

โœ… 1. ํฌ์ธํ„ฐ์™€ ๋ฐฐ์—ด

  • C ์–ธ์–ด์—์„œ๋Š” ๋ฌธ์ž์—ด์„ ๋ณ€์ˆ˜์— ์ €์žฅํ•˜๋Š” ๋ฐฉ๋ฒ•์ด ํฌ๊ฒŒ ๋ฌธ์ž ๋ฐฐ์—ด, ๋ฌธ์ž ํฌ์ธํ„ฐ ๋‘ ๊ฐ€์ง€ ๋ฐฉ์‹์œผ๋กœ ๋‚˜๋‰จ.

(1) ๋ฌธ์ž์—ด๊ณผ ํฌ์ธํ„ฐ - ๋ฌธ์ž ํฌ์ธํ„ฐ ๋ฐฉ์‹

[ ๋ฌธ์ž ํฌ์ธํ„ฐ ๋ฐฉ์‹ ]

  • ๋ฌธ์ž ํฌ์ธํ„ฐ ๋ฐฉ์‹์€ ๋ฌธ์ž์—ด์„ ๋ฌธ์ž์—ด ์ƒ์ˆ˜๋กœ ์ €์žฅ์„ ํ•œ๋‹ค.
  • ์ฆ‰, ํฌ์ธํ„ฐ๊ฐ€ ๊ฐ€๋ฆฌํ‚ค๋Š” ๋Œ€์ƒ์ด ์ƒ์ˆ˜์ด๋ฏ€๋กœ, ํ•ด๋‹น ํฌ์ธํ„ฐ๋ฅผ ์ด์šฉํ•ด์„œ ๋ฌธ์ž์—ด์˜ ๋‚ด์šฉ์„ ์ˆ˜์ •ํ•  ์ˆ˜ ์—†์Œ.
  • ๊ฒฐ๊ณผ์ ์œผ๋กœ ๋ฌธ์ž์—ด ๋ฆฌํ„ฐ๋Ÿด์€ ์ฝ๊ธฐ ์ „์šฉ ๋ฉ”๋ชจ๋ฆฌ์— ์ €์žฅ์ด ๋˜๋Š”์…ˆ์ž„.

[ ๋ฌธ์ž ํฌ์ธํ„ฐ ์˜ˆ์‹œ ]

  • ํฌ์ธํ„ฐ๊ฐ€ ๊ฐ€๋ฆฌํ‚ค๋Š” ๊ณณ์€ ๋ฌธ์ž์—ด์˜ ์ฒซ ๋ฒˆ์งธ ์š”์†Œ์ด๋ฉฐ, ๋ฐ˜๋ณต๋ฌธ๊ณผ ํฌ์ธํ„ฐ ์—ฐ์‚ฐ์„ ํ†ตํ•ด ๋ฌธ์ž์—ด์„ ์ถœ๋ ฅ ํ•  ์ˆ˜ ์žˆ์Œ.

(2) ๋ฌธ์ž์—ด๊ณผ ํฌ์ธํ„ฐ - ๋ฐฐ์—ด ๋ฐฉ์‹

  • ๋ฌธ์žํ˜• ๋ฐฐ์—ด์„ ๋งŒ๋“ค๋ฉด์„œ, ๋ฆฌํ„ฐ๋Ÿด ๋ฐฉ์‹์œผ๋กœ ๋ฌธ์ž์—ด์„ ๋„ฃ์–ด์„œ ๋ฐฐ์—ด์„ ์ดˆ๊ธฐํ™” ํ•  ์ˆ˜ ์žˆ์Œ.
  • ์œ„์™€ ๊ฐ™์ด ํฌ์ธํ„ฐ ๋ณ€์ˆ˜๋ฅผ ์„ ์–ธํ•ด ๋ฐฐ์—ด ๋ณ€์ˆ˜๋ฅผ ๋„ฃ๊ฒŒ ๋˜๋ฉด, ํ•ด๋‹น ๋ฐฐ์—ด์˜ ์ œ์ผ ์ฒซ ๋ฒˆ์งธ ์ฃผ์†Œ๊ฐ’์„ ๋„ฃ์–ด์ฃผ๊ฒŒ ๋œ๋‹ค.

[ ํฌ์ธํ„ฐ๋ฅผ ํ™œ์šฉํ•œ ๋ฐฐ์—ด ์ฐธ์กฐ ]

  • ํ•ด๋‹น ๋ฐฐ์—ด์„ ์„ ์–ธํ•œ ๋ณ€์ˆ˜๋Š” ์ž์ฒด๋งŒ์œผ๋กœ ์ฒซ ๋ฒˆ์งธ ์ธ๋ฑ์Šค์˜ ์ฃผ์†Œ๊ฐ’์„ ๊ฐ€์ง€๊ณ  ์žˆ์–ด, ํฌ์ธํ„ฐ ๋ณ€์ˆ˜์— ํ• ๋‹น์ด ๊ฐ€๋Šฅํ•จ.
  • ์ดํ›„, ํฌ์ธํ„ฐ ์—ฐ์‚ฐ์„ ํ†ตํ•ด ๋ฐฐ์—ด์˜ ๋‹ค์Œ ์ฃผ์†Œ๊ฐ’์„ ์ฐธ์กฐํ•˜๋Š” ์‹์œผ๋กœ ๋ฐฐ์—ด์˜ ๋ฐ์ดํ„ฐ๋ฅผ ๊บผ๋‚ผ ์ˆ˜ ์žˆ์Œ.

(3) ๋ฌธ์ž์—ด๊ณผ ํฌ์ธํ„ฐ - 2์ฐจ์› ๋ฐฐ์—ด ์ฐธ์กฐ

  • 2์ฐจ์› ๋ฐฐ์—ด์€ ๊ธฐ์กด์˜ 1์ฐจ์› ๋ฐฐ์—ด์ฒ˜๋Ÿผ ํฌ์ธํ„ฐ ๋ณ€์ˆ˜์— ํ• ๋‹น์„ ํ•ด์ฃผ๋ฉด ์˜ค๋ฅ˜๊ฐ€ ๋‚จ.
  • ์ด์œ ๋Š”, ๊ธฐ์กด 1์ฐจ์› ๋ฐฐ์—ด์—์„œ ๋ฐฐ์—ด ๋ณ€์ˆ˜๋ช…๋งŒ์œผ๋กœ ์ฒซ ๋ฒˆ์งธ ์ฃผ์†Œ๊ฐ’์„ ์–ป์—ˆ์ง€๋งŒ, 2์ฐจ์› ๋ฐฐ์—ด์—์„œ๋Š” ๋ฐฐ์—ด ์ฃผ์†Œ๊ฐ’๋งŒ์œผ๋กœ๋Š” ์ฒซ ๋ฒˆ์งธ ์ฃผ์†Œ๊ฐ’์„ ์–ป์ง€ ๋ชปํ•จ. ๊ทธ๋ž˜์„œ, a[0] ( a๋Š” 1์ฐจ์› ๋ฐฐ์—ด ์ฒซ ๋ฒˆ์งธ ์›์†Œ ๋’ค์— 0์„ ๋„ฃ์–ด 2์ฐจ์› ๋ฐฐ์—ด๊นŒ์ง€ ํฌํ•จ์„ ์‹œํ‚ด ) ๋ช…๋ น์–ด๋ฅผ ์จ์•ผ์ง€ ๋ฐฐ์—ด์˜ ์ฃผ์†Œ๊ฐ’์„ ํฌ์ธํ„ฐ ๋ณ€์ˆ˜์— ํ• ๋‹น ํ•  ์ˆ˜ ์žˆ์Œ.
  • ์ฆ‰, ๋ฌผ๋ฆฌ์  ๊ตฌ์กฐ๋ฅผ ๋ณด๋ฉด a ์ž์ฒด๋Š” a[0] ์„ ๊ฐ€๋ฆฌํ‚ค๊ธฐ ๋•Œ๋ฌธ์— 2์ฐจ์› ๋ฐฐ์—ด์—์„œ a[0] ๋ฅผ ์“ฐ๋ฉด a[0][0] ๋ฅผ ๊ฐ€๋ฆฌํ‚ค๋Š” ๊ตฌ์กฐ๋ผ๋Š”์˜๋ฏธ์ž„.

  • ๊ฒฐ๊ณผ์ ์œผ๋กœ ์œ„์™€ ๊ฐ™์ด a[0] ๋Š” &a[0][0] ๊ณผ ๋™์ผ์‹œ ํ•˜๊ฒŒ ๋ณด๋ฉด ๋จ.

[ 2์ฐจ์› ๋ฐฐ์—ด ๋ฐ˜๋ณต๋ฌธ ์ถœ๋ ฅ ]

  • ์œ„์™€ ๊ฐ™์ด 2์ฐจ์› ๋ฐฐ์—ด์„ ์ถœ๋ ฅ ํ•  ๋•Œ์—๋Š” 2์ค‘ for ๋ฌธ์„ ํ†ตํ•ด์„œ ์ ‘๊ทผ์„ ํ•  ์ˆ˜ ์žˆ์Œ. ๊ทธ ๋ฐ–์—๋„ ๋‹ค์–‘ํ•จ.

[ ํฌ์ธํ„ฐ์™€ ๋ฐฐ์—ด ํ˜ธํ™˜์  ์‚ฌ์šฉ ]

  • ๋ฐฐ์—ด์˜ ์ธ๋ฑ์Šค๋กœ ์ ‘๊ทผํ•˜๋Š” ๋ฐฉ๋ฒ•๊ณผ ํฌ์ธํ„ฐ๋กœ ์ ‘๊ทผํ•˜๋Š” ๋ฐฉ๋ฒ• ๋‘ ๊ฐ€์ง€๊ฐ€ ์กด์žฌํ•จ. ( ์ธ๋ฑ์Šค ๋ฐฉ์‹๋„ ํฌ์ธํ„ฐ๋กœ ์ทจ๊ธ‰์ด ๋˜๋Š” ๋“ฏ )

[ ์ฃผ์˜ ์‚ฌํ•ญ ]

  • ๋ฐฐ์—ด์˜ ๋ณ€์ˆ˜๋ช…์€ ์ฃผ์†Œ๊ฐ’์ธ๋ฐ, ์ฃผ์†Œ๊ฐ’์— ์ฆ๊ฐ ์—ฐ์‚ฐ์ž๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด ๊ทธ๊ฒƒ์€ ํฌ์ธํ„ฐ ์—ฐ์‚ฐ์ด ๋จ.
  • ๋˜ํ•œ, ํฌ์ธํ„ฐ ๋ณ€์ˆ˜๋กœ๋Š” ์ฆ๊ฐ์—ฐ์‚ฐ์ž๋ฅผ ํ†ตํ•ด ์ฃผ์†Œ๊ฐ’์„ ๋ณ€๊ฒฝ ํ•  ์ˆ˜ ์žˆ์Œ.
  • ๋ฐฐ์—ด์˜ ๋ณ€์ˆ˜๋ช…์ด ์•ˆ๋˜๋Š” ์ด์œ ๋Š”, ๋ฐฐ์—ด๋ช…์€ ํ•ญ์ƒ ๋ฐฐ์—ด์˜ ์ฒซ ๋ฒˆ์งธ ์ฃผ์†Œ๊ฐ’์„ ๊ฐ€์ง€๊ณ  ์žˆ์–ด์•ผ ํ•œ๋‹ค๋Š” ์ด์œ ๋กœ, ๋ฐฐ์—ด๋ช…์—๋Š” ํฌ์ธํ„ฐ ์—ฐ์‚ฐ์ด ๋ถˆ๊ฐ€๋Šฅํ•จ. ์ฆ‰, ๊ฒฐ๊ณผ์ ์œผ๋กœ ๋ฐฐ์—ด๋ช…์€ ์ƒ์ˆ˜๋ผ๋Š” ๊ฒƒ์ž„.
  • ์ฆ‰, ํฌ์ธํ„ฐ๋Š” ๋ณ€์ˆ˜์ง€๋งŒ ๋ฐฐ์—ด๋ช…์€ ๋ณ€์ˆ˜๊ฐ€ ์•„๋‹ˆ๊ณ  ์ปดํŒŒ์ผ๋Ÿฌ๊ฐ€ ์ด๋ฏธ ํŠน์ • ์ฃผ์†Œ์™€ 1:1๋กœ ๋ฌถ์–ด๋‘” ์ƒ์ˆ˜ ์ฃผ์†Œ์ž„.

[ ๋ฐฐ์—ด๊ณผ ํฌ์ธํ„ฐ์˜ ๊ธฐ์–ต๊ณต๊ฐ„ ํ™•๋ณด ]


โœ… 2. ํฌ์ธํ„ฐ ๋ฐฐ์—ด

(1) ํฌ์ธํ„ฐ ๋ฐฐ์—ด์ด๋ž€?

  • ํฌ์ธํ„ฐ ์ž์ฒด๋„ ์ฃผ์†Œ๊ฐ’์„ ์ €์žฅํ•˜๋Š” ๋ณ€์ˆ˜๋กœ์จ ์‚ฌ์šฉ์ด ๊ฐ€๋Šฅํ•˜๊ธฐ์—, ํฌ์ธํ„ฐ ๋ฐฐ์—ด์„ ํ†ตํ•ด ์ฃผ์†Œ๊ฐ’์„ ๋ฐฐ์—ด์— ๋‹ด์„ ์ˆ˜ ์žˆ์Œ.
  • ์œ„์™€ ๊ฐ™์ด char *name1, *name2, *name3; ์™€ ๊ฐ™์ด ๋™์ผํ•œ ์ž๋ฃŒํ˜•์„ ๊ฐ€์ง€๋Š” ํฌ์ธํ„ฐ๊ฐ€ 3๊ฐœ๊ฐ€ ์žˆ๋‹ค๊ณ  ๊ฐ€์ •ํ•˜๋ฉด, ์ด๊ฒƒ์„ char ๋ฌธ์žํ˜• ํฌ์ธํ„ฐ ๋ฐฐ์—ด์— ๋„ฃ์„ ์ˆ˜ ์žˆ์Œ.

(2) ํฌ์ธํ„ฐ ๋ฐฐ์—ด ์‚ฌ์šฉ ์˜ˆ์‹œ

  • ์œ„์™€ ๊ฐ™์ด ํฌ์ธํ„ฐ ๋ฐฐ์—ด ๋ณ€์ˆ˜๋ฅผ ์„ ์–ธํ•ด์„œ ์ดˆ๊ธฐํ™”๋ฅผ ํ•ด์ค„ ์ˆ˜ ์žˆ์Œ. ๋™์  ํ• ๋‹น์ด๋ผ [3] ์—ด์€ 3์—ด์ด๋ฉฐ, ํ–‰์€ ๊ธธ์ด์— ๋”ฐ๋ผ์„œ ์ •ํ•ด์ง.
  • ํŠน์ด์ ์€ 2์ค‘ for ๋ฌธ์—์„œ ์กฐ๊ฑด์‹์œผ๋กœ str[i][j] ๋ฅผ ์‚ฌ์šฉํ•˜๊ณ  ์žˆ๋Š”๋ฐ, ์ด๊ฒŒ ์˜๋ฏธํ•˜๋Š” ๋ฐ”๋Š” ํ•ด๋‹น ๋ฐฐ์—ด์˜ ๊ฐ’์ด ์žˆ๋Š” ๊ฒฝ์šฐ์—๋Š” true ์ด๋ฏ€๋กœ, ๋ฐ˜๋ณต์„ ์ง€์†ํ•˜๊ณ  null ์ธ ๊ฒฝ์šฐ์—๋Š” false ์ด๋ฏ€๋กœ ๋ฐ˜๋ณต์„ ์ข…๋ฃŒํ•˜๊ฒŒ ๋จ.
  • ๋ฌธ์ž์—ด์˜ ๋งˆ์ง€๋ง‰ ์š”์†Œ๋Š” null ์„ ํฌํ•จํ•˜๊ณ  ์žˆ์Œ. ์ด์œ ๋Š”, ๋‹ค์Œ์— ๋‚˜์˜ฌ ๋ฉ”๋ชจ๋ฆฌ ์…€์€ ์—ฐ์†์ ์ด๋ผ ๋ฌธ์ž์—ด์˜ ๋์„ ์•Œ๋ฆฌ๊ธฐ ์œ„ํ•จ์ž„.

โœ… 3. ์ด์ค‘ ํฌ์ธํ„ฐ

(1) ์ด์ค‘ ํฌ์ธํ„ฐ - ๊ฐœ๋…

  • ์ž๋ฃŒ๊ฐ€ ์žˆ๋Š” ๊ณณ์„ ์ด์ค‘์œผ๋กœ ๊ฐ€๋ฆฌํ‚ค๋Š” ํฌ์ธํ„ฐ๋กœ, ์‰ฝ๊ฒŒ๋งํ•ด ํฌ์ธํ„ฐ๊ฐ€ ํฌ์ธํ„ฐ๋ฅผ ๊ฐ€๋ฆฌํ‚ค๋ฉด์„œ ์ตœ์ข…์ ์œผ๋กœ ์ž๋ฃŒ๋ฅผ ์–ป๊ฒŒ ๋จ.
  • ์ด์ค‘ ํฌ์ธํ„ฐ๋Š” ์ผ๋ฐ˜ ํฌ์ธํ„ฐ๋ฅผ ๊ฐ€๋ฆฌํ‚ค๋ฉฐ, ์ผ๋ฐ˜ ํฌ์ธํ„ฐ๋Š” ์‹ค์ œ ์ž๋ฃŒ๋ฅผ ๊ฐ€๋ฆฌํ‚ค๋Š” ๊ตฌ์กฐ์ž„.

(2) ์ด์ค‘ ํฌ์ธํ„ฐ - ์„ ์–ธ๋ฌธ์˜ ํ˜•์‹

  • ** ํฌ์ธํ„ฐ๋ฅผ 2๊ฐœ ์‚ฌ์šฉํ•˜์—ฌ, ์ด์ค‘ ํฌ์ธํ„ฐ ๋ณ€์ˆ˜๋ฅผ ์„ ์–ธ ํ•  ์ˆ˜ ์žˆ์Œ.

(3) ์ด์ค‘ ํฌ์ธํ„ฐ - ์˜ˆ์‹œ

  • ์ด์ค‘ ํฌ์ธํ„ฐ๋Š” ํฌ์ธํ„ฐ๋ฅผ ๊ฐ€๋ฆฌํ‚ค๋Š” ๊ตฌ์กฐ๋กœ ๋งŒ๋“ค์–ด์•ผ ํ•จ.
  • ์ด์ค‘ ํฌ์ธํ„ฐ๊ฐ€ ์ผ๋ฐ˜ ๋ณ€์ˆ˜์˜ ์ฃผ์†Œ๊ฐ’์„ ์ฐธ์กฐ๋Š” ํ•  ์ˆ˜ ์žˆ์ง€๋งŒ, ์ž๋ฃŒํ˜•์ด ๋งž์ง€ ์•Š์•„ ๊ฐ•์ œ๋กœ ํ˜•๋ณ€ํ™˜์„ ์‹œ์ผœ์ค˜์•ผํ•จ.
  • ํ•˜์ง€๋งŒ, ๋„ˆ๋ฌด ์œ„ํ—˜ํ•ด์„œ ์‚ฌ์šฉ์„ ํ•˜์ง€๋Š” ์•Š์Œ. ( int* int** )
  • ์ด๋ ‡๋“ฏ, ๋‹จ์ผ ํฌ์ธํ„ฐ, ์ด์ค‘ ํฌ์ธํ„ฐ ๊ทธ๋ฆฌ๊ณ  ์‚ผ์ค‘, ์‚ฌ์ค‘ ๋“ฑ ๋ฌดํ•œ์œผ๋กœ ์žˆ์Œ.

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[C์–ธ์–ด] ๊ตฌ์กฐ์ฒด์™€ ๊ณต์šฉ์ฒด(2)  (0) 2025.11.29
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