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매개변수

Call by name

int func1()

Call by value

int func1(int a, ...)

Call by address

int func1(int *a, ...)

Call by reference

호출함수
int func1(&a, &b)

피호출함수
int func1(int *aint *b)


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C 표준, GCC 그리고 컴파일 옵션

GCC supports three versions of the C standard, although support for the most recent version is not yet complete. The original ANSI C standard (X3.159-1989) was ratified in 1989 and published in 1990. This standard was ratified as an ISO standard (ISO/IEC 9899:1990) later in 1990. There were no technical differences between these publications, although the sections of the ANSI standard were renumbered and became clauses in the ISO standard. This standard, in both its forms, is commonly known as  C89 , or occasionally as  C90 , from the dates of ratification. The ANSI standard, but not the ISO standard, also came with a Rationale document. To select this standard in GCC, use one of the options  -ansi ,  -std=c90  or  -std=iso9899:1990 ; to obtain all the diagnostics required by the standard, you should also specify  -pedantic  (or  -pedantic-errors  if you want them to be errors rather than warnings). See  Options Controlling C Dialect . Errors in the 1990 ISO C standard were cor

연산자 우선 순위

() (괄호) [] (배열) -> (포인터멤버) . (구조체멤버) ! (부정) ~ (1의보수) ++ (증가) -- (감소) - (부호)  + (부호)  (자료형) (형변환)  * (포인터)  & (주소)  sizeof * (곱셈) / (나눗셈) % (나머지) + (덧셈) - (뺄셈) << >> (비트이동) < <= > >= (관계) == != (관계) & (비트논리곱) ^ (비트배타논리합) | ( 비트논리합 ) && (논리곱) || (논리합) ?: (조건) = (할당) += -= *= /= %= &= ^= |= <<= >>= (복합할당) , (쉼표)

반복문

for 1 for ( 초기값 ; 조건 ; 증감식 ) 2 { 3 명령문 ; 4 } while 1 while ( 조건 ) 2 { 3 명령문 ; 4 } do - while 1 do 2 { 3 명령문 ; 4 } while ( 조건 ); 최소한 한 번은 실행되어야 하는 경우에 사용된다. 무한루프 1 for ( ; ; ) 2 { 3 명령문 ; 4 } 1 while ( 1 ) 2 { 3 명령문 ; 4 } 1 do 2 { 3 명령문 ; 4 } while ( 1 ); C 언어에서, 0이 아닌 값은 모두 참이다. Example : 1 #include <stdio.h> 2 3 /* 4 구구단 5 */ 6 7 int main () 8 { 9 int i , j ; 10 for ( i = 1 ; i <= 9 ; i ++) 11 { 12 for ( j = 1 ; j <= 9 ; j ++) 13 { 14 printf ( "%d x %d = %2d \n " , i , j , i * j ); 15 } 16 printf ( " \n " ); 17 } 18 system ( "PAUSE" ); 19 return 0 ; 20 } 1 #include <stdio.h> 2 3 /* 4 구구단 5 */ 6 7 int main () 8 { 9 int i , j ; 10 i = 1 ; 11 while ( i <= 9 ) 12 { 13