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#include<stdio.h>
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#include<stdlib.h>
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#include<string.h>
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int i,j,k,y;
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FILE *fp;
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struct stu
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{
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int no;
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char name[30];
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float cscore;
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long a;
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};struct stu s[100];
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int fun()
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{
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int n,i;
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system("cls");
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printf("\n\n\t\t\t\t 成绩记录簿");
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printf("\n\n\t\t\t");
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for(i=0;i<33;i++)
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printf("*");
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printf("\n");
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printf("\t\t\t *********菜单********\n");
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printf("\t\t\t* 1、创建学生的信息！ \t*\n");
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printf("\t\t\t* 2、输出所有学生的信息！ \t*\n");
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printf("\t\t\t* 3、修改成绩！ \t*\n");
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printf("\t\t\t* 4、查询！ \t*\n");
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printf("\t\t\t* 5、显示成绩分段的学生信息！ \t*\n");
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printf("\t\t\t* 6、显示及格率、平均分、最高分和最低分！ \t*\n");
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printf("\t\t\t* 7、学生成绩排名！ \t*\n");
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printf("\t\t\t* 8、退出成绩记录簿！ \t*\n");
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printf("\t\t\t");
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for(i=0;i<33;i++)
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printf("*");
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printf("\n\n");
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printf("\n\t\t\t 请输入选项：");
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scanf("%d",&n);
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return n;
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}
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void input()
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{
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system("cls");
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i=0;
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fp=fopen("out.dat","w");
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printf("请以0作为输入学生学号信息的结束！\n");
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do
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{
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printf("输入学生的学号：");
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scanf("%d",&s[i].no);
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printf("输入学生的姓名：");
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scanf("%s",s[i].name);
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printf("输入学生的C语言成绩：");
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scanf("%f",&s[i].cscore);
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printf("输入添加成绩的时间：");
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scanf("%ld",&s[i].a);
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if(s[i].no!=0)
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fprintf(fp,"%d %-4s %.1f %ld\n",s[i].no,s[i].name,s[i].cscore,s[i].a);
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}while(s[i].no!=0);
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fclose(fp);
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}
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void output()
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{
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if((fp=fopen("out.dat","r"))==NULL)
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{
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printf("Cannot open the file!\n");
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}
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printf("\t\t\t全部的学生信息：\n");
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k=0;
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while(fscanf(fp,"%d%s%f%ld",&s[k].no,s[k].name,&s[k].cscore,&s[k].a)!=EOF)
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{
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printf("\t\t\t%d\t%s\t%.lf\t%ld\n",s[k].no,s[k].name,s[k].cscore,s[k].a);
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k++;
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}
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fclose(fp);
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}
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void modify()
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{
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char st[30];
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int x,num;
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float nu;
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long h;
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k=0;
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system("cls");
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if((fp=fopen("out.dat","r"))==NULL)
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{
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printf("Cannot open the file!\n");
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return;
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}
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while(fscanf(fp,"%d%s%f%ld",&s[k].no,s[k].name,&s[k].cscore,&s[k].a)!=EOF)
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{
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k++;
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}
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fclose(fp);
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printf("输入1表示用学号修改，输入2表示用姓名修改！请选择：\n");
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scanf("%d",&x);
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if(x==1)
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{
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printf("请输入修改成绩人的学号；");scanf("%d",&num);
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for(i=0;i<k;i++)
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if(num==s[i].no)
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{
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printf("请输入修改的成绩；\n");
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scanf("%f",&nu);
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s[i].cscore=nu;
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printf("请输入修改的时间；\n");
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scanf("%ld",&h);
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s[i].a=h;
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fp=fopen("out.dat","w");
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for(i=0;i<k;i++)
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fprintf(fp,"%d %s %.lf %ld\n",s[i].no,s[i].name,s[i].cscore,s[i].a);
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fclose(fp);
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printf("修改成功\n");
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return;
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}
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printf("没有找到该生的信息！\n");
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return;
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}
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if(x==2)
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{
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printf("请输入修改成绩人的姓名；");
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scanf("%s",st);
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for(i=0;i<k;i++)
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if(strcmp(s[i].name,st)==0)
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{
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printf("请输入修改成绩的时间；\n");
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scanf("%ld",&h);
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s[i].a=h;
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fp=fopen("out.dat","w");
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for(i=0;i<k;i++)
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fprintf(fp,"%d %s %.lf %ld\n",s[i].no,s[i].name,s[i].cscore,s[i].a);
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fclose(fp);
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printf("修改成功\n");
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return;
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}
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printf("没有找到该生的信息！\n");
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return;
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}
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}
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void lookat()
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{
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char st[30];
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int x,num;
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k=0;
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system("cls");
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if((fp=fopen("out.dat","r"))==NULL)
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{
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printf("Cannot open the file!\n");
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return;
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}
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while(fscanf(fp,"%d%s%f%ld",&s[k].no,s[k].name,&s[k].cscore,&s[k].a)!=EOF)
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{
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k++;
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}
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printf("输入1表示用学号查询，输入2表示用姓名查询！请选择：\n");
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scanf("%d",&x);
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if(x==1)
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{
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printf("请输入查询的学号：");
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scanf("%d",&num);
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for(i=0;i<k;i++)
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if(num==s[i].no)
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{
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printf("%d %s %.1f%ld\n",s[i].no,s[i].name,s[i].cscore,s[i].a);
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return;
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}
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printf("对不起，找不到该生！\n");
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return;
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}
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if(x==2)
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{
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printf("请输入查询的姓名：");
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scanf("%s",st);
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for(i=0;i<k;i++)
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if(strcmp(s[i].name,st)==0)
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{
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printf("%d % s %.1f %ld\n",s[i].no,s[i].name,s[i].cscore,s[i].a);
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return;
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}
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printf("对不起，找不到该生！\n");
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}
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}
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void subsection()
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{
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system("cls");
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k=0;
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if((fp=fopen("out.dat","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,"%d%s%f%ld",&s[k].no,s[k].name,&s[k].cscore,&s[k].a)!=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%d %s %.1f %ld\n",s[i].no,s[i].name,s[i].cscore,s[i].a);
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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%d %s %.1f %ld\n",s[i].no,s[i].name,s[i].cscore,s[i].a);
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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%d %s %.1f %ld\n",s[i].no,s[i].name,s[i].cscore,s[i].a);
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printf("\n\n");
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}
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void demonstrate()
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{
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int max,min,score;
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double avg=0;
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scanf("%d",&score);
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max=min=score;
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avg+=score;
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for(i=0; i<29; i++)
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{
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scanf("%d",&score);
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if(score>max) max=score;
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if(score<min) min=score;
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avg+=score;
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}
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avg=avg/30;
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printf("最高分max=%d,最低分min=%d,平均分avg=%lf\n",max,min,avg);
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}
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void rank()
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{
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struct stu t;
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k=0;
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system("cls");
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if((fp=fopen("out.dat","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,"%d%s%f%ld",&s[k].no,s[k].name,&s[k].cscore,&s[k].a)!=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(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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printf("\t\t\t 第%d名%d %-4s %.1f %ld\n",i+1,s[i].no,s[i].name,s[i].cscore,s[i].a);
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}
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void choose(int n)
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{
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system("cls");
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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表示返回，输入2表示退出!\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表示返回，输入2表示退出！\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表示返回，输入2表示退出！\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表示返回，输入2表示退出！\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:subsection();
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printf("\n\n\n\n\t\t\t是否返回？输入1表示返回，输入2表示退出！\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:demonstrate();
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printf("\n\n\n\n\t\t\t是否赶回？输入1表示返回，输入2表示退出！\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:rank();
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printf("\n\n\n\n\t\t\t是否赶回？输入1表示返回，输入2表示退出！\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 8: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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int main(void)
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{
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int n;
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system("cls");
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n=fun();
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choose(n);
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}
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