实验六

#include<stdio.h>
#include<stdlib.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_s("%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);
    system("pause");
    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;
        if(item<*(x+mid))
            high=mid-1;
        if(item>*(x+mid))
            low=mid+1;
    }
    return -1;
}

 

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

int main()
{
    char s[81];
    
    printf("Enter a string :\n");
    gets(s);
    /***ERROR******/
    fun(s);
    printf("The string after deleted:\n");
    puts(s);

    return 0;
}

 

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

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

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

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

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

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

    /**ERROR**/
    a[i] = '\0';
}

int main()
{
    char s[81];

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

    return 0;
}

 

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

#define N 80
int isPalindrome(char *s);      // 函数声明

int main()
{
    char str[N];
    int flag;

    printf("Enter a string:\n");
    gets(str);

    flag = isPalindrome(str);   // 函数调用

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

    return 0;
}

// 函数定义
// 功能：判断指针s指向的字符串是否是回文串，如果是，返回1；否则，返回0。
int isPalindrome(char *s)
{
    char *a,*b;
    a=s;
    b=s+strlen(s)-1;
    while(a<b)
    {
        if(*a==*b)
        {
            a++;
            b--;
        }
        else
            return 0;
    }
    if(a>=b)
        return 1;
}

 

#include <stdio.h>
#define N 80

int count(char *str, char *substr); // 函数声明

int main()
{
    char str[N], substr[N];
    int n;

    gets(str);      // 输入母串
    gets(substr);   // 输入子串
    n = count(str, substr);     // 函数调用
    printf("%d\n", n);

    return 0;
}

int count(char *str, char *substr)
{
    int i, j, k;
    int num = 0;

    for(i=0;str[i]!='\0'; ++i)
        for(j=i, k=0; substr[k] == str[j]; k++, j++)
            if(substr[k+1] == '\0')
            {
                num++;
                break;
            }
    
    return(num);
}