HansJack

#include <stdio.h>
int main()
{
	printf("Hello World!\n");

	return 0;
}

#include <stdio.h>
int main()
{	//聲明 declaration
	int number = 123;
	//定義 definition
	printf("%d\n, number");
	//賦值 assignment
	return 0;
}	//Frank_PPT講師在這一節還講到了TAB鍵與制表符的使用

identifier:
	nondigit
 	identifier
	digit

nondigit:
 	_ a b c d e f g h i j k l m n o p q r s t u v w x y z
 	A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

digit:
 	0 1 2 3 4 5 6 7 8 9

add
ADD
Add
aDD

j
count
temp1
top_of_page
skip12
LastNum

//行
    注釋

/*
        块
	注
	释
*/

//int 變量
#include <stdio.h>

int main(){
	//integer 賦值
	int sun_flower = 9673;

	printf("陽光目前的數值：%d\n", sun_flower);

	return 0;
}

#include <stdio.h>
int main()
{
	int number = 100;
	//以十進制表示
	printf("Decimal: %d\n", number);

	printf("Octal: %o\n", number);

	printf("Hexadeciaml (lowercase) : %x\n", number);

	printf("Hexadeciaml (uppercase) : %X\n", number);

	return 0;
}

#include <stdio.h>

int main() {

	float temperture = 36.5f;

	float humidity = 48.3f;

	float speed_of_sound = 343.5e2f;

	float lenght = 12.3f, width = 23.45f, height = 34.56f;

	printf("Temperture: %f\n", temperture);
	printf("Humidity: %f\n", humidity);
	printf("Speed_of_Sound: %f\n", speed_of_sound);
	printf("Lenght: %f x %f x %f\n", lenght width height);
//丟失精度
//double %lf , float %f
	return 0;
}

#include <stdio.h>

int main () {

float num = 123.456;

printf("Using %%f: %f\n", num);

//%e %E 科學計數法格式化輸出
ptintf("Using %%e: %e\n", num);
printf("Using %%E: %E\n", num);

//%a %A 十六進制浮點數 p計數法
printf("Using %%a: %a\n", num);
printf("Using %%A: %A\n", num);

return 0;
}

#include <stdio.h>
#include <float.h>//點開看看

int main() {

	float max_float = FLT_MAX;

	float overflow = max_float * 1000.0f;
	//OverFlow 上溢

	float min_float = FLT_MIN;

	float underfloat = min_float / 1000.0f;
	//UnderFlow 下溢

	printf("Maximum Float: %e\n", max_float);
	printf("OverFloat: %e\n", overflow);
	printf("Minimum Float: %e\n", min_float);
	printf("UnderFloat: %e\n", underfloat);

	return 0;
}

#include <stdio.h>
#include <float.h>
#include <math.h>

int main() {

	//正無窮大
	float positive_infinty = INIFITY;
	printf("Positive Infinity: %f\n", positive_infinty);

	//負無窮大
	float negative_infinty = -INIFITY;
	printf("Negative Infinity: %f\n", negative_infinty);

	//除以0產生的無窮大
	float num = 1.0f;
	float inifity = num / 0.0f;
	printf("0.0 / 0.0 = %f\n", nan);

	//Nano 0/0
	//float nan = 0.0f /0.0f;
	//printf("0.0f / 0.0f =%f\n", nan)

	//對負數開平方根
	float negative_sqrt = sqrt(-1.0f);
	printf("sqrt(1.0f) = %f\n", nefative_sqrt);

	return 0;
}

#include <stdio.h>

int main() {

	//四舍五入
	//IEEE 754
	//最近偶數舍入  round to nearest, ties to even
	//銀行家舍入

	//3.14159
	float number = 3.14159f;
	printf("%.4f\n", number);

	//3.15
	//3.25
	return 0;
}

#include <stdio.h>

int main() {

	//double

	//float 丟失精度

	//3D渲染

	//利息 NASA

	//浮點常量 3.14
	//3.14 默認double類型 特別注明3.14f

	return 0；

}

#include <stdio.h>

int main() {
 
	float float_num 1.0 / 3.0;
	double double_num = 1.0 / 3.0;

	printf("Float precision: %20f\n", float_num);
	printf("Double precision: %.20lf\n", double_num);
	//float 和 double 有效精度的對比
	printf("Defined max precision for double: %d\n", FLT_DIG)
	printf("Defined max precision for float: %d\n", DBL_DIG)

	//53除以log₂10  24除以log₂10  即為精確度

}

#include <stdio.h>

int main() {

	char mych = 'a'; //實際用int類型 存儲， 將A轉化成int類型 int(97)

	printf("mych: %c\n")；

	//ASCII美國信息標準代碼 一般使用7bit 包括128個字符


}

清除屏幕 print("\033[2J");
移动光标 print("\033[%d;%dH", 3, 3);

#include <stdio.h>
#include <stdbool.h>

int main() {
	//true or false
	//轉換成 1 or 0

	bool is_game_win = true;
	bool is_game_over = false;

	return 0;
}

#include <stdio.h>
#define PI 3.14

int main() {
	//常量

	const double MAX_USER = 100;

	printf("PI: %lf\n", PI);

	return 0;

}

#include <stdio.h>
#include <stdint.h>
#include <inttype.h>
int main() {

	//數據對象
	//左值 Lvalue
	//右值 Rvalue
	//運算符
	uint32_t apple_box = 5;

	uint32_t orange_box = 5;

	printf("蘋果盒子裡面有 %" PRIu32 "個蘋果\n", apple_box);
	printf("橘子盒子裡面有 %" PRIu32 "個橘子\n", orange_box);

	uint32_t total_fruit = apple_box + orange_box;

	printf("盒子裡面有 %" PRIu32 "個水果\n", total_box);
 
	return 0;

}

#include <stdio.h>
#include <stdint.h>
#include <inttype.h>
int main() {

	int32_t value = 5;
	int32_t result_1;
	int32_t result_2;

	//後綴遞增，先賦值，再++
	result_1 = value++;
	//前綴遞減，先--，後賦值
	result_2 = --value;
	printf("After postfix increment, result_1 = %" PRIu32 ",result_2 = %" PRIu32 ", value = %" PRIu32 "\n", result_1, result_2, value);

	return 0;

}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>

int main() {

	uint8_t num = 22;
	num >> 2;//高位補零，低位排擠

	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>

int main() {

	uint8_t num = 22;
	//num >> 2; 高位補零，低位排擠

	uint8_t num = 22;
	printf("Original number: %" PRIu8 " (binary: 00010110)\n", num);

	uint8_t left_shifted = num << 2;
	printf("Left shifted by 2: %" PRIu8 " (binary: 01011000)\n", num);

	uint8_t right_shifted = num >> 2;
	printf("Right shifted by 2: %" PRIu8 " (binary: 00000101)\n", num);

	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>

int main() {

	uint8_t num = 25;

	//uint32_t result = num * 1024;
	printf("Result: %" PRIu32 "\n", result);
	ALU 负责 基本的運算

	return 0;
}

include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>

int main() {

	int a = 10;
	int b = 20;
	//xxx ? xxx : xxx 判斷true or false
	bool greater = a > b;
	printf("a > b: %d\n", greater);
	printf("a > b: %s\n", greater ? "true" , "false");

	bool less = a < b;
	printf("a < b: %d\n", less);
	printf("a < b: %s\n", less ? "true" , "false");

	bool not_equal = a != b;
	printf("a != b: %d\n", not_equal);
	printf("a != b: %s\n", not_equal ? "true" , "false");

	bool equal = a == b;
	printf("a == b: %d\n", equal);
	printf("a == b: %s\n", equal ? "true" , "false");

	bool greater_or_equal = a >= b;
	printf("a >= b: %d\n", greater_or_equal);
	printf("a >= b: %s\n", greater_or_equal ? "true" , "false");

	bool less_or_equal = a <= b;
	printf("a <= b: %d\n", less_or_equal );
	printf("a <= b: %s\n", less_or_equal ? "true" , "false");

	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>

int main() {

	int score = 89;

	printf("你的成績等級：%s\n", score >= 60 ? "及格" : "不及格");

	return 0;
}

#include 
int main() { 
	int score = 85; 
	// 你可以根據需要修改這個分數 
	const char* result = (score >= 90) ? "優秀" : (score >= 85) ? "一般" : (score >= 60) ? "合格" : "不及格"; printf("%s\n", result); 

	return 0; 
}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>

int main() {

	int a = 12;
	int b = 25;

	// & 二進制 位位比較 都是1才輸出1 比如
	printf("%d\n", 12 & 25);
	//將特定位清零、檢查某一位是否為1

	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>

int main() {

	int a = 2;
	int b = 5;

	// | 二進制 位位比較 有1就輸出1 比如0111 
	printf("%d\n", a | b);
	//設置特定位、組合標誌位

	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>

int main() {

	int a = 2;
	int b = 10;

	// ^ 二進制 位位比較 有1 0才輸出1 比如1000 
	printf("%d\n", a ^ b);
	//邏輯異或 XOR操作
	//翻轉特定位、交換兩個變量值、檢查不同

	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>

void print_binary(uint8_t num);

int main() {

	uint8_t status = 0b00001100;	//初始狀態

	printf("Initial status: 0b");
	print_binary(status);
	printf("\t(Binary)\n");

	status = status & 0b11111011;	//mask掩碼 異或 控制
	printf(("Fanal status: 0b");
	printf("\t(Binary)\n");
	return 0;
}

void print_binary(uint8_t num);
	for (int index = 7; index >= 0; index--) {
	    printf("%d", (num >> index) & 1);
	}
}

#include <stdio.h>
/*
struct BigStruct {
	//..
	//..
};

void uodate(BigStruct& bs) {
	BigStruct temp = someExp();

	bs = bs + temp;

	bs += temp;

}
*/


int main() {

	int base_number = 8;
	int add_number = 2;
	int sub_number = 3;
	int mul_number = 2;
	int div_number = 5;
	int mod_number = 4;

	base_number += add_number;
	//In-place Modification 原地修改

	base_number -=
	base_number *=
	base_number /=
	base_number %=
	base_number <<=
	base_number >>=
	base_number &=
	base_number |=
	base_number ^=

	return 0;

}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>

int main() {

	uint32_t a = 1, b = 2, c = 4;

	uint32_t result = (a += 1, b -= 1, c += 3);

	printf("a = %d, b = %d, c = %d, result = %d", a, b, c, result);

	return 0;

}

// cpp_comma_operator.cpp
#include <stdio.h>
int main () {
   int i = 10, b = 20, c= 30;
   i = b, c;
   printf("%i\n", i);

   i = (b, c);
   printf("%i\n", i);
}

20
30

func_one( x, y + 2, z );
func_two( (x--, y + 2), z );

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>

int main() {

	int32_t result;

	result = a * b + c << d >e ? b : c * sizeof(++e) / sizeof(int32_t);

	printf(Result: %" PRId32 ", result);

	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <inttype.h>
#include <stdbool.h>

int main() {

	uint32_t number = 100;

	//if 語句
	if (number > 10) {
		printf("這個數大於10！\n");
		printf("這個數大於10！\n");

	}

	if (number >=100) {
		printf("這個數大於等於100！\n");


	} 
	else {
		printf("這個數小於100！\n");

	}


	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <inttype.h>
#include <stdbool.h>

int main() {

	bool is_weather_sunny = false;
	bool is_venue_available = true;

	if (is_weather_sunny && is_venue_available) {
		printf("活動如期舉行!\n");
		}
	else {
		printf("活動不能如期舉行!\n")；
	if (!is_weather_sunny) {
		printf("原因：天氣不晴朗！\n")
		}
	if (!is_vueue_available) {
		printf("原因：沒有場地!\n")
		}

	return 0;
}

//自動販賣機
//只支持硬幣
#include <stdio.h>
#include <stdbool.h>
#include <inttypes.h>

int main(void)

{

	const uint32_t PRICE = 3;	//drink's price

	uint32_t balance = 0;		//now total_coin

	uint32_t coin;				//every coin in it

	puts("drink's price is $5 please!");

	while (balance < PRICE)	//在投夠數額前
	{
		puts("don't!");	//拒絕交易

		scanf_s("%" PRIu32, &coin);


		if (coin == 1 || coin == 2 || coin == 5) //確定金額類型
		{
		balance += coin;	//賦值 加等

		printf("你已經投入 $%" PRIu32 "\n", balance);
		}
		else {

		printf("sorry!我們不接受 $%" PRIu32 "的硬幣\n", coin);
		}
	}

	if (balance > PRICE) {
		printf("找零：%" PRIu32 "\n", balance - PRICE);
	}
	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <inttypes.h>

int main(void)
{

		//玩家進入不同條件的房間

	uint32_t coins= 15;
	bool is_vip = true;
	bool have_special_tool = false;

	if (is_vip) {
		puts("vip Enter!\n");
	}
	else {
		puts("not_vip Exit!\n");
	}

	if (coins >= 10 || have_special_tool) {
		puts("Enter!\n")
	}
	else {
		puts("Exit!\n");
	}
	return 0;
}

#include <stdio.h>
#include <stdbool.h>
#include <inttypes.h>

int main(void)
{
	const uint32_t all_laps = 100;

	uint32_t current_laps = 0;

	puts("開始!");

	while (current_laps < all_laps)
	{
		current_laps++;

		printf("完成第 %"PRIu32"圈。\n", current_laps);
	}
	return 0;
}

//自動販賣機
//只支持硬幣
#include <stdio.h>
#include <stdbool.h>
#include <inttypes.h>

int main(void)

{

	const uint32_t price = 10;	//drink's price

	uint32_t balance = 0;		//now total_coin

	uint32_t coin;				//every coin in it

	puts("drink's price is $5 please!");

	while (balance < price)	//在投夠數額前 只有在夠的時候才開始循環
	{
		puts("don't!");	//拒絕交易

		//模擬投幣
		scanf_s("%" priu32, &coin);


		if (coin == 1 || coin == 2 || coin == 5) //確定金額類型
		{ 
		balance += coin;	//賦值 加等 計數

		printf("你已經投入 $%" priu32 "\n", balance);
		}
		else {

		printf("sorry!我們不接受 $%" priu32 "的硬幣\n", coin);
		}
	}

	if (balance > price) {
		printf("找零：%" priu32 "\n", balance - price);
	}
	return 0;
}

//一定要寫printf 可以看到效果。

//遇到循環問題
//不要在循環中多次運用，來避免不必要的錯誤

//寫一個計算機求和


#include <stdio.h>
#include <inttypes.h>

int main(void)
{
	uint32_t sum = 0;	//設置初始數字和為0

	uint32_t number = 1;	//第一次number的值

	while (number != 0)	//設置0為退出循環的方法
	{
		scanf_s("%" PRIu32, &number);	//scanf重新賦值number，第一次number值實際沒有用到。
		sum += number;
	}

	printf("所求的和sum是 %" PRIu32 "\n", sum);

	return 0;
}

#include <stdio.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdlib.h>
#include <limits.h>
#include <errno.h>

int main()
{
	uint32_t sum = 0;	//設置初始數字和為0

	char input[50];	//我們將用戶輸入的字符轉換成數字

	char* end;

	puts("請輸入一系列數字，用回車隔開，我們計算他們的和,輸出q結束");

	while (true)	//設置0為退出循環的方法
	{
		errno = 0;

		puts("輸入一個數字：");

		scanf_s(" %49s", &input, 50);

		if (input[0] == 'q' && input[1] == '\0') {
			break;
		}

		long number = strtol(input, &end, 10);
		//將輸入的字符轉換成數字，並且加到總和sum中
		//0的ASCII為48
		if (end == input || *end !='\0') {
			printf("無效輸入，請輸入一個數字或是字符q\n");

		}
		else if (errno == ERANGE || number < 0 || number > UINT32_MAX){
			printf("數字超出範圍！請輸入小於或等於 %u 的正整數\n", UINT32_MAX);
		}
		else {
			sum += (uint32_t)number;
		}

	}

	printf("所求的和sum是 %" PRIu32 "\n", sum);

	return 0;
}

#include <stdio.h>
#include <inttypes.h>
#include <stdbool.h>

int main()
{
	uint32_t sum = 0;	//設置初始數字和為0

	uint32_t number;	//第一次number的值

	puts("請輸入一系列數字，用回車隔開，我們計算他們的和,輸出0結束");

	while (true)	//設置0為退出循環的方法
	{

		scanf_s(" % " PRIu32, &number);

		if (number == 0) {
			break;
		}

		sum += number;
	}

	printf("所求的和sum是 %" PRIu32 "\n", sum);

	return 0;
}

//衛語句的使用：租車案例
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <inttypes.h>

void check_car_rent(uint8_t age, uint8_t driving_exp_years);

int main(void) 
{
	check_car_rent(22, 3);

	return 0;
}

void check_car_rent(uint8_t age, uint8_t driving_exp_years) {
//衛語句
	if (age < 21) {
		puts("不符合條件，年齡不足！");
		return 0;
	}

	if (driving_exp_years < 1) {
		puts("不符合條件，駕駛年齡不足!");
		return 0;
	}
}

//簡化邏輯表達式
#include <stdbool.h>
#include <inttypes.h>

int main(void) 
{
	//邏輯表達式應該簡化！
	bool is_weekend = true;
	bool has_enter = true;

	if (!has_enter) {
		return 0;
	}

	return 0;
}

#include <stdbool.h>
#include <inttypes.h>

int main(void)
{
	//狀態機：管理複雜狀態的轉換，使用switch case

	uint8_t traffic_state = 0;

	switch (traffic_state)
	{
	case 0:
		puts("red");
		traffic_state = 1;
		break;
	case 1:
		puts("yellow");
		traffic_state = 2;
		break;
	case 2:
		puts("green");
		traffic_state = 0;
		break;
	default:
		puts("???");
		break;
	}

	return 0;
}

//switch-case 與 if-else 的區別
#include <stdio.h>
#include <stdbool.h>
#include <inttypes.h>

int mian(void)
{


	return 0;
}

//循環在生活中的作用


#include <stdio.h>
#include <stdbool.h>
#include <inttypes.h>

int main(void)
{
	int32_t number;

	scanf_s("請輸入: %d %d %d", &number, &number, &number);//在實際開發中不用scanf
	//not write \n in it
	printf("已經掃描到你輸入的數字為: %d %d %d\n", number, number, number);

	return 0;
}

//do-while 和 while 的區別

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>

int main(void)
{
	uint32_t total_laps = 10;

	uint32_t current_laps = 0;

	puts("罰跑開始！");

	do {

		current_laps++;
		printf("跑步者完成第%" PRIu32 "圈\n", current_laps);
	} while (current_laps < total_laps);

	return 0;
}

//do-while 的實際作用

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>

int main(void)
{

	uint32_t choice;

	do 
	{

		puts("****主菜單****");
		puts("1. 新遊戲");
		puts("2. 載入遊戲");
		puts("3. 退出");
		scanf_s("%" PRIu32, &choice);

		switch (choice) 
		{
		case 1:
			puts("****創建新遊戲！");
			break;
		case 2:
			puts("****載入存檔！");
			break;
		case 3:
			puts("****退出遊戲！");
			break;
		}

	} while (choice != 3);

	return 0;

}

//隨機數猜數遊戲案例
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <time.h>
#include <stdlib.h>

int main(void)
{
	uint32_t secret_num, guess, status;
	char buffer[50];

	srand(time(NULL));
	//生成1-100的隨機數
	secret_num = rand() % 100 + 1;

	puts("猜猜嘛！");

	do {
		puts("請輸入你猜的數：");

		fgets(buffer, sizeof(buffer), stdin);
		status = sscanf_s(buffer, "%d", &guess);
		//衛語句
		if (status != 1) {
				puts("輸入無效！");
				continue;
		}

		if (guess < secret_num) {
			puts("太小了！");
		}
		else if (guess > secret_num) {
			puts("太大了！");
		}

	} while (guess != secret_num);

	printf("恭喜你，猜對了！");

	return 0;
}

//continue語句
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>

int main(void) {

	uint32_t sum = 0;
	int32_t number;

	puts("請輸入一系列的正整數,可以輸入負數,輸入0結束");

	while (1) {
		puts("請輸入一個數字");

		scanf_s("%d", &number);

		if (number == 0) {
			break;
		}
		if (number < 0) {
			continue;	//continue 直接跳過這次循環
		}
		sum += number;//計數
	}
	printf("計算結果為：%" PRIu32 "\n", sum);

	return 0;

}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
int main() {
    uint32_t number;
    
    puts("請輸入數字（0-100），輸入-1後結束程序");
    
    while (1) {
        puts("請輸入一個數字：");
        scanf_s("%d", &number);
        //衛語句！檢查條件結束
        if (number == -1) {
            break;
        }
        if (number < 0 || number > 100) {
            continue;//跳過本次循環的剩余部分。
        }
        sum += number;
    }
    
    return 0;
}

//初探for循環
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>

int main(void)
{
	//for循環
	const uint32_t total_laps = 10;	//目標圈數

	//uint32_t current_lap = 0;	初始化當前圈數

	puts("跑步者開始跑步");

	for (uint32_t current_lap = 0;current_lap <= total_laps;current_lap++) {
		printf("跑步者完成第 %" PRIu32 " 圈\n", current_lap);
	}

	return 0;

}

//整數平方求和
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>

int main(void)
{
	 /*
		目的為了計算從1到n（n由玩家輸入）的所有整數的平方和

	 */
	uint32_t number;

	uint32_t sum_of_squares = 0;

	puts("輸入整數n");

	scanf_s("%u", &number);

	for (uint32_t index = 1; index <= number; index++) {
		sum_of_squares += index * index;
	}

	printf("%" PRIu32 "\n", sum_of_squares);
	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>

int main(void) {

	/*
		星光大道
		倒數五個數
	*/

	uint32_t start_number;
	
	puts("請輸入一個正整數");
	scanf_s("%" SCNu32, &start_number);

	puts("倒數開始");
	for (uint32_t index_number = start_number; index_number > 0; index_number--)
	{
		printf("%" SCNu32 "\n", index_number);
	}
	puts("倒數停止");
	return 0;
}

//擴展sleep
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <windows.h>

int main(void) 
{

	/*
		星光大道
		倒數五個數
	*/

	uint32_t start_number;
	
	puts("請輸入一個正整數");
	scanf_s("%" SCNu32, &start_number);

	puts("倒數開始");
	for (uint32_t index_number = start_number; index_number > 0; index_number--)
	{
		printf("%" SCNu32 "\n", index_number);
      Sleep(1000);
	}
	puts("倒數停止");
	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <windows.h>
//階乘

int main(void) {

	uint32_t number;
	uint32_t factorial = 1;

	puts("請輸入一個正整數 :");
	scanf_s("%" SCNu32, &number);

	for (uint32_t index = 1; index <= number; index++) {
		factorial *= index;
	}

	printf("%" PRIu32 "! = %" PRIu32 "\n", number, factorial);

	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <math.h>
#include <stdbool.h>

int main(void)
{
	double number = 4.00;

	printf("%lf\n", sqrt(121));

	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <math.h>
#include <stdbool.h>

int main(void)
{
	uint32_t num;

	bool is_prime = true;

	puts("請輸入一個正整數，除了1，我們將檢查它是否為素數：");

	scanf_s("%" SCNu32, &num);

	if (num <= 1) {
		is_prime = false;
	}
	else {
		//for , 檢查除了1和它本身之外的因數
		for (uint32_t i = 2; i * i <= num; i++) {
			if (num % i == 0) {
				is_prime = 0;
				break;
			}
		}
	}
	return 0;
}

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <math.h>
#include <stdbool.h>

int main(void)
{
	uint32_t size;
	puts("請輸入圖案的大小: ");
	scanf_s("%" SCNu32, &size);

	//特點：長和寬一樣
	puts("打印正方形圖案");

	for (uint32_t i = 0; i < size; i++) {
		for (uint32_t j = 0; j < size; j++)
		{
			printf("* ");
		}
		printf("\n");
	}
	return 0;
}