2.4.3 선택 정렬 알고리즘 소스 코드

//common.h
#pragma once //헤더 파일을 한 번만 포함해서 컴파일
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <string.h>
#include <malloc.h>
#include <memory.h>
#include <time.h>

#pragma warning(disable:4996) //4996컴파일 경고 메시지 출력 해제

//Book.h
#pragma once
#include "common.h"
#define MAX_TIT_LEN     200
#define MAX_AUT_LEN 20
typedef struct _Book Book;

struct _Book
{
    char title[MAX_TIT_LEN+1];
    char author[MAX_AUT_LEN+1];
    int num;
};

Book *New_Book(const char *title,const char *author,int num);
void Delete_Book(Book *book);
void Book_View(Book *book);
int Book_CompareTitle(Book *book,const char *title);
int Book_CompareAuthor(Book *book,const char *author);
int Book_CompareNum(Book *book,int num);

//Book.c
#include "Book.h"
void Book_Book(Book *book,const char *title,const char *author,int num);

Book *New_Book(const char *title,const char *author,int num)
{
    Book *book = 0;
    book = (Book *)malloc(sizeof(Book));
    Book_Book(book,title,author,num);
    return book;
}

void Book_Book(Book *book,const char *title,const char *author,int num)
{
    memset(book,0,sizeof(Book));
    strncpy(book->title,title,MAX_TIT_LEN);
    strncpy(book->author,author,MAX_AUT_LEN);
    book->num = num;
}

void Delete_Book(Book *book)
{
    free(book);
}

void Book_View(Book *book)
{
    printf("<%010d>:<%s>\n",book->num,book->title);
    printf("\t 저자:%s\n",book->author);
}

int Book_CompareTitle(Book *book,const char *title)
{
    return strcmp(book->title,title);
}

int Book_CompareAuthor(Book *book,const char *author)
{
    return strcmp(book->author,author);
}

int Book_CompareNum(Book *book,int num)
{
    return book->num-num;
}

//Program.c
#include "common.h"
#include "Book.h"
typedef void *Element;
typedef int (*Compare)(Element , Element);


void select_sort(Element *base, int n, Compare compare)//선택 정렬(base:배열의 시작 주소, n: 원소 개수, compare:비교 논리)
{
    int i = 0, j=0;
    int max=0;
    Element temp;
    for(i=n; i>1; i--)//    반복(i:=컬렉션의 자료 개수;  i>1  ; i:= i-1)
    {
        for(max=0, j=1; j<i; j++)//반복(max=0,j:=1; j<i ; j:=j+1)
        {
            if(compare(base[max],base[j])<0)//조건(icomparer(collection[max], collection[j]) < 0)
            {
                max = j;//max := j
            }
        }
        temp = base[i-1];//temp: = collection[i-1]
        base[i-1] = base[max];//collection[i-1] = collection[max]
        base[max] = temp;//collection[max] = temp
    }
}

#define MAX_BOOK 10000
Book *books[MAX_BOOK]={0};

void SimulationInit()
{
    char title[MAX_TIT_LEN+1]="";
    char author[MAX_AUT_LEN+1]="";
    int i = 0;
    for(i=0; i<MAX_BOOK; ++i)
    {
        sprintf(title,"%010d",rand());
        sprintf(author,"%010d",rand());
        books[i] = New_Book(title,author,rand());
    }
}
int CompareByTitle(void *b1,void *b2)
{
    Book *book1=(Book *)b1;
    Book *book2=(Book *)b2;
    return Book_CompareTitle(book1,book2->title);
}
int CompareByNum(void *b1,void *b2)
{
    Book *book1=(Book *)b1;
    Book *book2=(Book *)b2;
    return Book_CompareNum(book1,book2->num);
}
void ListBook(int n)
{
    int i = 0;
    for(i=0; i<n; ++i)
    {
        Book_View(books[i]);
    }
}

void Simulation1()
{
    select_sort(books,10,CompareByTitle);
    printf("--------제목순-------\n");
    ListBook(10);
    select_sort(books,10,CompareByNum);
    printf("--------번호순-------\n");
    ListBook(10);
}
void Simulation2()
{
    clock_t st,et;
    st = clock();
    select_sort(books,MAX_BOOK/10,CompareByTitle);
    et=clock();
    printf("%d개 정렬에 걸린 시간:%d\n",MAX_BOOK/10,et-st);
    st = clock();
    select_sort(books,MAX_BOOK,CompareByTitle);
    et=clock();
    printf("%d개 정렬에 걸린 시간:%d\n",MAX_BOOK,et-st);
}
void SimulationClear()
{
    int i = 0;
    for(i=0; i<MAX_BOOK; ++i)
    {
        Delete_Book(books[i]);
    }
}
int main()
{
    SimulationInit();
    Simulation1(); //제대로 동작하는지 확인
    Simulation2(); //수행 속도 확인
    SimulationClear();
    return 0;
}