实验6

实验1

#include <stdio.h>
#define N 5

int binarySearch(int* x, int n, int item);

int main()
{
    int a[N] = { 2, 7, 19, 45, 66 };
    int i, index, key;

    printf("数组a中的数据:\n");
    for (i = 0; i < N; i++)
        printf("%d ", a[i]);
    printf("\n");

    printf("输入待查找的数据项: ");
    scanf("%d", &key);
      index= binarySearch( a,N, key);
    if (index >= 0)
        printf("%d在数组中，下标为%d\n", key, index);
    else
        printf("%d不在数组中\n", key);

    return 0;
}
int binarySearch(int* x, int n, int item)
{
    int low, high, mid;

    low = 0;
    high = n - 1;

    while (low <= high)
    {
        mid = (low + high) / 2;

        if (item == *(x + mid))
            return mid;
        else if (item < *(x + mid))
            high = mid-1;
        else
            low = mid+1;
    }
    return -1;
}

 

 实验2

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
void fun(char* a)
{
    int i=0;
    char* p = a;
    while (*p && *p == '*')
    {
        a[i] = *p;
        i++;
        p++;
    }
    while (*p)
    {
   
        if (*p != '*')
        {
            a[i] = *p;
            i++;
        }
        p++;
    }
    a[i] = '\0';
}

int main()
{
    char s[81];

    printf("Enter a string :\n");
    gets(s);
    fun(s);
    printf("The string after deleted:\n");
    puts(s);

    return 0;
}

 实验3

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void fun(char* a)
{
    int i=0;
    char* t = a, * f = a;
    char* q = a;

    while (*t)
        t++;
    t--;

    while (*t == '*')
        t--;

    while (*f == '*')
        f++;

    while (q < f)
    {
        a[i] = *q;
        q++;
        i++;
    }

    while (q < t)
    {
        if (*q != '*')
        {
            a[i] = *q;
            i++;
        }
        q++;
    }

    while (*q)
    {
        a[i] = *q;
        i++;
        q++;
    }
    a[i] = '\0';
}

int main()
{
    char s[81];

    printf("Entre a string:\n");
    gets(s);
    fun(s);
    printf("The sting after deleted:\n");
    puts(s);

    return 0;
}

 实验4

#include <stdio.h>
#include <string.h>

#define N 80
int isPalindrome(char* s);      

int main()
{
    char str[N];
    int flag;
    printf("Enter a string:\n");
    gets(str);

    flag = isPalindrome(str);  

    if (flag)
        printf("YES\n");
    else
        printf("No\n");

    return 0;
}

int isPalindrome(char* s)
{
   int i,n=1,a;
   a=strlen(s);
   for(i=0;*(s+i)!='\0';i++)
   {
       if(*(s+i)!=*(s+a-1-i))
         {
        n=0; 
           break; 
      }
   }
   if(n==1)
         return 1;
   return 0;
}

 实验5

#include <stdio.h>
#include <string.h>

#define N 80
int isPalindrome(char* s);      

int main()
{
    char str[N];
    int flag;
    printf("Enter a string:\n");
    gets(str);

    flag = isPalindrome(str);  

    if (flag)
        printf("YES\n");
    else
        printf("No\n");

    return 0;
}

int isPalindrome(char* s)
{
   int i,n=1,a;
   a=strlen(s);
   for(i=0;*(s+i)!='\0';i++)
   {
       if(*(s+i)!=*(s+a-1-i))
         {
        n=0; 
           break; 
      }
   }
   if(n==1)
         return 1;
   return 0;
}