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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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typedef struct //结构体
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{
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double no;
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char name[30];
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float cscore;
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}Student;
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FILE *fp;
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int i=0;
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Student s[50];
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void input(); /*输入记录*/
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void output(); /*输出记录*/
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void modify(); /*修改记录*/
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void lookat(); /*学生信息查询*/
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void section(); /*学生成绩分段*/
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void rank(); /*成绩的排序*/
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int fun(); /*目录函数*/
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void choose(int n); /*目录的选项*/
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int main(void) /*主函数*/
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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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int fun() //目录函数
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{
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int n;
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system("cls");
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printf("\n\n\t\t\t\t 成绩记录薄");
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printf("\n\n\t\t\t");
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for(int 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、学生成绩排名！ \t*\n");
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printf("\t\t\t* 7、退出成绩记录薄！ \t*\n");
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printf("\t\t\t ****设计者：杨兰仕 胡玉凤****\n");
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printf("\t\t\t");
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for(int 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() //成绩输入
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{
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Student s[50];
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system("cls");
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int i=0;
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FILE *fp;
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fp=fopen("a.txt","a");
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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("%lf",&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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if(s[i].no!=0)
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fprintf(fp,"%.0lf %-4s %.1f\n",s[i].no,s[i].name,s[i].cscore);
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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() //成绩输出
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{
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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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printf("\t\t\t全部的学生信息：\n");
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int k=0;
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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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printf("\t\t\t%.0lf\t%s\t%.1f\n",s[k].no,s[k].name,s[k].cscore);
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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() //成绩修改
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{
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char st[30];
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double x,num;
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float nu;
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int k=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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return;
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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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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("%lf",&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：");
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scanf("%lf",&num);
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for(int 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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fp=fopen("a.txt","w");
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for(i=0;i<k;i++)
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fprintf(fp,"%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
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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(int 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("请输入修改的成绩：\n");
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scanf("%f",&nu);
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s[i].cscore=nu;
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fp=fopen("a.txt","w");
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for(i=0;i<k;i++)
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fprintf(fp,"%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
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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() //成绩查询
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{
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char st[30];
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double x,num;
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int k=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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return;
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}
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while(fscanf(fp,"%lf%s%fd",&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("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("%lf",&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("%lf",&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("%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
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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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{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("%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
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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 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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