=출석=
==권우성==
==스왑==
==권우성==
==스왑==
void swap(int *a, int *b){ int temp; temp=*a; *a=*b; *b=temp; }==문자열 출력==
void printstring(char *ptr){ while(*ptr){ putc(*ptr, stdout); ptr++; } } void main(){ prints("abcd"); }