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#include <stdio.h>
 
int main(void) {
	// your code goes here
 
	int year = 0;
	int yun;
 
	printf("윤년 구하기\n년도를 입력해 주세요.(4자리 숫자만 입력): ");
	scanf_s("%d", &year);
 
	bool rst = ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
 
	const char* tr = "%d년은 윤년입니다!";
	const char* fa = "%d년은 평년입니다!";
 
	printf(rst ? tr : fa, year);
	return 0;
}
 

prog.c: In function ‘main’:
prog.c:10:2: warning: implicit declaration of function ‘scanf_s’; did you mean ‘scanf’? [-Wimplicit-function-declaration]
  scanf_s("%d", &year);
  ^~~~~~~
  scanf
prog.c:12:2: error: unknown type name ‘bool’; did you mean ‘_Bool’?
  bool rst = ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
  ^~~~
  _Bool
prog.c:7:6: warning: unused variable ‘yun’ [-Wunused-variable]
  int yun;
      ^~~

Standard output is empty