From e3407f2e3c3b51ba54a498ac551c7e087fdf1d80 Mon Sep 17 00:00:00 2001
From: "18408000523@stu.hut.edu.cn" <18408000523@stu.hut.edu.cn>
Date: Thu, 10 Jan 2019 20:03:23 +0800
Subject: [PATCH] second

---
 Untitled2.cpp | 251 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 251 insertions(+)
 create mode 100644 Untitled2.cpp

diff --git a/Untitled2.cpp b/Untitled2.cpp
new file mode 100644
index 0000000..2e510cd
--- /dev/null
+++ b/Untitled2.cpp
@@ -0,0 +1,251 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<string.h>
+int i,j,k,y;
+FILE *fp;
+struct stu {	
+	int num;
+	char name[30];
+	double cscore;
+};
+struct stu s[100];
+
+int fun() {	// 目录函数
+	int n;
+	system("cls");
+	printf("\n\n\t\t\t\t欢迎使用成绩记录薄  ");
+	printf("\n\n\t\t\t");
+	printf("************ 菜 单 *************\n");
+	printf("\t\t\t[1]创建学生信息\n");
+	printf("\t\t\t[2]输出所有学生信息\n");
+	printf("\t\t\t[3]修改学生成绩\n");
+	printf("\t\t\t[4]查询学生信息\n");
+	printf("\t\t\t[5]分段显示学生成绩\n");
+	printf("\t\t\t[6]查询学生平均分和及格率\n");
+	printf("\t\t\t[7]学生成绩排名\n");
+	printf("\t\t\t[8]在原文件基础上添加学生信息\n");
+	printf("\t\t\t[9]退出成绩记录薄\n");
+	printf("\t\t\t");
+	for(i=0; i<32; i++)
+		printf("-");
+	printf("\n\n");
+	printf("\n\t\t\t请输入选项：");
+	scanf("%d",&n);
+	return n;
+}
+
+void input() {
+	system("cls");
+	i=0;
+	fp=fopen("stuinfo","w");
+	printf("*结束请在学号、姓名、成绩栏输入 0*\n");
+	do {
+		printf("输入学生的学号：");
+		scanf("%d",&s[i].num);
+		printf("输入学生的姓名：");
+		scanf("%s",s[i].name);
+		printf("输入学生的 C 语言成绩：");
+		scanf("%lf",&s[i].cscore);
+		if(s[i].num!=0)
+			fprintf(fp,"%d%-4s%.1lf\n",s[i].num,s[i].name,s[i].cscore);
+	} while(s[i].num!=0);
+	fclose(fp);
+}
+
+void output() {
+	if((fp=fopen("stuinfo","r"))==NULL) {
+		printf("打不开文件！\n");
+	}
+	printf("\t\t\t	全部的学生信息：\n");
+	k=0;
+	while(fscanf(fp,"%d%s%lf",&s[k].num,s[k].name,&s[k].cscore)!=EOF) {
+		printf("\t\t\t%d\t%s\t%.1lf\n",s[k].num,s[k].name,s[k].cscore);
+		k++;
+	}
+	fclose(fp);
+}
+
+void add() {
+	system("cls");
+	i=0;
+	fp=fopen("stuinfo","a");
+	printf("*结束请在学号、姓名、成绩栏输入 0*\n");
+	do {
+		printf("输入学生的学号：");
+		scanf("%d",&s[i].num);
+		printf("输入学生的姓名：");
+		scanf("%s",s[i].name);
+		printf("输入学生的 C 语言成绩：");
+		scanf("%lf",&s[i].cscore);
+		if(s[i].num!=0)
+			fprintf(fp,"%d%-4s%.1lf\n",s[i].num,s[i].name,s[i].cscore);
+	} while(s[i].num!=0);
+	fclose(fp);
+}
+
+void modify() {	//修改
+	char st[30];
+	int x,num;
+	double nu;
+	long h;
+	k=0;
+	system("cls");
+	if((fp=fopen("stuinfo","r"))==NULL) {
+		printf("打不开文件！\n");
+		return;
+	}
+	while(fscanf(fp,"%d%s%lf",&s[k].num,s[k].name,&s[k].cscore)!=EOF) {
+		k++;
+	}
+	fclose(fp);
+	printf("[1]用学号查询\n[2]用姓名查询\n请选择：\n");
+	scanf("%d",&x);
+	if(x==1) {
+		printf("请输入学号：");
+		scanf("%d",&num);
+		for(i=0; i<k; i++)
+			if(num==s[i].num) {
+				printf("请输入修改的成绩：\n");
+				scanf("%lf",&nu);
+				s[i].cscore=nu;
+				fp=fopen("stuinfo","w");
+				for(i=0; i<k; i++)
+					fprintf(fp,"%d%-4s%.1lf\n",s[i].num,s[i].name,s[i].cscore);
+				fclose(fp);
+				printf(" 修改成功 \n");
+				return;
+			}
+		printf(" 没有找到该学生！\n");
+		return;
+	}
+	if(x==2) {
+		printf("请输入姓名：");
+		scanf("%s",st);
+		for(i=0; i<k; i++)
+			if(strcmp(s[i].name,st)==0) {
+				printf(" 请输入修改的成绩：\n");
+				scanf("%lf",&nu);
+				s[i].cscore=nu;
+				fp=fopen("stuinfo","w");
+				for(i=0; i<k; i++)
+					fprintf(fp,"%d%-4s%.1lf\n",s[i].num,s[i].name,s[i].cscore);
+				fclose(fp);
+				printf(" 修改成功 \n");
+				return;
+			}
+		printf(" 没有找到该学生！\n");
+		return;
+	}
+}
+
+void lookat() {	//查询
+	char st[30];
+	int x,num;
+	k=0;
+	system("cls");
+	if((fp=fopen("stuinfo","r"))==NULL) {
+		printf("打不开文件！\n");
+		return;
+	}
+	while(fscanf(fp,"%d%s%lf",&s[k].num,s[k].name,&s[k].cscore)!=EOF) {
+		k++;
+	}
+	printf("[1]用学号查询\n[2]用姓名查询\n请选择：\n");
+	scanf("%d",&x);
+	if(x==1) {
+		printf("请输入学号：");
+		scanf("%d",&num);
+		for(i=0; i<k; i++)
+			if(num==s[i].num) {
+				printf("%d  %s  %.1lf\n",s[i].num,s[i].name,s[i].cscore);
+				return;
+			}
+		printf("对不起，没有找到该学生\n");
+		return;
+	}
+	if(x==2) {
+		printf("请输入姓名：");
+		scanf("%s",st);
+		for(i=0; i<k; i++)
+			if(strcmp(s[i].name,st)==0) {
+				printf("%d  %s  %.1lf\n",s[i].num,s[i].name,s[i].cscore);
+				return;
+			}
+		printf("对不起，没有找到该学生\n");
+	}
+}
+
+void subsection() {	//分段
+	system("cls");
+	k=0;
+	if((fp=fopen("stuinfo","r"))==NULL) {
+		printf("打不开文件！\n");
+	}
+	while(fscanf(fp,"%d%s%lf",&s[k].num,s[k].name,&s[k].cscore)!=EOF) {
+		k++;
+	}
+	printf("\t\t90 分以上学生的信息\n");
+	for(i=0; i<k; i++)
+		if(s[i].cscore>=90)
+			printf("\t\t\t%d  %s  %.1lf\n",s[i].num,s[i].name,s[i].cscore);
+	printf("\n\n");
+	printf("\t\t80 到 89 分学生的信息\n");
+	for(i=0; i<k; i++)
+		if(s[i].cscore<90&&s[i].cscore>=80)
+			printf("\t\t\t%d  %s  %.1lf\n",s[i].num,s[i].name,s[i].cscore);
+	printf("\n\n");
+	printf("\t\t60 到 79 分学生的信息\n");
+	for(i=0; i<k; i++)
+		if(s[i].cscore>=60&&s[i].cscore<80)
+			printf("\t\t\t%d  %s  %.1lf\n",s[i].num,s[i].name,s[i].cscore);
+	printf("\n\n");
+	printf("\t\t60 分以下学生的信息\n");
+	for(i=0; i<k; i++)
+		if(s[i].cscore<60)
+			printf("\t\t\t%d  %s  %.1lf\n",s[i].num,s[i].name,s[i].cscore);
+	printf("\n\n");
+}
+void average() {	//平均分、及格率 
+	system("cls");
+	k=0;
+	double sum=0,average,jgl;
+	int a=0;
+	if((fp=fopen("stuinfo","r"))==NULL) {
+		printf("打不开文件！\n");
+	}
+	while(fscanf(fp,"%d%s%lf",&s[k].num,s[k].name,&s[k].cscore)!=EOF) {
+		k++;
+	}
+	for(i=0; i<k; i++){
+		sum+=s[i].cscore;
+		}
+	average=sum/k;
+	printf("平均分为：%.1lf\n",average);
+	for(i=0; i<k; i++)
+		if(s[i].cscore>=60){
+			a++;
+		}
+	jgl=((double)a/(double)k)*100;
+	printf("及格率为：%.1lf%%\n",jgl);
+}
+	
+void rank() {	//排序
+	struct stu t;
+	k=0;
+	system("cls");
+	if((fp=fopen("stuinfo","r"))==NULL) {
+		printf("打不开文件!\n");
+	}
+	while(fscanf(fp,"%d%s%lf",&s[k].num,s[k].name,&s[k].cscore)!=EOF) {
+		k++;
+	}
+	for(i=0; i<k; i++)
+		for(j=i+1; j<k+1; j++)
+			if(s[i].cscore<s[j].cscore) {
+				t=s[i];
+				s[i]=s[j];
+				s[j]=t;
+			}
+	for(i=0; i<k; i++)
+		printf("\t\t\t	第 %d 名  %d  %-4s  %.1lf\n",i+1,s[i].num,s[i].name,s[i].cscore);
+}