实验5

Posted 2020-11-23 ras123

#include  <stdio.h>
#include <stdlib.h> 
const int N=5;

int binarySearch(int x[], int n, int item); // 函数声明 

int main() {
    int a[N]={2,7,19,45,66};
    int i,index, key;
    
    printf("数组a中的数据:
");
    for(i=0;i<N;i++)
       printf("%d ",a[i]);
    printf("
");
    
    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
", key, index);
    else
        printf("%d不在数组中
", 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;
        else if(item<x[mid])
            high = mid - 1;
        else
            low = mid + 1;
    }
    
    return -1;
}

#include  <stdio.h>
#include <stdlib.h> 
#define  N  10
int fun(int *a,int m)
{ 
    int low = 0, high = N-1, mid;
    /*************ERROR**************/
      while(low <= high)
      {  
        mid = (low+high)/2;
        /*************ERROR**************/
        if(m < *(a+mid))
             high = mid-1;
        /*************ERROR**************/
        else if(m > *(a+mid))
            low = mid+1;
        else  
            return(mid);
      }
      return(-1);
}

int main()
{  
    int i,a[N]={-3,4,7,9,13,24,67,89,100,180},k,m;
       printf("a数组中的数据如下:
");
       for(i=0;i<N;i++)
       printf("%d ",a[i]);
       printf("
Enter m: 
"); 
       scanf("%d",&m);
    /*************ERROR**************/
       k = fun(a,m);
       if (k>=0) 
       printf("m=%d,index=%d
",m,k);
       else 
       printf("Not be found!
");
    
    system("pause");
       return 0;
}

// 练习：使用选择法对字符串按字典序排序
#include <stdio.h>
#include <string.h>
#include <stdlib.h> 
void selectSort(char str[][20], int n ); // 函数声明，形参str是二维数组名 
int main() {
    char name[][20] = {"John", "Alex", "Joseph", "Taylor", "George"};
    int i;
    
    printf("输出初始名单:
");
    for(i=0; i<5; i++)
        printf("%s
", name[i]);
        
    selectSort(name, 5);  // 调用选择法对name数组中的字符串排序
    
    printf("按字典序输出名单:
");
    for(i=0; i<5; i++)
        printf("%s
", name[i]);
    
    system("pause");
    return 0;
} 

// 函数定义
// 函数功能描述：使用选择法对二维数组str中的n个字符串按字典序排序 
void selectSort(char str[][20], int n) {
    int i,j,k;
    char a[20] ;
    for(i=0;i<n-1;i++)
    {
        k=i;
        for(j=i+1;j<n;j++)
     
            if(strcmp(str[j],str[k])<0)
            k=j;
        if(k!=i){
            strcpy(a,str[i]);
            strcpy(str[i],str[k]);
            strcpy(str[k],a);
        }
    }
     
}

#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 :
");
      gets(s);
      /***ERROR******/
      fun(s);
      printf("The string after deleted:
");
      puts(s);
      
      system("pause");
    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:
");
    gets(s);
    /**ERROR**/
    fun(s);
    printf("The sting after deleted:
");
    puts(s);
    
    system("pause");
    return 0;
}