#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <windows.h>
#include <stdlib.h>
int main()
{
int arr[] = { 1,2,3,4,5,6,7,8,9,10 };
int k = 7;
//寫一個代碼，在arr陣列（有序的）中找到7
int i = 0;
int sz = sizeof(arr) / sizeof(arr[0]);
for (i = 1; i <= sz; i++)
{
if (arr[i] == 7)
{
printf("%d\n", i);
break;
}
else
{
printf("無");
break;
}
}
//折半查找演算法，二分查找演算法
int left = 0; //左下標
int right = sz - 1; //右下標
while(left<=right)
{
int mid = (left + right) / 2;
if (arr[mid] > k)
{
right = mid - 1;
}
else if (arr[mid] < k)
{
left = mid + 1;
}
else
{
printf("%d\n", mid);
break;
}
if (left > right)
{
printf("找不到了");
}
}
//動態顯示文字
char arr1[] = "welcome to bit!!!";
char arr2[] = "#################";
int sz = sizeof(arr1) / sizeof(arr1[0]);
int i = 0;
int left = 0;
int right = sz - 2; //或者=strlen(arr)-1
for (i = 0; i < sz/2; i++)
{
arr2[left] = arr1[left];
arr2[right] = arr1[right];
printf("%s\n", arr2);
Sleep(1000); //休息一秒，函式單位ms，頭檔案windows.h
system("cls"); //執行系統命令的函式 - cls - 清空螢屏
left++;
right--;
}
//用戶輸入密碼，只能輸入三次
int i = 0;
char password[20] = { 0 };
for (i = 0; i < 3; i++)
{
printf("請輸入密碼:>");
scanf("%s", password);
if (strcmp(password,"123456") == 0) //==不能用來判斷兩個字串相等，應該使用一個庫函式 - strcmp
{
printf("登錄成功\n");
break;
}
else
{
printf("密碼錯誤！\n");
}
}
if (i == 3)
printf("三次密碼均錯誤，退出程式\n");
return 0;
}
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