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327 lines
7.1 KiB
327 lines
7.1 KiB
#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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int num;
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char name[30];
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double cscore;
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};
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struct stu s[100];
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int fun() { // 目录函数
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int n;
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system("cls");
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printf("\n\n\t\t\t\t欢迎使用成绩记录薄 ");
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printf("\n\n\t\t\t");
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printf("************ 菜 单 *************\n");
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printf("\t\t\t[1]创建学生信息\n");
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printf("\t\t\t[2]输出所有学生信息\n");
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printf("\t\t\t[3]修改学生成绩\n");
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printf("\t\t\t[4]查询学生信息\n");
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printf("\t\t\t[5]分段显示学生成绩\n");
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printf("\t\t\t[6]查询学生平均分和及格率\n");
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printf("\t\t\t[7]学生成绩排名\n");
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printf("\t\t\t[8]在原文件基础上添加学生信息\n");
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printf("\t\t\t[9]退出成绩记录薄\n");
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printf("\t\t\t");
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for(i=0; i<32; 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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system("cls");
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i=0;
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fp=fopen("stuinfo","w");
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printf("*结束请在学号、姓名、成绩栏输入 0*\n");
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do {
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printf("输入学生的学号：");
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scanf("%d",&s[i].num);
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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("%lf",&s[i].cscore);
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if(s[i].num!=0)
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fprintf(fp,"%d%-4s%.1lf\n",s[i].num,s[i].name,s[i].cscore);
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} while(s[i].num!=0);
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fclose(fp);
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}
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void output() {
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if((fp=fopen("stuinfo","r"))==NULL) {
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printf("打不开文件！\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%lf",&s[k].num,s[k].name,&s[k].cscore)!=EOF) {
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printf("\t\t\t%d\t%s\t%.1lf\n",s[k].num,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 add() {
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system("cls");
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i=0;
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fp=fopen("stuinfo","a");
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printf("*结束请在学号、姓名、成绩栏输入 0*\n");
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do {
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printf("输入学生的学号：");
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scanf("%d",&s[i].num);
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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("%lf",&s[i].cscore);
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if(s[i].num!=0)
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fprintf(fp,"%d%-4s%.1lf\n",s[i].num,s[i].name,s[i].cscore);
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} while(s[i].num!=0);
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fclose(fp);
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}
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void modify() { //修改
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char st[30];
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int x,num;
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double 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("stuinfo","r"))==NULL) {
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printf("打不开文件！\n");
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return;
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}
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while(fscanf(fp,"%d%s%lf",&s[k].num,s[k].name,&s[k].cscore)!=EOF) {
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k++;
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}
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fclose(fp);
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printf("[1]用学号查询\n[2]用姓名查询\n请选择：\n");
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scanf("%d",&x);
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if(x==1) {
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printf("请输入学号：");
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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].num) {
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printf("请输入修改的成绩：\n");
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scanf("%lf",&nu);
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s[i].cscore=nu;
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fp=fopen("stuinfo","w");
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for(i=0; i<k; i++)
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fprintf(fp,"%d%-4s%.1lf\n",s[i].num,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(" 没有找到该学生！\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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printf(" 请输入修改的成绩：\n");
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scanf("%lf",&nu);
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s[i].cscore=nu;
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fp=fopen("stuinfo","w");
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for(i=0; i<k; i++)
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fprintf(fp,"%d%-4s%.1lf\n",s[i].num,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(" 没有找到该学生！\n");
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return;
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}
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}
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void lookat() { //查询
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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("stuinfo","r"))==NULL) {
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printf("打不开文件！\n");
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return;
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}
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while(fscanf(fp,"%d%s%lf",&s[k].num,s[k].name,&s[k].cscore)!=EOF) {
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k++;
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}
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printf("[1]用学号查询\n[2]用姓名查询\n请选择：\n");
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scanf("%d",&x);
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if(x==1) {
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printf("请输入学号：");
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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].num) {
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printf("%d %s %.1lf\n",s[i].num,s[i].name,s[i].cscore);
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return;
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}
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printf("对不起，没有找到该学生\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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printf("%d %s %.1lf\n",s[i].num,s[i].name,s[i].cscore);
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return;
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}
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printf("对不起，没有找到该学生\n");
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}
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}
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void subsection() { //分段
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system("cls");
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k=0;
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if((fp=fopen("stuinfo","r"))==NULL) {
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printf("打不开文件！\n");
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}
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while(fscanf(fp,"%d%s%lf",&s[k].num,s[k].name,&s[k].cscore)!=EOF) {
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k++;
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}
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printf("\t\t90 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 %.1lf\n",s[i].num,s[i].name,s[i].cscore);
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printf("\n\n");
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printf("\t\t80 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 %.1lf\n",s[i].num,s[i].name,s[i].cscore);
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printf("\n\n");
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printf("\t\t60 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 %.1lf\n",s[i].num,s[i].name,s[i].cscore);
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printf("\n\n");
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printf("\t\t60 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%d %s %.1lf\n",s[i].num,s[i].name,s[i].cscore);
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printf("\n\n");
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}
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void average() { //平均分、及格率
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system("cls");
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k=0;
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double sum=0,average,jgl;
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int a=0;
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if((fp=fopen("stuinfo","r"))==NULL) {
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printf("打不开文件！\n");
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}
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while(fscanf(fp,"%d%s%lf",&s[k].num,s[k].name,&s[k].cscore)!=EOF) {
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k++;
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}
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for(i=0; i<k; i++){
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sum+=s[i].cscore;
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}
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average=sum/k;
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printf("平均分为：%.1lf\n",average);
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for(i=0; i<k; i++)
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if(s[i].cscore>=60){
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a++;
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}
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jgl=((double)a/(double)k)*100;
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printf("及格率为：%.1lf%%\n",jgl);
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}
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void rank() { //排序
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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("stuinfo","r"))==NULL) {
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printf("打不开文件!\n");
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}
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while(fscanf(fp,"%d%s%lf",&s[k].num,s[k].name,&s[k].cscore)!=EOF) {
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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];
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s[i]=s[j];
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s[j]=t;
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}
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for(i=0; i<k; i++)
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printf("\t\t\t 第 %d 名 %d %-4s %.1lf\n",i+1,s[i].num,s[i].name,s[i].cscore);
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}
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void choose(int n) { //目录
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system("cls");
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switch(n) {
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case 1:
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input();
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printf("\n\n\n\n\t\t\t 是否返回？\n\t\t 输入 1 返回主菜单，输入 2 退出程序！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());
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break;
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case 2:
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output();
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printf("\n\n\n\n\t\t\t 是否返回？\n\t\t 输入 1 返回主菜单，输入 2 退出程序！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());
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break;
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case 3:
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modify();
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printf("\n\n\n\n\t\t\t 是否返回？\n\t\t 输入 1 返回主菜单，输入 2 退出程序！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());
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break;
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case 4:
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lookat();
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printf("\n\n\n\n\t\t\t 是否返回？\n\t\t 输入 1 返回主菜单，输入 2 退出程序！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());
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break;
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case 5:
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subsection();
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printf("\n\n\n\n\t\t\t 是否返回？\n\t\t 输入 1 返回主菜单，输入 2 退出程序！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());
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break;
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case 6:
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average();
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printf("\n\n\n\n\t\t\t 是否返回？\n\t\t 输入 1 返回主菜单，输入 2 退出程序！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());
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break;
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case 7:
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rank();
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printf("\n\n\n\n\t\t\t 是否返回？\n\t\t 输入 1 返回主菜单，输入 2 退出程序！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());
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break;
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case 8:
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add();
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printf("\n\n\n\n\t\t\t 是否返回？\n\t\t 输入 1 返回主菜单，输入 2 退出程序！\n");
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scanf("%d",&y);
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if(y==1)
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choose(fun());
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break;
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case 9:
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exit(0);
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break;
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default:
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printf("\n\n\t\t\t 您输入的选项不存在，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() { // 主函数
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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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