嵌入式软件工程师主要从事嵌入式软件开发工作。涉及应用层以及底层软件开发和设计工作。下面就由学习啦小编为大家介绍一下嵌入式软件工程师面试题的文章，欢迎阅读。
嵌入式软件工程师面试题篇1
1、将一个链表逆序
| LinkList *reverse(LinkList *head)
{
LinkList *p1,*p2 = NULL,*p3 = NULL;
if(head == NULL || head->next == NULL)
return head;
p1 = head->next;
while(p1!=NULL)
{
p3 = p1->next;
p1->next = p2;
p2 = p1;
p1 = p3;
}
head->next = p2;
// head = p2;
return head;
} |
2、计算一个字节里(byte)里面有多少bit被置1
| #include <stdio.h>
int comb(const int c)
{
int count = 0;
int i = 0;
int cc = c;
while(i++<8)
{
if((cc&1)==1)
{
count++;
}
cc = cc>>1;
}
return count;
}
int main()
{
const int c = 0xcf;
printf("%d\n",comb(c));
return 1;
} |
嵌入式软件工程师面试题篇2
1、在一个字符串中找到可能的最长的子字符串
| #include <stdio.h>
#include <stdlib.h>
#include <string.h>
char *commanstring(char shortstring[],char longstring[])
{
int i,j;
char *substring = malloc(256);
if(strstr(longstring,shortstring)!=NULL)
return shortstring;
for(i=strlen(shortstring)-1;i>0;i--)
{
for(j=0;j<=strlen(shortstring)-i;j++)
{
memcpy(substring,&shortstring[j],i);
substring[i]='\0';
if(strstr(longstring,substring)!=NULL)
return substring;
}
}
return NULL;
}
void main(void)
{
char *str1 = "aocdfe";
char *str2 = "pmcdfa";
char *comman = NULL;
if(strlen(str1)>strlen(str2))
comman= commanstring(str2,str1);
else
comman = commanstring(str1,str2);
printf("the longest comman string is:%s\n",comman);
}
|
2、字符串转换为整数
| #include <stdio.h>
#include <string.h>
void reverse(char s[])
{ //字符串反转
int c, i=0, j;
for(j=strlen(s)-1;i<j;j--)
{ c=s[i];
s[i]=s[j];
s[j]=c;
i++;
}
}
void IntegerToString(char s[],int n)
{ int i=0,sign;
if((sign=n)<0)//如果是负数，先转成正数
n=-n;
do //从个位开始变成字符,直到最高位,最后应该反转
{ s[i++]=n%10+'0';
}while((n=n/10)>0);
//如果是负数，补上负号
if(sign<0)
s[i++]='-';
s[i]='\0';//字符串结束
reverse(s);
}
void main()
{ int m;
char c[100];
m =215;
IntegerToString(c,m);
printf("integer = %d string = %s\n", m, c);
} |
嵌入式软件工程师面试题篇3
1、整数转换为字符串
| #include <stdio.h>
#include <string.h>
int Atoi(char str[])
{
int i;
int weight = 1; // 权重
int rtn = 0; // 用作返回
for(i = strlen(str) - 1; i >= 0; i--)
{
rtn += (str[i] - '0')* weight; //
weight *= 10; // 增重
}
return rtn;
}
void main()
{
char str[32];
printf("Input a string :");
gets(str);
printf("%d\n", Atoi(str));
} |
2、将一个字符串逆序
| #include <stdio.h>
#include <string.h>
char *strconv(char *p)
{
int length = strlen(p);
char *ptr = p;
char *ptr_1 = p + length -1;
while(ptr < ptr_1)
{
char c = *ptr;
*ptr = *ptr_1;
*ptr_1 = c;
++ptr;
--ptr_1;
}
return p;
}
int main()
{
char str[]="abcdef1234";
char *p;
p = strconv(str);
printf("%s",p);
return 1;
} |
'
;if(strstr(longstring
,substring
)!=NULL)returnsubstring
;}}returnNULL;}voidmain
(void){char*str1
="aocdfe";char*str2
="pmcdfa";char*comman
=NULL;if(strlen(str1
)>strlen(str2
)) comman
=commanstring
(str2
,str1
);else comman
=commanstring
(str1
,str2
);printf("the longest comman string is:%s\n",comman
);} 