diff --git a/c1.c b/c1.c
new file mode 100644
index 0000000..6fc9b42
--- /dev/null
+++ b/c1.c
@@ -0,0 +1,37 @@
+void input()				//³É¼¨ÊäÈë 
+{
+	Student s[50];
+	system("cls");
+	int i=0;
+	FILE *fp;
+	fp=fopen("a.txt","a+");
+	printf("ÇëÒÔ0×÷ΪÊäÈëѧÉúѧºÅÐÅÏ¢µÄ½áÊø£¡\n");
+		do
+		{ 
+			printf("ÊäÈëѧÉúµÄѧºÅ£º");
+			scanf("%lf",&s[i].no);
+			printf("ÊäÈëѧÉúµÄÐÕÃû£º");
+			scanf("%s",s[i].name);
+			printf("ÊäÈëѧÉúµÄCÓïÑԳɼ¨£º");
+			scanf("%f",&s[i].cscore);
+			if(s[i].no!=0)
+				fprintf(fp,"%.0lf  %-4s  %.1f\n",s[i].no,s[i].name,s[i].cscore);
+		}while(s[i].no!=0);
+		fclose(fp);
+}
+void output()						//³É¼¨Êä³ö 
+{
+	if((fp=fopen("a.txt","r"))==NULL)
+	{
+    printf("Cannot open the file!\n");
+
+	}
+    printf("\t\t\tÈ«²¿µÄѧÉúÐÅÏ¢£º\n");
+    int k=0;
+	while(fscanf(fp,"%lf%s%f",&s[k].no,s[k].name,&s[k].cscore)!=EOF) 
+	{
+	printf("\t\t\t%.0lf\t%s\t%.1f\n",s[k].no,s[k].name,s[k].cscore);
+	k++;
+	}
+	fclose(fp);	
+}
diff --git a/c2.c b/c2.c
new file mode 100644
index 0000000..05f319d
--- /dev/null
+++ b/c2.c
@@ -0,0 +1,107 @@
+void modify()					//³É¼¨ÐÞ¸Ä 
+{
+	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("ÊäÈë1±íʾÓÃѧºÅÐ޸ģ¬ÊäÈë2±íʾÓÃÐÕÃûÐ޸ģ¡ÇëÑ¡Ôñ£º\n");
+	scanf("%lf",&x);
+	if(x==1)
+	{
+		printf("ÇëÊäÈëÐ޸ijɼ¨È˵ÄѧºÅ£º");
+		scanf("%lf",&num);
+		int i;
+		for(i=0;i<k;i++)
+		if(num==s[i].no)
+		{
+			printf("ÇëÊäÈëÐ޸ĵijɼ¨£º\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("Ð޸ijɹ¦\n");
+			return;
+		}
+		printf("ûÓÐÕÒµ½¸ÃÉúµÄÐÅÏ¢£¡\n");
+		return;
+	}
+		if(x==2)
+		{	
+			printf("ÇëÊäÈëÐ޸ijɼ¨È˵ÄÐÕÃû£º");
+		scanf("%s",st);
+		int i;
+		for(i=0;i<k;i++)
+		if(strcmp(s[i].name,st)==0)
+			{
+				printf("ÇëÊäÈëÐ޸ĵijɼ¨£º\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("Ð޸ijɹ¦\n");
+				return;
+			}	
+		printf("ûÓÐÕÒµ½¸ÃÉúµÄÐÅÏ¢£¡\n");
+		return;
+		}
+		} 
+void lookat() 					//³É¼¨²éѯ 
+{
+	char st[30];
+	double x,num;
+	int k=0;
+	system("cls");
+	if((fp=fopen("a.txt","r"))==NULL)
+	{
+	printf("Cannot open the file!\n");
+	return;
+	}
+	while(fscanf(fp,"%lf%s%fd",&s[k].no,s[k].name,&s[k].cscore)!=EOF)
+	{
+	k++;
+	}
+	printf("ÊäÈë1±íʾÓÃѧºÅ²éѯ£¬ÊäÈë2±íʾÓÃÐÕÃû²éѯ£¡ÇëÑ¡Ôñ£º\n");
+	scanf("%lf",&x);
+	if(x==1)
+	{
+		printf("ÇëÊäÈë²éѯµÄѧºÅ£º");
+		scanf("%lf",&num);
+		for(i=0;i<k;i++)
+		if(num==s[i].no)
+		{
+			printf("%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
+			return;		
+
+		}
+		printf("¶Ô²»Æð£¬ÕÒ²»µ½¸ÃÉú£¡\n");
+		return;
+
+	}
+		if(x==2)
+		{printf("ÇëÊäÈë²éѯµÄÐÕÃû£º");
+		scanf("%s",st);
+		for(i=0;i<k;i++)
+		if(strcmp(s[i].name,st)==0)
+		{
+			printf("%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
+			return;
+		}
+		printf("¶Ô²»Æð£¬ÕÒ²»µ½¸ÃÉú£¡\n");
+		}
+}
diff --git a/c3.c b/c3.c
new file mode 100644
index 0000000..92f29e6
--- /dev/null
+++ b/c3.c
@@ -0,0 +1,70 @@
+void section()                //ѧÉú³É¼¨·Ö¶Î
+{
+	system("cls");
+	int k=0;
+	double c;
+	if((fp=fopen("a.txt","r"))==NULL)
+	{
+	printf("Cannot open the file!\n");
+
+	}
+	while(fscanf(fp,"%lf%s%f",&s[k].no,s[k].name,&s[k].cscore)!=EOF)
+	{
+	k++;
+	}
+	printf("\t\t\t  90·ÖÒÔÉÏѧÉúµÄÐÅÏ¢!\n");
+	for(i=0;i<k;i++)
+		if(s[i].cscore>=90)
+			printf("\t\t\t%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
+			printf("\n\n");
+	printf("\t\t\t  80µ½89·ÖѧÉúµÄÐÅÏ¢!\n");
+	for(i=0;i<k;i++)
+		if(s[i].cscore<90&&s[i].cscore>=80)
+			printf("\t\t\t%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
+			printf("\n\n");
+	printf("\t\t\t  60µ½79·ÖѧÉúµÄÐÅÏ¢!\n");
+	for(i=0;i<k;i++)
+		if(s[i].cscore>=60&&s[i].cscore<80)
+			printf("\t\t\t%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
+			printf("\n\n");
+	printf("\t\t\t  60·ÖÒÔÏÂѧÉúµÄÐÅÏ¢!\n");
+	for(i=0;i<k;i++)
+		if(s[i].cscore<60)
+		printf("\t\t\t%.0lf %s %.1f\n",s[i].no,s[i].name,s[i].cscore);
+		printf("\n\n");
+} 
+void rank()                       //³É¼¨µÄÅÅÐò
+{
+	Student t;
+	int k=0;
+    int sum=0,j=0;
+	system("cls");
+	if((fp=fopen("a.txt","r"))==NULL)
+	{
+ 	printf("Cannot open the file!\n");
+
+	}
+	while(fscanf(fp,"%lf%s%f",&s[k].no,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++)
+			{
+	  		if(s[i].cscore>=60)
+	  		j++;
+	  		}
+			for(i=0;i<k;i++)
+			sum=sum+s[i].cscore;
+			for(i=0;i<k;i++)
+			printf("\t\t\tµÚ%dÃû:%.0lf  %-4s %.1f\n",i+1,s[i].no,s[i].name,s[i].cscore);
+			printf("\t\t\t×î¸ß·Ö:%.1lf\n",s[0].cscore);
+			printf("\t\t\t×îµÍ·Ö:%.1lf\n",s[k-1].cscore);
+			printf("\t\t\t¼°¸ñÂÊ:%.2lf\n",j/k);
+			printf("\t\t\tƽ¾ù·Ö:%.2lf\n",sum/k);
+}
+
+
diff --git a/头文件.exe b/头文件.exe
index e1fa637..c688efa 100644
Binary files a/头文件.exe and b/头文件.exe differ