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#include <stdio.h>
 
int isValid(int dd, int mm, int yy);
 
int main()
{
	printf("Enter a date in dd/mm/yyyy format: ");
	int dd, mm, yy;
	scanf("%d/%d/%d", &dd, &mm, &yy);
	if (isValid(dd, mm, yy))
		printf("The date is valid.\n");
	else
		printf("The date is invalid.\n");
 
	return 0;
}
 
int isValid(int dd, int mm, int yy)
{
	//int leapYear;
	if (yy <= 0 || mm <= 0 || mm > 12 || dd <= 0)
		return 0;
	switch(mm)
	{
		case 1: case 3: case 5: case 7: case 8: case 10: case 12:
			int k = 5;
			return dd <= 31;
		case 4: case 6: case 9: case 11:
			return dd <= 30;
		default:
			printf("Here");
			int  a = 1;
			printf("%d", a);
//			int leapYear = yy % 400 == 0 || (yy % 4 == 0 && yy % 100 != 0);
//			return dd <= 28 || (leapYear && dd <= 29);
	}
	return 1; //Control never reaches here
}
 

prog.c: In function ‘isValid’:
prog.c:26:4: error: a label can only be part of a statement and a declaration is not a statement
    int k = 5;
    ^~~
prog.c:26:8: warning: unused variable ‘k’ [-Wunused-variable]
    int k = 5;
        ^
prog.c: In function ‘main’:
prog.c:9:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d/%d/%d", &dd, &mm, &yy);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Standard output is empty