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#include <stdio.h>
 
int main()
{
	const int FREEZING = 0;
	float temperature;
	int cold_days = 0;
	int all_days = 0;
 
	printf("최저 기온들의 목록을 입력하시오.\n");
	printf("섭씨 단위를 사용하시오.(입력을 끝내려면 q)\n");
 
	while(scanf("%f,&temperature) == 1)
		{
			all_day++;
			if(temperature < FREEZING)
				cold_days++;
			}
 
	if(all_days !=0)
			printf("전체 %d일 중에 영하의 날씨는 %.1f%%였습니다.\n",
					all_days, 100.0 * (float) cold_days / all_days);
	if(all_days == 0)
			printf("입력 데이터가 없습니다.\n");
 
 
 
	return 0;
 
}

prog.c: In function ‘main’:
prog.c:13:14: warning: missing terminating " character
  while(scanf("%f,&temperature) == 1)
              ^
prog.c:13:14: error: missing terminating " character
  while(scanf("%f,&temperature) == 1)
              ^~~~~~~~~~~~~~~~~~~~~~~
prog.c:14:3: error: expected expression before ‘{’ token
   {
   ^
prog.c:30:1: error: expected ‘)’ before ‘}’ token
 }
 ^
prog.c:30:1: error: expected expression before ‘}’ token
prog.c:8:6: warning: unused variable ‘all_days’ [-Wunused-variable]
  int all_days = 0;
      ^~~~~~~~
prog.c:7:6: warning: unused variable ‘cold_days’ [-Wunused-variable]
  int cold_days = 0;
      ^~~~~~~~~
prog.c:6:8: warning: unused variable ‘temperature’ [-Wunused-variable]
  float temperature;
        ^~~~~~~~~~~
prog.c:5:12: warning: unused variable ‘FREEZING’ [-Wunused-variable]
  const int FREEZING = 0;
            ^~~~~~~~

Standard output is empty