diff --git a/C Crash Course/16 Sturcture&Union&Enum/stucture/prelesson/stucture-as-func-parameter/main.c b/C Crash Course/16 Sturcture&Union&Enum/stucture/prelesson/stucture-as-func-parameter/main.c
new file mode 100644
index 0000000..037a5bf
--- /dev/null
+++ b/C Crash Course/16 Sturcture&Union&Enum/stucture/prelesson/stucture-as-func-parameter/main.c	
@@ -0,0 +1,99 @@
+#include<stdbool.h>
+
+struct date {
+	int month;
+	int day;
+	int year;
+	//月 - 日 - 年 咱得国际化！
+};
+
+bool isleap(struct date d);//判断是否为闰年
+int NumberOfDays(struct date d);//判断天数
+bool ErrorInputCheck(struct date d);//检查是否是合法输入
+
+int main(void) {
+	
+	struct date today, tomorrow;
+	int flag = 0;
+
+	printf("Input today's date:(format: month day year)\n");
+	scanf("%d %d %d", &today.month, &today.day, &today.year);
+
+	if (ErrorInputCheck(today))
+		return 0;
+
+	if (today.day != NumberOfDays(today)) {
+
+		tomorrow = today;
+		tomorrow.day++;
+
+	}
+	else if (today.month != 12) {
+
+		tomorrow.day = 1;
+		tomorrow.month = today.month + 1;
+		tomorrow.year = today.year;
+
+	}
+	else {
+
+		tomorrow.day = 1;
+		tomorrow.month = 1;
+		tomorrow.year = today.year + 1;
+
+	}
+
+	printf("%d - %d - %d\n", tomorrow.month, tomorrow.day, tomorrow.year);
+
+	return 0;
+}
+
+bool ErrorInputCheck(struct date d) {
+	
+	bool flag = false;
+
+	if (d.day <= 0 || d.day > 31) {
+
+		printf("illegal input of day!\n");
+		flag = true;
+
+	}
+	if (d.month <= 0 || d.month > 12) {
+
+		printf("illegal input of month!\n");
+		flag = true;
+
+	}
+	if (d.year < 0) {
+
+		printf("illegal year!\n");
+		flag = true;
+
+	}
+
+	return flag;
+}
+
+int NumberOfDays(struct date d) {
+
+	int day = 0;
+	int days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+
+	if (d.month == 2 && isleap)
+		day = 29;
+	else
+		day = days[d.month - 1];
+
+	return day;
+}
+
+bool isleap(struct date d) {
+
+	bool leap = false;
+	int year = d.year;
+
+	if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
+		leap = true;
+
+	return leap;
+}
\ No newline at end of file
diff --git a/C Crash Course/16 Sturcture&Union&Enum/stucture/prelesson/stucture-as-func-parameter/readme.md b/C Crash Course/16 Sturcture&Union&Enum/stucture/prelesson/stucture-as-func-parameter/readme.md
new file mode 100644
index 0000000..7be54c2
--- /dev/null
+++ b/C Crash Course/16 Sturcture&Union&Enum/stucture/prelesson/stucture-as-func-parameter/readme.md	
@@ -0,0 +1,18 @@
+#### 缁撴瀯浣撲綔涓哄嚱鏁板弬鏁�
+**鏄庡ぉ鐨勬棩鏈�**
+*鍐欎竴涓▼搴�:杈撳叆浠婂ぉ鐨勬棩鏈�,姹傛槑澶╃殑鏃ユ湡*
+
+鐪嬬潃杩欎釜闂绠�鍗�,瀹為檯涓婄◢寰湁鐐规妧宸�.
+缁欏嚭涓嬮潰鍥涗釜鐗规畩鏃ユ湡,澶у鍙互鎬濊�冧竴涓�:
+
+>2020 - 1 -31
+>2020 - 11 - 31
+>2020 - 12 - 31
+>2000 - 2 - 28
+
+#### Use sturcture itself as a function's parameter
+it's not an efficient way
+
+>K & R said 锛坧.131 锛�
+>"if a large structure is to be passed to a function,
+>in is generally more efficent to pass a pointer than to copy the whole structure"
\ No newline at end of file