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求高手看看急啊 [复制链接]

铭人

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C币: 13 枚
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发表于 2010-5-27 23:21:25 |显示全部楼层

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#include "stdio.h"
#include "stdlib.h"
struct student_type
{ char num[11];
char name[8];
char cla[20];
int score[3];
float ave; } stu[4],work,s;
void main()
{ void save();
void display();
void sort();
void ini();
int i,sum=0;
for(i=0;i<4;i++)
{ scanf("%s %s %s %d %d %d",stu.num,stu.name,stu.cla,&stu.score[0],&stu.score[1],&stu.score[2]);
sum=stu.score[0]+stu.score[1]+stu.score[2];
stu.ave=float(sum/3.0); }
save();
display();
sort();
ini(); }
void save()
{ FILE *fp;
int i;
if((fp=fopen("score","wb"))==NULL)
{ printf("This file can't open!\n");
return;}
for(i=0;i<4;i++)
if(fwrite(&stu,sizeof(student_type),1,fp)!=1)
{ printf("File open error!\n");
return;}
fclose(fp); }
void display()
{ FILE *fp;
int i,m,j,sum=0;
float average;
fp=fopen("score","rb");
printf("num name cla score1 score2 score3 ave\n");
printf("---------------------------------------------------------------\n");
for(i=0;i<4;i++)
{ fread(&stu,sizeof(student_type),1,fp);
printf("%-10s%-10s%-10s%8d%8d%8d %8.2f\n",stu.num,stu.name,stu.cla,stu.score[0],stu.score[1],
stu.score[2],stu.ave);
}
fread(&stu,sizeof(struct student_type),1,fp);
for(j=0;j<3;j++)
{ m=j;
for(i=0;i<4;)
{sum+=stu.score[m];
average=float(sum/4.0);
i++;}
sum=0;
printf("subject %d average is %.2f\n",m,average); }
fclose(fp); }
void sort()
{ FILE *fp1,*fp2;
int i,j;
if((fp1=fopen("score","rb"))==NULL)
{ printf("The file cannot open\n\n");
exit(0); }
if((fp2=fopen("sort","rb"))==NULL)
{ printf("The file write error\n");
exit(0); }
for(i=0;i<4;i++)
if(fread(&stu,sizeof(struct student_type),1,fp1)!=1)
{ printf("file write error\n");
exit(0); }
for(i=0;i<4;i++)
for(j=i+1;j<4;j++)
if(stu.ave<stu[j].ave)
{ work.ave=stu.ave; stu.ave=stu[j].ave; stu[j].ave=work.ave; }
fwrite(&stu,sizeof(struct student_type),1,fp2);
fclose(fp1);
fp2=fopen("sort","r+");
printf("sorted students' scores lists is as follows\n");
printf("-----------------------------------------------\n");
for(i=0;i<4;i++)
{ fread(&stu,sizeof(struct student_type),1,fp2);
printf("%-10s%-10s%-10s%8d%8d%8d%8.2f\n",stu.num,stu.name,stu.cla,stu.score[0],stu.score[1],stu.score[2],stu.ave);
fclose(fp2); }}
void ini()
{ FILE *fp;
int i,j,t;
printf("\nnum: ");
scanf("%s",s.num);
printf("\nname: ");
scanf("%s",s.name);
printf("\ncla: ");
scanf("%s",s.cla);
printf("score1,score2,score3: ");
scanf("%d%d%d",&s.score[0],&s.score[1],&s.score[2]);
s.ave=(float)((s.score[0]+s.score[1]+s.score[2])/3.0);
for(t=0;stu[t].ave>s.ave&&t<4;t++)
printf("\nnow\n");
if((fp=fopen("sort","wb"))==NULL)
{ printf("can't open file\n");
exit(0); }
for(i=0;i<t;i++)
{ fwrite(&stu,sizeof(struct student_type),1,fp);
printf("\n%-10s%-10s%-10s",stu.num,stu.name,stu.cla);
for(j=0;j<3;j++)
printf("%8d",stu.score[j]);
printf("%8.2f",stu.ave); }
fwrite(&s,sizeof(struct student_type),1,fp);
printf("\n%-10s%-10s%-10s%8d%8d%8d%8.2f",s.num,s.name,s.cla,s.score[0],s.score[1],s.score[2],s.ave);
for(i=t;i<4;i++)
{ fwrite(&stu,sizeof(struct student_type),1,fp);
printf("\n%-10s%-10s%-10s",stu.num,stu.name,stu.cla);
for(j=0;j<3;j++)
printf("\n%8d",stu.score[j]);
printf("\n%8.2f",stu.ave); }
printf("\n");
fclose(fp);
}

复制代码

执行结果是：01 li 0906 89 98 78
02 wang 0906 89 79 88
03 zhang 0906 80 90 89
04 qing 0907 78 89 90
num    name    cla          score1  score2  score3  ave
---------------------------------------------------------------
01       li       0906          89    98    78 88.33
02       wang    0906          89    79    88 85.33
03       zhang    0906          80    90    89 86.33
04       qing    0907          78    89    90 85.67
subject 0  average is 84.00
subject 1  average is 89.00
subject 2  average is 86.25
The file write error
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