c语言练习题
2021-10-21 23:08:58

#include<stdio.h>
#include<math.h>
int main()
{
  int i = 0;
  for (i = 0; i < 100000; i++)
  {
    //判断i是否为水仙花数(自幂数）
    //1.判断i有几位数
    int n = 1;
    int tmp = i;
    int sum = 0;
    while (tmp/=10)
      {
        n++;
      }
    //2.计算出i的每位的n次方
    tmp = i;
    while (tmp)
    {
      sum += pow(tmp % 10, n);
      tmp /= 10;
    }
    //3.判断i是否为水仙花数
    if (i == sum)
    {
      printf("%d ", i);
    }
  }
  return 0;
}

int main()
{
  int money = 0;
  int total = 0;
  int empty = 0;
  scanf("%d", &money);
  //买回来的汽水喝掉
  total = money;
  empty = money;
  //换回来的汽水
  while (empty >= 2)
  {
    total += empty / 2;
    empty = empty / 2 + empty % 2;
  }
  printf("total: %d", total);
  return 0;
}

move(int arr[], int sz)
{
  int left = 0;
  int right = sz - 1;
  while (left < right)
  {
    while (left < right&&arr[left] % 2 == 1)//左边找偶数
    {
      left++;
    }
    while (left < right&&arr[right] % 2 == 0)//右边找奇数
    {
      right--;
    }
    if (left < right)//交换
    {
      int tmp = arr[left];
      arr[left] = arr[right];
      arr[right] = tmp;
      left++;//左边下一个数
      right--;//右边下一个数
    }
  }
  
}

int main()
{
  int arr[] = { 1, 3, 7, 10, 6, 1, 3, 5, 3 };
  int sz = sizeof(arr) / sizeof(arr[0]);
  move(arr, sz);
  int i = 0;
  for (i = 0; i < sz; i++)
  {
    printf("%d ", arr[i]);
  }

  return 0;
}

int main()
{
  int arr[10][10] = { 0 };
  int i = 0;
  int j = 0;
  for (i = 0; i < 10; i++)
  {
    for (j = 0; j <10; j++)
    {
      if (j == 0)
      {
        arr[i][j] = 1;
      }
      if (i == j)
      {
        arr[i][j] = 1;
      }
      if (i>=2 && j >= 1)
      {
        arr[i][j] = arr[i - 1][j - 1] + arr[i - 1][j];
      }
    }
  }
  for (i = 0; i < 10; i++)
  {
    for (j = 0; j <= i; j++)
    {
      printf("%d ", arr[i][j]);
    }
    printf("
");
  }
  return 0;

}

int main()
{
  int killer = 0;
  for (killer = 'a'; killer <= 'd';killer++)
  if (((killer != 'a') + (killer == 'c') + (killer == 'd') + (killer != 'd')) == 3)
  {
    printf("killer:%c ", killer);
  }
  return 0;
}

int main()
{
  int a = 0;
  int b = 0;
  int c = 0;
  int d = 0;
  int e = 0;
  for (a = 1; a <= 5; a++)
  {
    for (b = 1; b <= 5; b++)
    {
      for (c = 1; c <= 5; c++)
      {
        for (d = 1; d <= 5; d++)
        {
          for (e = 1; e <= 5; e++)
          {
            if ((b == 2) + (a == 3) == 1 &&
              (b == 2) + (e == 4) == 1 &&
              (c == 1) + (d == 2) == 1 &&
              (c == 5) + (d == 3) == 1 &&
              (e == 4) + (a == 1) == 1 )
             if(a*b*c*d*e==120)
              printf("a=%d b=%d c=%d d=%d e=%d
", a, b, c, d, e);
          }
        }
      }
    }
  }

  return 0;
}

#include<string.h>
void left_move(char a[], int sz,int k)
{
  while (k)
  {
    int i = 0;
    int tmp = 0;
    tmp = a[i];
    for (i = 0; i < sz-2; i++)
    {
      a[i] = a[i + 1];
    }
    a[sz - 2] = tmp;
    k--;
  }

  
}

int main()
{
  char a[] = "ABCD";
  int sz = 0;
  int k = 0;
  sz = sizeof(a) / sizeof(a[0]);
  scanf("%d", &k);
  left_move(a, sz,k);
  printf("%s", a);
  return 0;
}

#include<stdio.h>
#include<string.h>
int is_left_move(char* str1, char* str2)
{
  int len1 = strlen(str1);
  int len2 = strlen(str1);
  if (len1 != len2)
  {
    return 0;
  }


  //1.在str1后面追加一个str1
  //strcat(str1, str1);strcat函数无法追加自己
  strncat(str1, str1,len); //abcdefabcdef
  //2.判断str2指向的字符串是否是str1指向的字符串的子串
  char* ret = strstr(str1, str2);
  if (ret == NULL)
  {
    return 0;
  }
  else
  {
    return 1;
  }
}

int main()
{
  char arr1[30] = "abcdef";
  char arr2[] = "cdefab";
  int ret = is_left_move(arr1, arr2);
  if (ret == 1)
  {
    printf("Yes
");
  }
  else
  {
    printf("No
");
  }
  return 0;
}

int FindNum(int arr[3][3],int k,int row, int col)
{
  int x = 0;
  int y = col - 1;
  while (x<=row-1&&y>=0)
  {
    if (arr[x][y] > k)
    {
      y--;
    }
    else if (arr[x][y] < k)
    {
      x++;
    }
    else
    {

      return 1;
    }
  }
  return 0;
}


int main()
{
  int arr[3][3] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };
  int k = 7;//找7
  int ret = FindNum(arr, k, 3, 3);
  if (ret == 1)
  {
    printf("找到了
");
  }
  else
  {
    printf("找不到
");
  }
  return 0;
}

int FindNum(int arr[3][3],int k,int* px, int* py)
{
  int x = 0;
  int y = *py - 1;
  while (x<=*px-1&&y>=0)
  {
    if (arr[x][y] > k)
    {
      y--;
    }
    else if (arr[x][y] < k)
    {
      x++;
    }
    else
    {
      *px = x;
      *py = y; 
      return 1;
    }
  }
  return 0;
}


int main()
{
  int arr[3][3] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };
  int k = 7;//找7
  int x = 3;
  int y = 3;
  //返回型参数
  int ret = FindNum(arr, k, &x,&y);
  if (ret == 1)
  {
    printf("找到了,坐标为：(%d,%d)
",x,y);
  }
  else
  {
    printf("找不到
");
  }
  return 0;
}