sy9_4.c

数据结构实验与学习指导

/* sy9_4.c */
#include <stdio.h>
#include <mem.h>
#include <string.h>
#include <conio.h>
#include <stdlib.h>
#define MAX 100
typedef struct{
  char dm[5];  /*产品代码*/
  char mc[11]; /*产品名称*/ 
  int dj;      /*单价*/
  int sl;      /*数量*/ 
  long je;     /*金额*/
}PRO;
PRO sell[MAX];
void ReadDat();
void WriteDat();
void SortDat()      /*采用冒泡排序方法进行排序*/
{int I,j;
 PRO xy;
 for(I=0;I<99;I++)
  for(j=I+1;j<100;j++)    if(strcmp(sell[I].dm,sell[j].dm)>0||strcmp(sell[I].dm,sell[j].dm)==0&&sell[I].je<sell[j].je)
       { xy=sell[I];sell[I]=sell[j];sell[j]=xy; }
}
void main()
 {  memset(sell,0,sizeof(sell));
    ReadDat();
    SortDat();
    WriteDat();
 }
void ReadDat()
{
 FILE *fp;
 char str[80],ch[11];
 int i;
 fp=fopen("IN.DAT","r");  /*打开in.data文件*/
 for(i=0;i<100;i++){
   fgets(str,80,fp);
   memcpy(sell[i].dm,str,4);
   memcpy(sell[i].mc,str+4,10);
   memcpy(ch,str+14,4);ch[4]=0;
   sell[i].dj=atoi(ch);
   memcpy(ch,str+18,5);ch[5]=0;
   sell[i].sl=atoi(ch);
   sell[i].je=(long)sell[i].dj*sell[i].sl;
  }
 fclose(fp); /*关闭in.data文件*/
}
void WriteDat()   /*将排序结果保存到OUT.DAT 文件中*/
{ FILE *fp;
 int i;
 fp=fopen("OUT.DAT","w");  
 for(i=0;i<100;i++){ 
 printf("%s %s %4d %5d %5d\n", sell[i].dm,sell[i].mc,sell[i].dj,sell[i].sl, sell[i].je);
 fprintf(fp,"%s %s %4d %5d %5d\n", sell[i].dm,sell[i].mc,sell[i].dj,sell[i].sl, sell[i].je);
 }
 fclose(fp);
}