From cfd86b1b6d6325d3311fc57bdbe830320149dad6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E2=80=9D=E6=9C=B1=E9=B9=8F=E4=BF=8A=E4=BF=8A?=
 <1106548749@qq.com>
Date: Thu, 10 Jan 2019 20:29:22 +0800
Subject: [PATCH] first commit

---
 c4.cpp | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 c4.cpp

diff --git a/c4.cpp b/c4.cpp
new file mode 100644
index 0000000..da6a09c
--- /dev/null
+++ b/c4.cpp
@@ -0,0 +1,62 @@
+#include"c3.cpp"
+void modify()					//成绩修改 
+{
+	char st[30];
+	double x,num;
+	float nu;
+	int k=0;
+	system("cls");
+	if((fp=fopen("a.txt","r"))==NULL)
+	{
+	printf("Cannot open the file!\n");
+	return;
+	}
+	while(fscanf(fp,"%lf%s%f",&s[k].no,s[k].name,&s[k].cscore)!=EOF)
+	{
+	k++;
+	}
+	fclose(fp);
+
+	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");
+	scanf("%lf",&x);
+	if(x==1)
+	{
+		printf("请输入修改成绩人的学号：");
+		scanf("%lf",&num);
+		for(int i=0;i<k;i++)
+		if(num==s[i].no)
+		{
+			printf("请输入修改的成绩：\n");
+			scanf("%f",&nu);
+			s[i].cscore=nu;
+			fp=fopen("a.txt","w");
+			for(i=0;i<k;i++)	
+			fprintf(fp,"%.0lf  %s  %.1f\n",s[i].no,s[i].name,s[i].cscore);
+			fclose(fp);
+			printf("修改成功\n");
+			return;
+		}
+		printf("没有找到该生的信息！\n");
+		return;
+	}
+		if(x==2)
+		{	
+			printf("请输入修改成绩人的姓名：");
+		scanf("%s",st);
+		for(int i=0;i<k;i++)
+		if(strcmp(s[i].name,st)==0)
+			{
+				printf("请输入修改的成绩：\n");
+				scanf("%f",&nu);
+				s[i].cscore=nu;
+				fp=fopen("a.txt","w");
+				for(i=0;i<k;i++)
+				fprintf(fp,"%.0lf  %s  %.1f\n",s[i].no,s[i].name,s[i].cscore);
+				fclose(fp);
+				printf("修改成功\n");
+				return;
+			}	
+		printf("没有找到该生的信息！\n");
+		return;
+		}
+		}