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#include"c1.cpp"
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void section() //学生成绩分段
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{
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system("cls");
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int k=0;
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double c;
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if((fp=fopen("a.txt","r"))==NULL)
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{
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printf("Cannot open the file!\n");
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}
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while(fscanf(fp,"%lf%s%f",&s[k].no,s[k].name,&s[k].cscore)!=EOF)
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{
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k++;
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}
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printf("\t\t\t 90分以上学生的信息!\n");
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for(i=0;i<k;i++)
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if(s[i].cscore>=90)
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printf("\t\t\t%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
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printf("\n\n");
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printf("\t\t\t 80到89分学生的信息!\n");
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for(i=0;i<k;i++)
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if(s[i].cscore<90&&s[i].cscore>=80)
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printf("\t\t\t%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
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printf("\n\n");
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printf("\t\t\t 60到79分学生的信息!\n");
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for(i=0;i<k;i++)
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if(s[i].cscore>=60&&s[i].cscore<80)
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printf("\t\t\t%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
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printf("\n\n");
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printf("\t\t\t 60分以下学生的信息!\n");
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for(i=0;i<k;i++)
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if(s[i].cscore<60)
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printf("\t\t\t%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
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printf("\n\n");
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}
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void rank() //成绩的排序
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{
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Student t;
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int k=0;
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double sum=0,j=0;
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system("cls");
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if((fp=fopen("a.txt","r"))==NULL)
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{
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printf("Cannot open the file!\n");
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}
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while(fscanf(fp,"%lf%s%f",&s[k].no,s[k].name,&s[k].cscore)!=EOF)
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{
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k++;
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}
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for(i=0;i<k;i++)
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for(int j=i+1;j<k+1;j++)
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if(s[i].cscore<s[j].cscore)
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{t=s[i];s[i]=s[j];s[j]=t;}
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for(i=0;i<k;i++)
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{
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if(s[i].cscore>=60)
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j++;
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}
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for(i=0;i<k;i++)
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sum=sum+s[i].cscore;
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for(i=0;i<k;i++)
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printf("\t\t\t第%d名:%.0lf %-4s %.1f\n",i+1,s[i].no,s[i].name,s[i].cscore);
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printf("\t\t\t最高分:%.1lf\n",s[0].cscore);
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printf("\t\t\t最低分:%.1lf\n",s[k-1].cscore);
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printf("\t\t\t及格率:%.2lf\n",j/k);
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printf("\t\t\t平均分:%.2lf\n",sum/k);
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}
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void choose(int n) //目录的选项
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{
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system("cls");
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int y;
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switch(n)
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{
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case 1:input();
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printf("\n\n\n\n\t\t\t是否返回？输入1表返回，输入2表退出！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());break;
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case 2:output();
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printf("\n\n\n\n\t\t\t是否返回？输入1表返回，输入2表退出！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());break;
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case 3:modify();
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printf("\n\n\n\n\t\t\t是否返回？输入1表返回，输入2表退出！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());break;
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case 4:lookat();
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printf("\n\n\n\n\t\t\t是否返回？输入1表返回，输入2表退出！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());break;
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case 5:section();
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printf("\n\n\n\n\t\t\t是否返回？输入1表返回，输入2表退出！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());break;
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case 6:rank();
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printf("\n\n\n\n\t\t\t是否返回？输入1表返回，输入2表退出！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());break;
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case 7:exit(0);break;
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default:printf("\n\n\t\t\t 输入没有的选项，请重新输入！\n");
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choose(fun());
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}
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}
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