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lab2/Calendar.c

+#include <stdio.h> 
+
+int main () {
+	
+	int dd, mm, yy;
+	
+	printf("Please enter the date dd/mm/yy:\n");
+	scanf("%d/%d/%d", &dd, &mm, &yy);
+
+	int bissextile = yy % 400 == 0 || (yy % 4 == 0 && yy % 100 != 0);
+	
+	
+	if (dd>31 || dd<1 || mm>12 || mm<1)
+		printf("Invalid date.\n");
+  
+        if((mm==2 && dd<30 && bissextile) || (mm==2 && dd<29 && bissextile==0))
+            printf("valid date.\n");
+        else
+			if((mm==4 || mm==6 || mm==9 || mm==11)&& dd<31)
+				printf("valid date.\n");
+			else
+				if(dd<31 && mm!=2)
+					printf("valid date.\n");
+                 else
+                    printf("Invalid date.\n");
+		
+	return 0;
+}