U E D R , A S I H C RSS

Our Major Lang IsCAndCPlus Plus/Variable

๋ณ€์ˆ˜์˜ ์˜์—ญ

์ „์—ญ ๋ณ€์ˆ˜ - ํ•ด๋‹น ํŒŒ์ผ ๋‚ด์—์„œ ์œ ํšจํ•จ (์™ธ๋ถ€ ์ฐธ์กฐ ๊ฐ€๋Šฅ), BSS ์„ธ๊ทธ๋จผํŠธ์˜ ๊ณต๊ฐ„ ์‚ฌ์šฉ
์ง€์—ญ ๋ณ€์ˆ˜ - ํ•ด๋‹น ๋ธ”๋Ÿญ ๋‚ด์—์„œ ์œ ํšจํ•จ
static ์ „์—ญ ๋ณ€์ˆ˜ - ํ•ด๋‹น ํŒŒ์ผ ๋‚ด์—์„œ ์œ ํšจํ•จ (์™ธ๋ถ€ ์ฐธ์กฐ ๋ถˆ๊ฐ€๋Šฅ)

๋ณ€์ˆ˜์˜ ๊ธฐ์–ต ๋ถ€๋ฅ˜ ์ง€์ •

๋ณ€์ˆ˜์˜ ๊ธฐ์–ต ์žฅ์†Œ ์„ ํƒ

register - CPU ๋ ˆ์ง€์Šคํ„ฐ๋ฅผ ๋ณ€์ˆ˜๋กœ ํ• ๋‹น
auto - ์Šคํƒ ๊ณต๊ฐ„์„ ๋ณ€์ˆ˜๋กœ ํ• ๋‹น
static - BSS ์„ธ๊ทธ๋จผํŠธ์˜ ๊ณต๊ฐ„์„ ๋ณ€์ˆ˜๋กœ ํ• ๋‹น
extern - ์™ธ๋ถ€ ๋ณ€์ˆ˜ ์ฐธ์กฐ

const ํ‚ค์›Œ๋“œ

~cpp
const int a;
int const b;
const int *c;
int * const d;
const int * const e;

volatile ํ‚ค์›Œ๋“œ

~cpp
#include <stdio.h>
#include <time.h>

void main()
{
	clock_t start, finish;
	double duration;

	start = clock();

	volatile int a = 10, b = 20, c;
	for(int i = 0 ; i < 1000000000 ; i++)
		c = a * b;

	finish = clock();

	duration = (double)(finish - start) / CLOCKS_PER_SEC;
	printf("%2.1f seconds\n", duration);
}
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