1 #include <iostream>
 2 using namespace std;
 3
 4 typedef struct node
 5 {
 6     int val;
 7     struct node *next;
 8 }node;
 9
10 node* createList(int n)
11 {
12     node *head;
13     node *pHead;//永远指向最新的节点
14     node *pNext;//指向新添加的节点
15     for(int i=0;i<n;i++)
16     {
17         if(i==0)
18         {
19             head=new node;
20             cout<<"请输入第1个元素（头结点）的值:";
21             cin>>head->val;
22             head->next=NULL;
23             pHead=head;
24         }
25         else
26         {
27             pNext=new node;
28             cout<<"请输入第"<<i+1<<"个元素的值：";
29             cin>>pNext->val;
30             pNext->next=NULL;
31             pHead->next=pNext;
32             pHead=pNext;
33         }
34     }
35     return head;
36 }
37
38 void mergeTwoList(node *headA,node *headB)//headA的长度大于等于headB的
39 {
40     if(headA==NULL||headB==NULL)
41     {
42         return;
43     }
44     mergeTwoList(headA->next,headB->next);//递归实现
45     headB->next=headA->next;
46     headA->next=headB;
47 }
48
49 int main()
50 {
51     node *headA;
52     node *headB;
53     node *newList;
54     cout<<"新建链表A：\n";
55     headA=createList(5);
56     cout<<"新建链表B：\n";
57     headB=createList(3);
58     newList=headA;
59     mergeTwoList(headA,headB);
60     cout<<"合并后的新链表："<<endl;
61     while(newList!=NULL)
62     {
63         cout<<newList->val<<" ";
64         newList=newList->next;
65     }
66     return 0;
67 }

32位机上根据下面的代码，问哪些说法是正确的？（）signed char a = 0xe0;unsigned int b = a;unsigned char c = a;A. a>0 && c>0 为真 B. a == c 为真 C. b 的十六进制表示是：0xffffffe0 D.上面都不对

#include <stdio.h>int main(int argc, char *argv[]){    unsigned char a = -1;char b = a;    printf("%d  %d",a,b);

return 0;}

//结果：255  -1

#include <stdio.h>int main(int argc, char *argv[]){    unsigned short a = -1;short b = a;    printf("%d  %d",a,b);

return 0;}//结果：65535  -1

#include <stdio.h>int main(int argc, char *argv[]){

    unsigned int a = -1;int b = a;    printf("%d  %d",a,b);

return 0;}//结果 -1 -1

1.unsigned 类型转换为 signed类型的时候是直接复制到低位,高位为0.如果signed类型位数不够，只直接装载unsigned低位。

2.signed类型转换为unsigned类型的时候，也是将补码直接复制到低位,高位为符号位。如果unsigned位数不够，只直接装载signed低位。

 1 下面哪些选项能编译通过？
 2 int i;
 3 char a[10];
 4 string f();
 5 string g(string &str);
 6
 7 A. if(!!i){f();}
 8 B. g(f());
 9 C. a=a+1;
10 D. g("abc"); 

问下面的数据都存放在哪些存储区？int main()
{char *p = "hello,world";return 0;
}A. 堆和静态数据区
B. 栈和静态数据区
C. 栈和常量区
D. 栈和堆

#include <stdio.h>int find_value(int a[][4], int value, int x, int y)//(x,y)表示右上角坐标
{if ((x >= 0) && (y < 4)){if (a[x][y] ==  value)return 1;else if (a[x][y] > value)return find_value(a, value, x-1, y);elsereturn find_value(a, value, x, y+1);}return 0;
}int main()
{int a[4][4] = {{1, 2, 8, 9}, {2, 4, 9, 12}, {4, 7, 10, 13}, {6, 8, 11, 15}};int val;printf("Enter your number:");scanf("%d", &val);if(find_value(a, val, 3, 0))printf("Yes, find it\n");elseprintf("No, not find it\n");return 0;
}