• 嵌入式工程师笔试题一


    1、将一个字符串逆序 

     

    #include<stdio.h>
    #include<string.h>
    #include<malloc.h>
    
    
    char *mystrrev(char *const dest,const char *const src)
    {
        if( dest==NULL && src==NULL )
            return NULL;
    
        int val_len = strlen(src);
    
        dest[val_len] = '';
        int i;
        for( i=0; i<val_len; i++ ){
        *(dest+i) = *(src+val_len-1-i);
        }
        return dest;
    
    }
    int main( )
    {
        char *str="asdfa";
        char *str1=NULL;
        str1 = (char *)malloc(20);
        if( str1 == NULL )
        {
            printf("molloc failed!
    ");
        }
        printf("%s
    ", mystrrev(str1,str));
        free(str1);
        str1=NULL;
        return 0;
    }

     

    2、将一个链表逆序 

     

     1 #include<stdio.h>
     2 #include<malloc.h>
     3 
     4 typedef struct List{
     5     int data;
     6     struct List *next;
     7 }List;
     8 
     9 List *list_create( void )
    10 {
    11     List *head,*tail,*p;
    12     int e;
    13     head = (List *)malloc(sizeof(List));
    14     tail = head;
    15     printf("
    List Create,input number(end of 0):");
    16     scanf("%d",&e);
    17     while( e )
    18     {
    19         p = (List *)malloc(sizeof(List));
    20         p->data = e;
    21         tail->next = p;
    22         tail = p;
    23         scanf("%d",&e);
    24     }
    25     tail->next=NULL;
    26     return head;
    27 }
    28 
    29 List *list_reverse(List *head)
    30 {
    31     List *p,*q,*r;
    32     p = head;
    33     q = p->next;
    34     while(q!=NULL)
    35     {
    36         r=q->next;
    37         q->next=p;
    38         p=q;
    39         q=r;
    40     }
    41     head->next = NULL;
    42     head = p;
    43 
    44     return head;
    45 }
    46 
    47 void main( )
    48 {
    49     List *head,*p;
    50     int d;
    51     head = list_create( );
    52     printf("
    ");
    53     for( p=head->next; p; p=p->next )
    54     {
    55         printf("--%d--",p->data);
    56     }
    57     head = list_reverse(head);
    58     printf("
    ");
    59     for( p=head; p->next; p=p->next )
    60         printf("--%d--",p->data);
    61 
    62 }
    View Code

     

    3、计算一个字节里(byte)里面有多少bit被置

     

     1 #include<stdio.h>
     2 
     3 #define N 10
     4 #ifndef BYTE
     5 typedef unsigned char BYTE;
     6 #endif
     7 
     8 int comb(BYTE b[ ],int n)
     9 {
    10     int count=0;
    11     int bi,bj;
    12     BYTE cc=1,tt;
    13 
    14     for( bi=0; bi<n; bi++ )
    15     {
    16         tt=b[bi];
    17         for( bj=0; bj<8; bj++ )
    18         {
    19             if( (tt&cc) == 1 )
    20             {
    21                 count++;
    22             }
    23             tt = tt/2;
    24         }
    25     }
    26     return count;
    27 }
    28 
    29 int main( )
    30 {
    31     BYTE b[10] = {3,3,3,11,1,1,1,1,1,1};
    32     printf("%d
    ",comb(b,N));
    33     return 0;
    34 }
    View Code

     

    4、在一个字符串中找到可能的最长的子字符串,

    该函数在一个字符串中找到可能的最长的子字符串,且该字符串是由同一字符组成的。

     

     1 #include<stdio.h>
     2 #include<stdlib.h>
     3 #include<string.h>
     4 
     5 char * search( char *cpsource, char ch )
     6 {
     7     char *cpTemp=NULL,*cpDest=NULL;
     8     int iTemp,iCount=0;
     9     while( *cpsource )
    10     {
    11         if( *cpsource == ch )
    12         {
    13             iTemp = 0;
    14             cpTemp = cpsource;
    15             while( *cpsource == ch )
    16             {
    17                 ++iTemp;
    18                 ++cpsource;
    19             }
    20             if( iTemp > iCount )
    21             {
    22                 iCount = iTemp;
    23                 cpDest = cpTemp;
    24             }
    25             if( !*cpsource )
    26                 break;
    27         }
    28         ++cpsource;
    29     }
    30     return cpDest;
    31 }
    32 
    33 int main( )
    34 {
    35     char s[200];
    36     char ch;
    37     printf("请输入您要处理的字符串:
    ");
    38     while( gets(s) )
    39     {
    40           printf("请输入匹配字符:
    ");
    41 
    42           scanf("%c",&ch);
    43           getchar( );
    44           printf("%c
    ",ch);
    45           printf("%s
    ",search(s,ch));
    46           printf("请输入您要处理的字符串:
    ");
    47     }
    48     return 0;
    49 }
    View Code

     

    5、整数转换为字符串

     

     1 #include<stdio.h>
     2 #include<string.h>
     3 
     4 void reverse( char s[ ] )
     5 {
     6     char c;
     7     int i=0;
     8     int j;
     9     for( j=strlen(s)-1; i<j; j-- )
    10     {
    11         c = s[i];
    12         s[i] = s[j];
    13         s[j] = c;
    14         i++;
    15     }
    16 }
    17 
    18 void IntegerToString( char s[ ],int n )
    19 {
    20     int i=0;
    21     int sign;
    22     if( (sign=n)<0 )
    23         n=-n;
    24     do
    25     {
    26         s[i++] = n%10+'0';
    27     }while( (n=n/10)>0 );
    28     if( sign < 0 )
    29         s[i++] = '-';
    30     s[i] = '';
    31     reverse(s);
    32 }
    33 int main( )
    34 {
    35     int m;
    36     char c[100];
    37     printf("请输入整数m:");
    38     scanf("%d",&m);
    39     IntegerToString(c,m);
    40     printf("integer = %d string = %s
    ",m,c);
    41 }
    View Code

     6、字符串转换为整数 

     1 #include<stdio.h>
     2 #include<string.h>
     3 
     4 int MyAtoI( char str[] )
     5 {
     6     int i;
     7     int weight = 1;
     8     int rtn = 0;
     9 
    10     for( i=strlen(str)-1; i>=0; i-- )
    11     {
    12         rtn += (str[i]-'0')*weight;
    13         weight *= 10;
    14     }
    15     return rtn;
    16 }
    17 
    18 void main( )
    19 {
    20     char str[32];
    21 
    22     printf("Input a string:");
    23     gets(str);
    24     printf("%d
    ",MyAtoI(str));
    25 }
    View Code

     

     

     

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  • 原文地址:https://www.cnblogs.com/huangxingkezhan/p/3356327.html
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