7月10日 今日所学 整理分享

#define _CRT_SECURE_NO_WARNINGS 1

#include <stdio.h>

#include <string.h>

#include <windows.h>

#include<stdlib.h>







int main()
{
	int arr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
	int k = 6;
	int se = sizeof (arr) / sizeof (arr[0]);
	int left = 0;
	int right = se - 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，下标是 %d\n", mid);
			break;
		}
	}
	if (left>right)
	{
		printf("找不到\n");
	}
	return 0;
}








int main()
{
	int arr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
	int b = 4;
	int i = 0;
	int se = sizeof (arr) / sizeof (arr[0]);
	for (i = 0; i < se;i++)
	{

		if (b == arr[i])
		{
			printf("找到了，下标是 %d\n", i);
			break;
		}
		
	}
	
	return 0;
}
 









int main()
{
	int i = 0;
	int n = 0;
	int ret = 1;
	int sum = 0;
	for (n = 1; n <= 7; n++)
	{
		ret = ret * n;
		sum = sum + ret;
	}

	printf("sum = %d\n", sum);
	return 0;
}








int main()
{
	int i = 0;
	int n = 0;
	int sum = 0;
	for (n = 1; n <=7; n++)
	{
		int ret = 1;
		for (i=1; i<=n; i++)
		{
			ret = ret * i;

		}
		sum = sum + ret;
	}
	
	printf("sum = %d\n", sum);
	return 0;
}











int main()
{
	int i = 0;
	int n = 0;
	int ret = 1;
	scanf("%d", &n);
	for(i = 1; i<=n; i++)
	{
		ret = ret * i;
		
	}
	printf("ret = %d\n", ret);
	return 0;
}	 










int main()
{
	char arr1[] = { "welconme to 71231!!!!!!!"};
	char arr2[] = { "########################" };
	int left = 0;
	int right = sizeof(arr1) / sizeof(arr1[0])-2;//实际是 welcome to 71231!!!!!!!\0   多了第一个\0和初始的下标0  so 减2
	while (left<= right)
	{
		arr2[left] = arr1[left];
		arr2[right] = arr1[right];
		left++;
		right--;
		Sleep(800);
		system("cls");
		printf("%s\n", arr2);
	}
	return 0;
}











///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
////int main()
////{
////	
////	char accounts[] = {0};
////	char password[] = {0};
////	int i = 0;
////		printf("请输入账号:>");
////		scanf("%s", accounts);
////		(strcmp(accounts, "1234") == 0);
////	for (i = 1; i <= 3;i++)
////	{
////		printf("请输入密码:>");
////		scanf("%s", password);
////		if (strcmp(password, "z12345") == 0)//==不能用来比较两个字符串是否相等，应该使用一个库函数-strcmp
////		{
////			printf("登陆成功\n");
////			break;
////		}	
////		else
////		{
////			printf("账号或者密码输入错误\n");
////		}
////		if (i == 3)
////		{
////			printf("三次均错误，账号已冻结\n");
////		}
////	}
////	return 0;
////}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////









int main()
{
	int a = 0;
	int b = 0;
	int c = 0;
	scanf("%d%d%d", &a, &b, &c);
	if (a < b)
	{
		int tmp = a;
		a = b;
		b = tmp;
	}
	if (a < c)
	{
		int tmp = a;
		a = c;
		c = tmp;
	}
	if (b < c)
	{
		int tmp = b;
		b = c;
		c = tmp;
	}
	printf("%d %d %d\n", a, b, c);
	return 0;
}










int main()
{
	int a = 44;
	int b = 34;
	int r = 0;
	scanf("%d%d", &a, &b);
	while (r = a%b)
	{
		r = a % b;
		a = b;
		b = r;
	}
	printf("%d\n", b);
	return 0;

}