不行,還有其他類型的題都有類似情況
#include<stdio.h>
#include<mem.h>
#include<string.h>
#include<conio.h>
#include<stdlib.h>
#define MAX 100
typedef struct
{
char dm[5];
char mc[11];
int dj;
int sl;
long je;
} PRO;
PRO sell[MAX];
void ReadDat();
void WriteDat();
void SortDat()
{
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) /*按产品代码从大到小进行排列*/
{
xy=sell[i];
sell[i]=sell[j];
sell[j]=xy;
}
else if (strcmp(sell[i].dm,sell[j].dm)==0)
/*若产品代码相同*/
if (sell[i].je<sell[j].je)
/*则按金额从大到小进行排列*/
{
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("IN34.DAT","r");
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);
}
void WriteDat()
{
FILE *fp;
int i;
fp=fopen("OUT34.DAT","w");
for(i=0;i<100;i++)
{
fprintf(fp,"%s
%s
%4d
%5d
%10ld\n",sell[i].dm,sell[i].mc,sell[i].dj,
sell[i].sl,sell[i].je);
}
fclose(fp);
}