#include<stdio.h>
#include<stdbool.h>

bool Find(int (*num)[4],int rows,int column,int number)
{
    bool found = false;
    if(num!=NULL && rows>0 && column>0)
    {   
        int col = 0;
        int row = rows-1;
        while(col<column && row>=0)
        {   
            if((*num)[row*column+col] == number)
            {   
                found = true;
                break;
            }   
            if((*num)[row*column+col] < number)
                 ++col;
            else
                --row;    
        }   
    }   
    return found;
}
int main()
{
    int number;
    int num[4][4] = {{1,2,8,9},{2,4,9,12},{4,7,10,13},{6,8,11,15}};
    puts("please input your number:");
    scanf("%d",&number);
    bool res = false;
    res = Find(num,4,4,number);
    printf("res:%d\n",res);
    return 0;
}

#include<stdio.h>

void ReplaceBlank(char string[],int length)
{
    if(string==NULL && length<=0)
        return;
    int originalLen = 0;//字符串实际长度
    int numBlank=0,i=0;
    while(string[i] != '\0')
    {
        ++originalLen;
        if(string[i] == ' ')
           ++numBlank;
        ++i;
    }

    //替换后的长度
    int newLen = originalLen + numBlank*2;
    if(newLen > length)
        return;

    int indexLen = originalLen;
    int indexOfNew = newLen;
    while(indexLen>=0 && indexOfNew>indexLen)
    {   
        if(string[indexLen] == ' ')
        {   
            string[indexOfNew--]='0';
            string[indexOfNew--]='2';
            string[indexOfNew--]='%';
        }
        else
        {
            string[indexOfNew--] = string[indexLen];
        }
        --indexLen;
    }
}

int main()
{
    char buf[]={"hello world!"};
    ReplaceBlank(buf,20);
    printf("buf:%s\n",buf);
    return 0;
}

#include<stdio.h>
#include<stdlib.h>

typedef int data_t;
//栈结构
typedef struct LIFO
{
    int *data;  // 4字节的指针 指向数组（后分配的数组）
    int maxlen;    // 存储数据的个数最大值
    int top;
}seqstack_t;

//链表结构
typedef struct node{
    int data;
    struct node *next;
}linknode_t,* linklist_t;

//创建空的链表
linknode_t *CreateLink()
{
    linknode_t *H;
    H = (linklist_t)malloc(sizeof(linknode_t));
    H->next = NULL;
    return H;
}

//初始化一个空链表
void InitLink(linknode_t *H)
{
    linknode_t *r,*p;//r指向队尾
    r = H;
    int i=0;
    for(;i<5;i++)
    {
            p = (linklist_t)malloc(sizeof(linknode_t));
            p->data = i+1;
            p->next = NULL;
            r->next = p;
            r = p;//再将r指向队尾
    }
}

//打印所有节点
linknode_t * ShowLink(linknode_t *H,seqstack_t *T)
{
    linknode_t *p,*r;
    int temp=0;
    p = H->next;
    while(p != NULL)
    {
            T->data[T->top]=p->data;
            p = p->next;
            T->top++;
    }
    --T->top;    
    while(T->top>=0)
    {
            printf("data:%-5d",T->data[T->top]);
            T->top--;
    }
}

//清空链表
void ClearLink(linknode_t *H)
{
    linknode_t *p,*q;//p是删除的节点,q记录下一个要删除的节点
    q = H->next;
    while(q != NULL)
    {
            p = q;
            q = p->next;
            free(p);
    }
    printf("\n");
    H->next = NULL;
}

seqstack_t *  CreateStack(int max)
{
    seqstack_t *H;   // 分配结构体空间 --> 一个栈
    H = (seqstack_t *)malloc(sizeof(seqstack_t));     
    H->data = (data_t *)malloc(sizeof(data_t) * max);// 结构体成员赋值
    H->maxlen = max;
    H->top = 0;  
    return H;
}

int main()
{
    seqstack_t *T=CreateStack(10); // 获取一个空的栈
    linknode_t *H=CreateLink();
    InitLink(H);
    ShowLink(H,T);
    ClearLink(H);
    free(H);

    return 0;
}