第3周实践项目3 求集合并集

main.cpp

#include "list.h"
#include <stdio.h>
void unionList(SqList *LA, SqList *LB, SqList *&LC)
{
    int lena,i;
    ElemType e;
    InitList(LC);
    for (i=1; i<=ListLength(LA); i++) //将LA的所有元素插入到Lc中
    {
        GetElem(LA,i,e);
        ListInsert(LC,i,e);
    }
    lena=ListLength(LA);         //求线性表LA的长度
    for (i=1; i<=ListLength(LB); i++)
    {
        GetElem(LB,i,e);         //取LB中第i个数据元素赋给e
        if (!LocateElem(LA,e)) //LA中不存在和e相同者,插入到LC中
            ListInsert(LC,++lena,e);
    }
}
//用main写测试代码
int main()
{
    SqList *sq_a, *sq_b, *sq_c;
    ElemType a[6]= {5,8,7,2,4,9};
    CreateList(sq_a, a, 6);
    printf("LA: ");
    DispList(sq_a);

    ElemType b[6]= {2,3,8,6,0};
    CreateList(sq_b, b, 5);
    printf("LB: ");
    DispList(sq_b);
    unionList(sq_a, sq_b, sq_c);
    printf("LC: ");
    DispList(sq_c);
    return 0;
}

list.h

#ifndef LIST_H_INCLUDED
#define LIST_H_INCLUDED

#define MaxSize 50
typedef int ElemType;
typedef struct
{
    ElemType data[MaxSize];
    int length;
} SqList;
void CreateList(SqList *&L, ElemType a[], int n);//用数组创建线性表
void InitList(SqList *&L);//初始化线性表InitList(L)
void DestroyList(SqList *&L);//销毁线性表DestroyList(L)
bool ListEmpty(SqList *L);//判定是否为空表ListEmpty(L)
int ListLength(SqList *L);//求线性表的长度ListLength(L)
void DispList(SqList *L);//输出线性表DispList(L)
bool GetElem(SqList *L,int i,ElemType &e);//求某个数据元素值GetElem(L,i,e)
int LocateElem(SqList *L, ElemType e);//按元素值查找LocateElem(L,e)
bool ListInsert(SqList *&L,int i,ElemType e);//插入数据元素ListInsert(L,i,e)
bool ListDelete(SqList *&L,int i,ElemType &e);//删除数据元素ListDelete(L,i,e)#endif // LIST_H_INCLUDED
#endif

list.cpp

#include <stdio.h>
#include <malloc.h>
#include "list.h"
//用数组创建线性表
void CreateList(SqList *&L, ElemType a[], int n)
{
    int i;
    L=(SqList *)malloc(sizeof(SqList));//注意c语言的开辟动态内存的格式
    for (i=0; i<n; i++)
        L->data[i]=a[i];
    L->length=n;
}
//初始化线性表InitList(L)
void InitList(SqList *&L)   //引用型指针
{
    L=(SqList *)malloc(sizeof(SqList));
    //分配存放线性表的空间
    L->length=0;
}

//销毁线性表DestroyList(L)
void DestroyList(SqList *&L)
{
    free(L);//值得借鉴的
}

//判定是否为空表ListEmpty(L)
bool ListEmpty(SqList *L)
{
    return(L->length==0);//为空时返回1
}

//求线性表的长度ListLength(L)
int ListLength(SqList *L)
{
    return(L->length);
}

//输出线性表DispList(L)
void DispList(SqList *L)
{
    int i;
    if (ListEmpty(L))
        return;
    for (i=0; i<L->length; i++)
        printf("%d ",L->data[i]);
    printf("
");
}

//求某个数据元素值GetElem(L,i,e)
bool GetElem(SqList *L,int i,ElemType &e)//引用，e
{
    if (i<1 || i>L->length)  return false;
    e=L->data[i-1];
    return true;
}

//按元素值查找LocateElem(L,e)
int LocateElem(SqList *L, ElemType e)
{
    int i=0;
    while (i<L->length && L->data[i]!=e) i++;
    if (i>=L->length)  return 0;
    else  return i+1;
}

//插入数据元素ListInsert(L,i,e)
bool ListInsert(SqList *&L,int i,ElemType e)
{
    int j;
    if (i<1 || i>L->length+1)
        return false;   //参数错误时返回false
    i--;            //将顺序表逻辑序号转化为物理序号
    for (j=L->length; j>i; j--) //将data[i..n]元素后移一个位置
        L->data[j]=L->data[j-1];
    L->data[i]=e;           //插入元素e
    L->length++;            //顺序表长度增1
    return true;            //成功插入返回true
}

//删除数据元素ListDelete(L,i,e)
bool ListDelete(SqList *&L,int i,ElemType &e)
{
    int j;
    if (i<1 || i>L->length)  //参数错误时返回false
        return false;
    i--;        //将顺序表逻辑序号转化为物理序号
    e=L->data[i];
    for (j=i; j<L->length-1; j++) //将data[i..n-1]元素前移
        L->data[j]=L->data[j+1];
    L->length--;              //顺序表长度减1
    return true;              //成功删除返回true
}