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 // 001.cpp : 定义控制台应用程序的入口点。
//

/************************************************************************/
/* 将存放的worker.rec职工数据按照工资高低进行排序写到文件中      */
/************************************************************************/

 

#include "stdafx.h"

#define N 10

typedef struct workData{
 int num;
 char name[30];
 char sex[5];
 int age;
 float salary;

}Employee;

 

//read data
void readWordData(Employee* employee, int fileType)
{
 if ( !employee ) return;
 FILE *fp;
 Employee temp = {0};

 if ( 1 == fileType )
 {
  fopen_s(&fp, "workdata.rec", "rb");
 }
 else if( 2 == fileType )
 {
  fopen_s(&fp, "workdata2.rec", "rb");
 }
 
 
 if ( fp )
 {
  fread(&temp, sizeof(temp), 1, fp);
  while ( !feof(fp) )
  {
   *employee++ = temp;
   fread(&temp, sizeof(temp), 1, fp);
  }
 }

 

 fclose(fp);

}

void writeWordData(Employee* employee, int size)
{
 if ( !employee ) return;
 FILE *fp;
 fopen_s(&fp, "workdata2.rec", "wb");
 if ( fp )
 {
  fwrite(employee, size, 1, fp);
  fflush(fp);
  fclose(fp);
 }
}

//sort
void sortEmployeeBySalary(Employee* employee, int length)
{
 //45.25  20.25  23.21  1.56  56.98

 //56.98 45.25 20.25  23.21  1.56

#if 1 
 Employee temp = {0};
 for(int i = 0;i < length;++i)
 {
  for(int j = i+1; j < length;++j)
  {
   if ( employee[j].salary > employee[i].salary )
   {
    temp = employee[i];
    employee[i] = employee[j];
    employee[j] = temp;
   }
  }
 }
#endif
#if 0
 Employee temp = {0};
 bool bChange = false;
 
 for(int i = length -1;i >= 0;--i)
 {
  for(int j = 0;j < i;++j)
  {
   if ( employee[j].salary < employee[j+1].salary )
   {
    temp = employee[j];
    employee[j] = employee[j+1];
    employee[j+1] = temp;
    bChange = true;
   }
   
  }

  if ( !bChange )
  {
   
   break;
  }
   
 }
#endif
}

void display(Employee* employee, int length, int printfType)
{
 if ( !employee ) return;

 if ( 1 == printfType )
 {
  printf("未按高工资排序：\n");
 }
 else if( 2 == printfType )
 {
  printf("按高工资排序后：\n");
 }
 
 for(int i = 0;i < length; ++i)
 {
  printf("%d  %s  %s  %d  %f\n", employee[i].num,  employee[i].name, employee[i].sex, employee[i].age, employee[i].salary);
 }

 printf("\r\n");
}

int _tmain(int argc, _TCHAR* argv[])
{
 Employee employee[N] = {0};
 readWordData(employee, 1);
 
 display(employee, N, 1);
 

 sortEmployeeBySalary(employee, sizeof(employee)/sizeof(Employee));
 
 writeWordData(employee, sizeof(employee)/sizeof(Employee));
 
 readWordData(employee, 2);

 display(employee, N, 2);

 return 0;
}

 

#if 0
void initData()
{
 Employee employee[] =
 {
  { 1,"a1", "男", 23, 5678.67},
  { 2,"a2", "男", 24, 1678.67},
  { 3,"a6", "男", 23, 3678.67},
  { 4,"a1", "女", 26, 8678.67},
  { 5,"b1", "男", 23, 9678.67},
  { 6,"c1", "男", 29, 2678.67},
  { 7,"d1", "女", 35, 12678.67},
  { 8,"d1", "男", 23, 2678.67}

 };

 FILE* fp;
 fopen_s(&fp, "workdata.rec", "wb");

 if ( fp )
 {
  fwrite(employee,sizeof(employee), 1, fp);
  printf("success!");
  fclose(fp);
 }

}
#endif