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#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<string.h>
//
//int main()
//{
//?? ?int ch = 0;
//?? ?while (ch = getchar() != EOF)
//?? ?{
//?? ??? ?putchar(ch);
//?? ?}
//?? ?//char p[20] = { 0 };
//?? ?//printf("请输入密码:");
//?? ?//scanf("%s", p);
//?? ?int ch = 0;
//?? ?while ((ch = getchar()) != EOF)
//?? ?{
//?? ??? ?if (ch < '0' || ch>'9')
//?? ??? ??? ?continue;
//?? ??? ?putchar(ch);
//?? ?}
//?? ?return 0;
//}
//int main()
//{
//?? ?int n=0 ;
//?? ?int sum = 1;
//?? ?int a = 0;
//?? ?scanf("%d", &n);
//?? ?for (int i = 1; i <= n; i++)
//?? ?{
//?? ??? ?sum = sum*i;
//?? ??? ?a = a + sum;
//?? ?}
//?? ?printf("%d\n", sum);
//?? ?printf("%d", a);
//?? ?return 0;
//}
//找到有序数组中的k值的下标
//int main()
//{
//?? ?char arr[10] = { 1,2,3,4,5,6,7,8,9 };
//?? ?int k = 17;
//?? ?int sz = sizeof(arr) / sizeof(arr[0]);
//?? ?int left = 0;
//?? ?int right = sz-1;
//?? ?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("找到了 k的下标为:%d",mid);
//?? ??? ??? ?break;
//?? ??? ?}
//?? ??? ?if (left < right)
//?? ??? ?{
//?? ??? ??? ?printf("找不到");
//?? ??? ?}
//?? ?}
//
//?? ?return 0;
//}
//演示多个字符从两端，向中间汇集
//int main()
//{
//?? ?char arr1[] = "welcome to china!!!!!";
//?? ?char arr2[] = "#####################";
//?? ?int left = 0;
//?? ?int right = strlen(arr1) - 1;
//?? ?while (left <= right)
//?? ?{
//?? ??? ?arr2[left] = arr1[left];
//?? ??? ?arr2[right] = arr1[right];
//?? ??? ?printf("%s\n", arr2);
//?? ??? ?left++;
//?? ??? ?right--;
//?? ?
//?? ?}
//?? ?
//?? ?return 0;
//
//
//}
//模拟登录界面
int main()
{
?? ?int i = 0;
?? ?char password[20] = {0};
?? ?for (i = 0; i < 3; i++)
?? ?{
?? ??? ?printf("请输入密码:");
?? ??? ?scanf("%s", &password);
?? ??? ?if (strcmp(password, "123456") == 0)
?? ??? ?{
?? ??? ??? ?printf("密码正确\n");
?? ??? ??? ?break;
?? ??? ?}
?? ??? ?else
?? ??? ?{
?? ??? ??? ?printf("密码错误\n");
?? ??? ??? ?
?? ??? ?}
?? ?}
?? ?if (i == 3)
?? ??? ?printf("三次密码均错误\n");
?? ?return 0;
}
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