diff --git a/text.c b/text.c
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+++ b/text.c
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+#include  <stdio.h>
+#include  <stdlib.h>
+#include  <string.h>
+#define   MAX_LEN  10                    	// 字符串最大长度 
+#define   STU_NUM 30                       // 最多的学生人数 
+#define   COURSE_NUM 6                     // 最多的考试科目数 
+typedef struct student
+{
+	long num;						// 每个学生的学号 
+	char name[MAX_LEN];            	// 每个学生的姓名 
+	float score[COURSE_NUM];		// 每个学生COURSE_NUM门功课的成绩 
+	float sum;                   	     // 每个学生的总成绩 
+	float aver;               	     // 每个学生的平均成绩 
+}STU;
+int   Menu(void);
+void  ReadScore(STU stu[], int n, int m);
+void  AverSumofEveryStudent(STU stu[], int n, int m);
+void  AverSumofEveryCourse(STU stu[], int n, int m);
+void  SortbyScore(STU stu[],int n,int m,int (*compare)(float a,float b));
+int   Ascending(float a, float b);
+int   Descending(float a, float b);
+void  SwapFloat(float *x, float *y);
+void  SwapLong(long *x, long *y);
+void  SwapChar(char x[], char y[]);
+void  AsSortbyNum(STU stu[], int n, int m);
+void  SortbyName(STU stu[], int n, int m);
+void  SearchbyNum(STU stu[], int n, int m);
+void  SearchbyName(STU stu[], int n, int m);
+void  StatisticAnalysis(STU stu[], int n, int m);
+void  PrintScore(STU stu[], int n, int m);
+void  WritetoFile(STU record[], int n, int m);
+void  ReadfromFile(STU record[], int *n, int *m);
+int main(void)
+{
+	char  ch;
+	int   n = 0, m = 0;
+	STU   stu[STU_NUM];	
+printf("Input student number(n<%d):", STU_NUM);
+	scanf("%d", &n);
+printf("Input course number(m<=%d):",COURSE_NUM);
+	scanf("%d", &m);
+	while (1)
+	{
+		ch = Menu();				    // 显示菜单，并读取用户输入 		
+		switch (ch)
+		{
+			case 1:ReadScore(stu, n, m);
+					break;
+			case 2: AverSumofEveryCourse(stu, n, m);                        
+					break;
+            case 3: AverSumofEveryStudent(stu, n, m);                    
+					break;
+			case 4: SortbyScore(stu, n, m, Descending);
+					printf("\nSort in descending order by score:\n");
+					PrintScore(stu, n, m);
+					break;
+			case 5: SortbyScore(stu, n, m, Ascending);
+					printf("\nSort in ascending order by score:\n");
+					PrintScore(stu, n, m);
+					break;
+			case 6: AsSortbyNum(stu, n, m);
+					printf("\nSort in ascending order by number:\n");
+					PrintScore(stu, n, m);
+					break;
+			case 7: SortbyName(stu, n, m);
+					printf("\nSort in dictionary order by name:\n");
+					PrintScore(stu, n, m);
+					break;
+			case 8: SearchbyNum(stu, n, m);
+					break;
+			case 9: SearchbyName(stu, n, m);
+					break;
+			case 10: StatisticAnalysis(stu, n, m);
+					break;
+			case 11:PrintScore(stu, n, m);
+					break;
+case 12:WritetoFile(stu, n, m);
+				     break;
+			case 13:ReadfromFile(stu, &n, &m);
+				     break;
+			case 0: printf("End of program!");
+			       	exit(0);
+			default:printf("Input error!");
+		}
+	}
+	return 0;}
+//  函数功能：显示菜单并获得用户键盘输入的选项 
+int Menu(void)
+{
+		int itemSelected;
+		printf("Management for Students' scores\n");
+		printf("1.Input record\n");
+		printf("2.Calculate total and average score of every course\n");
+		printf("3.Calculate total and average score of every student\n");
+		printf("4.Sort in descending order by score\n");
+		printf("5.Sort in ascending order by score\n");
+		printf("6.Sort in ascending order by number\n");
+		printf("7.Sort in dictionary order by name\n");
+		printf("8.Search by number\n");
+		printf("9.Search by name\n");
+		printf("10.Statistic analysis\n");
+		printf("11.List record\n");
+		printf("12.Write to a file\n");
+		printf("13.Read from a file\n");
+		printf("0.Exit\n");
+		printf("Please Input your choice:");
+		scanf("%d", &itemSelected); 	// 读入用户输入 
+		return itemSelected;
+}
+// 函数功能：输入n个学生的m门课成绩 
+void ReadScore(STU stu[], int n, int m)
+{
+	int i, j;
+	printf("Input student's ID, name and score:\n");
+    /* ---------- begain ---------- */
+    for(i=0;i<n;i++)
+    {scanf("%ld%s",&stu[i].num,stu[i].name);
+     for (j=0; j<m; j++)
+     scanf("%f",&stu[i].score[j]);
+    }
+
+    /* ----------- end ----------- */
+}
+// 函数功能：计算每个学生各门课程的总分和平均分 
+void AverSumofEveryStudent(STU stu[], int n, int m)
+{
+	int i, j;
+	for (i=0; i<n; i++)
+	{
+	    stu[i].sum = 0;
+	    for (j=0; j<m; j++)
+	    {
+            stu[i].sum = stu[i].sum + stu[i].score[j];
+	    }
+	    stu[i].aver = m>0 ? stu[i].sum / m : -1;
+	    printf("student %d: sum = %.0f, aver = %.0f\n", 
+i+1, stu[i].sum, stu[i].aver);
+	}	
+}
+// 函数功能：计算每门课程的总分和平均分 
+void  AverSumofEveryCourse(STU stu[], int n, int m)
+{
+	int i, j;
+    float sum[COURSE_NUM], aver[COURSE_NUM];
+    /* ---------- begain ---------- */
+	for (j=0; j<m; j++)
+	{
+	    sum[j] = 0;
+	    for (i=0; i<n; i++)
+	    {
+            sum[j] +=  stu[i].score[j];
+	    }
+        aver[j]=sum[j]/i;
+        printf("student %d: sum = %.0f, aver = %.0f\n", 
+j+1, sum[j], aver[j]); 
+    }
+    /* ----------- end ----------- */
+}
+// 函数功能：按选择法将数组sum的元素值排序 
+void SortbyScore(STU stu[],int n,int m,int (*compare)(float a,float b))
+{
+	int  i, j, k, t;
+	for (i=0; i<n-1; i++)
+	{
+		k = i;
+		for (j=i+1; j<n; j++)
+		{
+			if ((*compare)(stu[j].sum, stu[k].sum)) k = j;
+		}
+		if (k != i)
+		{		   
+		   for (t=0; t<m; t++)             // 交换m门课程的成绩 
+            {
+                SwapFloat(&stu[k].score[t], &stu[i].score[t]);
+            }
+SwapFloat(&stu[k].sum, &stu[i].sum);    // 交换总分 
+SwapFloat(&stu[k].aver, &stu[i].aver); // 交换平均分   
+SwapLong(&stu[k].num, &stu[i].num);     // 交换学号 
+SwapChar(stu[k].name, stu[i].name);     // 交换姓名 
+		}
+	}
+}
+// 使数据按升序排序 
+int Ascending(float a, float b)
+{
+	return a < b;     // 这样比较决定了按升序排序，如果a<b，则交换 
+}
+// 使数据按降序排序 
+int Descending(float a, float b)
+{
+	return a > b;    // 这样比较决定了按降序排序，如果a>b，则交换 
+}
+// 交换两个单精度浮点型数据 
+void  SwapFloat(float *x, float *y)
+{
+float  temp;
+temp = *x; 
+*x = *y;  
+*y = temp;
+}
+// 交换两个长整型数据 
+void  SwapLong(long *x, long *y)
+{
+long   temp;
+temp = *x; 
+*x = *y;  
+*y = temp;
+}
+// 交换两个字符串 
+void  SwapChar(char x[], char y[])
+{
+char temp[MAX_LEN];
+strcpy(temp, x);
+strcpy(x, y);
+strcpy(y, temp);
+}
+// 函数功能：按选择法将数组num的元素值按从低到高排序 
+void AsSortbyNum(STU stu[], int n, int m)
+{
+	int  i, j, k, t;
+	for (i=0; i<n-1; i++)
+	{
+        /* ---------- begain ---------- */
+
+k=i;
+for (j=i+1;j<10;j++){
+if((*compare)(stu[k]num.stu[j].num)) k=j;}
+if(k!=i){t=stu[i].num;stu[i].num=stu[k].num;stu[k].num=t;}
+	
+        /* ----------- end ----------- */
+	}
+}
+// 函数功能：交换法实现字符串按字典顺序排序 
+void SortbyName(STU stu[], int n, int m)
+{
+	int  i, j, t;
+	for (i=0; i<n-1; i++)
+	{
+		  for (j = i+1; j<n; j++)
+		  {
+			  if (strcmp(stu[j].name, stu[i].name) < 0)
+			  {				  
+				  for (t=0; t<m; t++)// 交换m门课程的成绩 
+                     {
+				      SwapFloat(&stu[i].score[t], &stu[j].score[t]);
+			       } 
+SwapFloat(&stu[i].sum, &stu[j].sum);    // 交换总分 
+SwapFloat(&stu[i].aver, &stu[j].aver); // 交换平均分   
+SwapLong(&stu[i].num, &stu[j].num);     // 交换学号 
+SwapChar(stu[i].name, stu[j].name);     // 交换姓名 
+			  }
+		  }
+	 }
+}
+// 函数功能：按学号查找学生成绩并显示查找结果 
+void SearchbyNum(STU stu[], int n, int m)
+{
+	long  number;
+	int   i, j;
+	printf("Input the number you want to search:");
+	scanf("%ld", &number);	
+For(i=0;i<n;i++){
+If（strcmp(number,stu[i].num)==0)
+printf("%ld\t%s\t", stu[i].num, stu[i].name);
+			for (j=0; j<m; j++)
+			{
+				printf("%.0f\t", stu[i].score[j]);
+			}
+			printf("%.0f\t%.0f\n", stu[i].sum, stu[i].aver);
+			return;
+		}
+	}	
+	printf("\nNot found!\n");
+}
+// 函数功能：按姓名的字典顺序排出成绩表 
+void SearchbyName(STU stu[], int n, int m)
+{
+	char x[MAX_LEN];
+	int  i, j;
+	printf("Input the name you want to search:");
+	scanf("%s", x);
+	for (i=0; i<n; i++)
+	{
+		if (strcmp(stu[i].name, x) == 0)
+		{
+			printf("%ld\t%s\t", stu[i].num, stu[i].name);
+			for (j=0; j<m; j++)
+			{
+				printf("%.0f\t", stu[i].score[j]);
+			}
+			printf("%.0f\t%.0f\n", stu[i].sum, stu[i].aver);
+			return;
+		}
+	}
+	printf("\nNot found!\n");
+}
+// 函数功能：统计各分数段的学生人数及所占的百分比 
+void StatisticAnalysis(STU stu[], int n, int m)
+{
+	int  i, j, t[6];
+	for (j=0; j<m; j++)
+	{
+		printf("For course %d:\n", j+1);
+	     memset(t, 0, sizeof(t));    // 将数组t的全部元素初始化为0 
+		for (i=0; i<n; i++)
+		{
+			if (stu[i].score[j]>=0 && stu[i].score[j]<60)t[0]++;
+			else if (stu[i].score[j]<70)				   t[1]++;
+			else if (stu[i].score[j]<80)				   t[2]++;
+			else if (stu[i].score[j]<90)				   t[3]++;
+			else if (stu[i].score[j]<100)				   t[4]++;
+			else if (stu[i].score[j] == 100)      		   t[5]++;
+		}
+		for (i=0; i<=5; i++)
+		{
+            if (i==0) printf("<60\t%d\t%.2f%%\n",t[i],(float)t[i]/n*100);
+	       else if (i==5) printf("%d\t%d\t%.2f%%\n",
+(i+5)*10,t[i],(float)t[i]/n*100);
+	       else 	printf("%d-%d\t%d\t%.2f%%\n", 
+(i+5)*10, (i+5)*10+9, t[i], (float)t[i]/n*100);	
+		}
+	}
+}
+// 函数功能： 打印学生成绩 
+void PrintScore(STU stu[], int n, int m)
+{
+	int i, j;
+	for (i=0; i<n; i++)
+	{
+		printf("%ld\t%s\t", stu[i].num, stu[i].name);
+		for (j=0; j<m; j++)
+		{
+			printf("%.0f\t", stu[i].score[j]);
+		}
+		printf("%.0f\t%.0f\n", stu[i].sum, stu[i].aver);
+	}
+}
+// 输出n个学生的学号、姓名及m门课程的成绩到文件student.txt中 
+void WritetoFile(STU stu[], int n, int m)
+{
+	FILE *fp;
+	int i, j;
+     
+	if ((fp = fopen("student.txt","w")) == NULL) 
+	{ 
+		printf("Failure to open score.txt!\n");
+		exit(0);
+	}
+fprintf(fp, "%d\t%d\n", n, m);    //将学生人数和课程门数写入文件
+	for (i=0; i<n; i++)
+	{
+		fprintf(fp, "%10ld%10s", stu[i].num, stu[i].name);
+		for (j=0; j<m; j++)
+		{
+			fprintf(fp, "%10.0f", stu[i].score[j]);
+		}
+		fprintf(fp, "%10.0f%10.0f\n", stu[i].sum, stu[i].aver);
+	}
+	fclose(fp);
+}
+//从文件中读取学生的学号、姓名及成绩等信息写入到结构体数组stu中
+void ReadfromFile(STU stu[],int *n, int *m)
+{
+	FILE *fp;
+	int i, j;
+	if ((fp = fopen("student.txt","r")) == NULL) 
+	{ 
+		printf("Failure to open score.txt!\n");
+		exit(0);
+	}
+     fscanf(fp, "%d\t%d", n, m); // 从文件中读出学生人数和课程门数       
+	for (i=0; i<*n; i++)  //学生人数保存在n指向的存储单元
+	{
+		fscanf(fp, "%10ld", &stu[i].num);
+		fscanf(fp, "%10s", stu[i].name);  
+		for (j=0; j<*m; j++)//课程门数保存在m指向的存储单元
+		{
+			fscanf(fp, "%10f", &stu[i].score[j]);          //不能用%10.0f
+		}
+		fscanf(fp, "%10f%10f", &stu[i].sum, &stu[i].aver);//不能用%10.0f
+	}
+	fclose(fp);		
+}
\ No newline at end of file