2023年嵌入式工程师面试题经典.doc

1、将一种字符串逆序
2、将一种链表逆序
3、计算一种字节里（byte）里面有多少bit被置1
4、搜索给定旳字节(byte)
5、在一种字符串中找到也许旳最长旳子字符串
6、字符串转换为整数
7、整数转换为字符串

style="MARGIN: 0px; COLOR: rgb(102,102,102); LINE-HEIGHT: 150%" wrap="break-word"1、char *strconv(char *p)

{

int i,length;

char temp;

length = strlen(p);

for(i = 0;i < length/2;i++)

{

temp = *(p + i);

*(p + i) = *(p + length - 1 - i);

*(p +length - 1 - i) = temp;

}

return p;

}

int main()

{

char src[100];

char *p;

scanf("%s",src);

p = strconv(src);

printf("%s\n",p);

return 0;

}

style="MARGIN: 0px; COLOR: rgb(102,102,102); LINE-HEIGHT: 150%" wrap="break-word"3、int cal(int data) //calculation the number of bit in one byte

{

int a;

int count = 0;

a = data % 100;

while (a != 0)

{

count += a % 2;

a /= 2;

}

return count;

}

int main()

{

int d,count;

scanf("%d",&d);

count = cal(d);

printf("%d of one\n",count);

return 0;

}

style="MARGIN: 0px; COLOR: rgb(102,102,102); LINE-HEIGHT: 150%" wrap="break-word"4、#include<stdio.h>

#include<string.h>

void findmax(char *p)

{

int j = 0,max = 0;

int count = 0;

char record[200];

char recordmax[200];

for(int i = 0;;i++)

{

if((*(p + i) == ' ') || (*(p + i) == '\0'))

{

if(count > max)

{

max = count;

record[j] = '\0';

strcpy(recordmax,record);

}

count = 0;

j = 0;

}

else

{

record[j] = *(p + i);

count ++;

j ++;

}

if(*(p + i) == '\0')

break;

}

printf("%s\n",recordmax);

}

int main()

{

char str[]="zeng weidsfdsaf langd hah";

printf("%s\n",str);

findmax(str);

return 0;

}

style="MARGIN: 0px; COLOR: rgb(102,102,102); LINE-HEIGHT: 150%" wrap="break-word"#include<stdio.h>

#include<stdlib.h>

#include<string.h>

typedef struct shopping

{

char goods[100];

struct shopping *next;

}SHOP;

SHOP *buildlink() //创立链表

{

char goods[100];

SHOP *head,*p,*h;

p = (SHOP *)malloc(sizeof(SHOP));

head = p;

head->next = NULL;

printf("Input three goods:");

for(int i = 0;i < 3;i++)

{

scanf("%s",goods);

p = (SHOP *)malloc(sizeof(SHOP));

strcpy(p->goods,goods);

p->next = NULL;

if(head->next == NULL)

{

head->next = p;

h = p;

}

else

{

h->next = p;

h = h->next;

}

}

return head;

}

void showlink(SHOP *head) //显示链表

{

SHOP *p;

p = head->next;

while(p != NULL)

{

printf("%s ",p->goods);

p = p->next;

}

printf("\n");

}

SHOP *revlink(SHOP *head) //反转链表

{

SHOP *p,*newp;

p = head->next;

head->next = NULL;

while(p != NULL)

{

newp = p;

p = p->next;

newp->next = head->next;

head->next = newp;

}

return head;

}

int delnode(SHOP *head,char *str)

{

//delete success return 1,else return 0

SHOP *q,*p = head;

while(p->next != NULL)

{

q = p;

p = p->next;

if(!strcmp(str,p->goods))

{

q->next = p->next;

free(p);

//p = q->next;

return 1;

}

}

return 0;

}

int main()

{

SHOP *head;

SHOP *newhead;

head = buildlink();

showlink(head);

newhead = revlink(head);

showlink(newhead);

showlink(head);

printf("Delete a node:");

char str[50];

scanf("%s",str);

int i;

i = delnode(head,str);

showlink(head);

if(i == 1)

printf("Delete successful!\n");

return 0;

}

style="MARGIN: 0px; COLOR: rgb(102,102,102); LINE-HEIGHT: 150%" wrap="break-word"#include<stdio.h>

#include<stdlib.h>

#include<string.h>

typedef struct shopping

{

char goods[100];

struct shopping *next;

}SHOP;

SHOP *buildlink() //创立链表

{

char goods[100];

SHOP *head,*p,*h;

p = (SHOP *)malloc(sizeof(SHOP));

head = p;

head->next = NULL;

printf("Input three goods:");

for(int i = 0;i < 3;i++)

{

scanf("%s",goods);

p = (SHOP *)malloc(sizeof(SHOP));

strcpy(p->goods,goods);

p->next = NULL;

if(head->next == NULL)

{

head->next = p;

h = p;

}

else

{

h->next = p;

h = h->next;

}

}

return head;

}

void showlink(SHOP *head) //显示链表

{

SHOP *p;

p = head->next;

while(p != NULL)

{

printf("%s ",p->goods);

p = p->next;

}

printf("\n");

}

SHOP *revlink(SHOP *head) //反转链表

{

SHOP *p,*newp;

p = head->next;

head->next = NULL;

while(p != NULL)

{

newp = p;

p = p->next;

newp->next = head->next;

head->next = newp;

}

return head;

}

int delnode(SHOP *head,char *str)

{

//delete success return 1,else return 0

SHOP *q,*p = head;

while(p->next != NULL)

{

q = p;

p = p->next;

if(!strcmp(str,p->goods))

{

q->next = p->next;

free(p);

//p = q->next;

return 1;

}

}

return 0;

}

int main()

{

SHOP *head;

SHOP *newhead;

head = buildlink();

showlink(head);

newhead = revlink(head);

showlink(newhead);

showlink(head);

printf("Delete a node:");

char str[50];

scanf("%s",str);

int i;

i = delnode(head,str);

showlink(head);

if(i == 1)

printf("Delete successful!\n");

return 0;

}

style="MARGIN: 0px; COLOR: rgb(102,102,102); LINE-HEIGHT: 150%" wrap="break-word"#include "stdio.h"

#include "stdlib.h"

int myAtoi(char *s);

void main()

{

int i;

char *s=(char *)malloc(10*sizeof(char));

if (s==NULL) {

printf("fail to malloc s\n");

return;

}

while(1) {

scanf("%s",s);

if ((*s)=='q') {

break;

}

i = myAtoi(s);

printf("%d\n",i);

}

}

int myAtoi(char *s)

{

int i=0;

int flag=0;

if (s==NULL)return 0;

if (*s=='+'||*s=='-')

{

if (*s=='-') {

flag=1;

}

s++;

}

while(*s!='\0' && *s>='0' && *s<='9') {

i=(int)(*s)-'0'+i*10;

s++;

}

if (flag)i=-i;

return i;

}