打卡4.折半法#define_CRT_SECURE_NO_W-CSDN blink-领先的开发者技术社区

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4 年前

trueweixin_57648053

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4.折半法

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
   int k = 0;
   scanf("%d", &k);
   int arr[] = { 1,2,3,4,5,6,7,8,9,10 };
   int a = sizeof(arr) / sizeof(arr[0]);
   int left = 0;
int right = a-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 if (arr[mid] == k)
       {
           printf("找到啦,在%d\n",mid);
           break;
       }
   }
   if (left > right)
       printf("找不到");

   return 0;
}
5.求阶乘之和

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
   int i = 0;
   int date = 0;
   int muti = 1;
   int sum = 0;
   scanf("%d\n", &date);
   for (i = 1; i < date + 1;i++)
   {
       muti = muti * i;
       sum += muti;
   }
   printf("%d\n", sum);
   return 0;
}

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菜鸟入门C语言打卡1.求一百以内三的倍数#include<stdio.h>int main(){ int i = 0; for (i = 0; i < 100; i++) { if ((i % 3) == 0) { printf("%d ", i); } } return 0;}2.求输入三个数最大值#define _CRT_SECURE_NO_WARNINGS 1#include<stdio.h>int max(int x, int y){ if (x > y) { return x; } else { return y; }}int main(){ int b; int c; int a; a = b = c = 0; scanf("%d%d%d", &a ,& b, & c); a = max(a, max(b, c)); printf("%d\n", a); return 0;}3.输入正确密码，三次机会#define _CRT_SECURE_NO_WARNINGS 1#include<stdio.h>int main(){ int key = 0; int right = 12345; int i = 0; for (i = 0; i < 3; i++) { printf("请输入密码\n"); scanf("%d", &key); if (key == right) { printf("密码正确\n"); } else { printf("密码错误\n"); } } return 0;}

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