diff --git a/src b/src
index 66dc905..a2e2870 100644
--- a/src
+++ b/src
@@ -1 +1,109 @@
-undefined
\ No newline at end of file
+#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;
+}