diff --git a/代码实现.c b/代码实现.c
index b7a6c46..1d2e188 100644
--- a/代码实现.c
+++ b/代码实现.c
@@ -1,5 +1,3 @@
-// 头文件的使用
-
 #include<stdio.h> 
 #include<stdlib.h>
 #include<string.h>
@@ -12,7 +10,7 @@
 
 // 结构体的定义
 
-typedef struct student{
+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
@@ -23,77 +21,77 @@ typedef struct student{
 // 函数声明
 
 int Menu(void);               //菜单显示、用户输入函数
-void ReadScore(STU stu[],int n,int m);      //学生成绩录入函数
-void AverSumofEveryStudent(STU stu[],int n,int m);     //求每个学生总分和平均分的函数
-void AverSumofEveryCourse(STU stu[],int n,int m);      //求每门课程总分和平均分的函数
-void SortbyScore(STU stu[],int n,int m,int (*compare)(float a,float b));    //选择法将数组 sum 的元素排序的函数
-int Ascending(float a,float b);     //使数据按升序排序的函数
-int Descending(float a,float b);    //使数据按降序排序的函数
-void SwapFloat(float *x,float *y);  //用于交换两个单精度浮点数的函数
-void SwapLong(long *x,long *y);     //用于交换两个长整型数据的函数
-void SwapChar(char x[],char y[]);   //用于交换两个字符串的函数
-void AsSortbyNum(STU stu[],int n,int m);      //选择法将数组 num 的元素值从低到高排序的函数
-void SortbyName(STU stu[],int n,int m);       //交换法实现字符串按字典顺序排序的函数
-void SearchbyNum(STU stu[],int n,int m);      //按学号查找学生成绩并显示查找结果的函数
-void SearchbyName(STU stu[],int n,int m);     //按姓名的字典顺序排出成绩表的函数
-void StatisticAnalysis(STU stu[],int n,int m);      //统计各分数段的学生人数及所占的百分比的函数
-void PrintScore(STU stu[],int n,int m);             //打印学生成绩的函数
-void WritetoFile(STU record[],int n,int m);         //输出学生信息到文件中的函数
-void ReadfromFile(STU record[],int *n,int *m);      //从文件中读取学生信息的函数
+void ReadScore(STU stu[], int n, int m);      //学生成绩录入函数
+void AverSumofEveryStudent(STU stu[], int n, int m);     //求每个学生总分和平均分的函数
+void AverSumofEveryCourse(STU stu[], int n, int m);      //求每门课程总分和平均分的函数
+void SortbyScore(STU stu[], int n, int m, int (*compare)(float a, float b));    //选择法将数组 sum 的元素排序的函数
+int Ascending(float a, float b);     //使数据按升序排序的函数
+int Descending(float a, float b);    //使数据按降序排序的函数
+void SwapFloat(float* x, float* y);  //用于交换两个单精度浮点数的函数
+void SwapLong(long* x, long* y);     //用于交换两个长整型数据的函数
+void SwapChar(char x[], char y[]);   //用于交换两个字符串的函数
+void AsSortbyNum(STU stu[], int n, int m);      //选择法将数组 num 的元素值从低到高排序的函数
+void SortbyName(STU stu[], int n, int m);       //交换法实现字符串按字典顺序排序的函数
+void SearchbyNum(STU stu[], int n, int m);      //按学号查找学生成绩并显示查找结果的函数
+void SearchbyName(STU stu[], int n, int m);     //按姓名的字典顺序排出成绩表的函数
+void StatisticAnalysis(STU stu[], int n, int m);      //统计各分数段的学生人数及所占的百分比的函数
+void PrintScore(STU stu[], int n, int m);             //打印学生成绩的函数
+void WritetoFile(STU record[], int n, int m);         //输出学生信息到文件中的函数
+void ReadfromFile(STU record[], int* n, int* m);      //从文件中读取学生信息的函数
 
 // 主函数
 int main(void)
 {
     char ch;
-    int n = 0,m = 0;
+    int n = 0, m = 0;
     STU stu[STU_NUM];
-    printf("Input student number(n<%d):",STU_NUM);
-    scnaf("%d",&n);
-    printf("Input course number(m<=%d):",COURSE_NUM);
-    scanf("%d",&m);
-    while(1)
+    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)
+        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 number:\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("Are you sure you want to exit?(Y/N):");
-                    printf("End of program!);
-                    exit(0);
-            default:printf("Input error!");
+        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 number:\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("Are you sure you want to exit?(Y/N):");
+            printf("End of program!");
+                exit(0);
+        default:printf("Input error!");
         }
     }
     return 0;
@@ -102,316 +100,315 @@ int main(void)
 // 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;
+    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)
+void ReadScore(STU stu[], int n, int m)
 {
-     int i,j;
-     printf("Input student's ID ,name and score:\n");
-     for(i=0,i<n;i++)     //输入n个同学
-     {
-        scanf("%ld%s",&stu[i].num,stu[i].name);
-        for(j=0;j<m;j++)       //输入m门成绩
-        scanf("%f",&stu[i].score[j]);
-     }
+    int i, j;
+    printf("Input student's ID ,name and score:\n");
+    for (i = 0; i < n; i++)     //输入n个同学
+    {
+        scanf("%ld%s", &stu[i].num, stu[i].name);
+        for (j = 0; j < m; j++)       //输入m门成绩
+            scanf("%f", &stu[i].score[j]);
+    }
 }
 
 //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)
+void AverSumofEveryStudent(STU stu[], int n, int m)
 {
-   int i,j;
-   for(i=0;i<n;i++)
-   {
+    int i, j;
+    for (i = 0; i < n; i++)
+    {
         stu[i].sum = 0;   //初始化每个学生总分为0
-        for(j=0;j<m;j++)
+        for (j = 0; j < m; j++)
         {
-                stu[i].sum = stu[i].sum + stu[i].score[j];    //累加分数
+            stu[i].sum = stu[i].sum + stu[i].score[j];    //累加分数
         }
-        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);
-   }
+        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)
+void AverSumofEveryCourse(STU stu[], int n, int m)
 {
-    int i,j;
-    float sum[COURSE_NUM],aver[COURSE_NUM];
-    for(j=0;j<m;j++)
+    int i, j;
+    float sum[COURSE_NUM], aver[COURSE_NUM];
+    for (j = 0; j < m; j++)
     {
         sum[j] = 0;
-        for(i=0;i<n;i++)
+        for (i = 0; i < n; i++)
         {
-                sum[j]+= stu[i].score[j];   //计算n个同学每门课程的总分
+            sum[j] += stu[i].score[j];   //计算n个同学每门课程的总分
 
         }
-        aver[j] = sum[j]/i;
-        printf("course %d: sum = %.0f,aver = %.0f\n",j+1, sum[j], aver[j]);
+        aver[j] = sum[j] / i;
+        printf("course %d: sum = %.0f,aver = %.0f\n", j + 1, sum[j], aver[j]);
     }
 }
 
 //函数功能：按选择法将数组 sum 的元素值排序
-voidSortbyScore(STU stu[],int n,int m,int(*compare)(float a,float b))
+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
-		}
-	}
+    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)
+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
+    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)
+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
+    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)
+void SwapFloat(float* x, float* y)
 {
-        float  temp;
-        temp = *x;
-        *x = *y;
-        *y = temp;
+    float  temp;
+    temp = *x;
+    *x = *y;
+    *y = temp;
 }
 
 //交换两个长整型数据
-void SwapLong(long *x,long *y)
+void SwapLong(long* x, long* y)
 {
-        long temp;
-        temp = *x;
-        *x = *y;
-        *y = temp;
+    long temp;
+    temp = *x;
+    *x = *y;
+    *y = temp;
 }
 
 //交换两个字符串
-void SwapChar(char x[],chary[])
+void SwapChar(char x[], char y[])
 {
-        char temp[MAX_LEN];
-        strcpy(temp, x);
-        strcpy(x, y);
-        strcpy(y, temp);
+    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 的元素从低到高排序
-void AsSortbyNum(STU stu[],int n,int m)
+void AsSortbyNum(STU stu[], int n, int m)
 {
-     	int  i, j, k, t;
-	for (i=0; i<n-1; i++)
-	{
-			int  i, j, k, t;
-		k = i;
-		for (j=i+1; j<n; j++)
-		{
-		if (stu[j].num < stu[k].num) 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
-		}
-	}
+    int  i, j, k, t;
+    for (i = 0; i < n - 1; i++)
+    {
+        k = i;
+        for (j = i + 1; j < n; j++)
+        {
+            if (stu[j].num < stu[k].num) 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
+        }
+    }
 }
 
 //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)
+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
-			  }
-		  }
-	 }
+    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)
+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(stu[i].num==number)
-            {
-                printf("\n");
-                for(j=0;j<m;j++)
-                  printf("%d\t",stu[i].score[j]);
-                printf("\n");
-                break;
-            }
-        if(i==n)
+    long number;
+    int i, j;
+    printf("Input the number you want to search:");
+    scanf("%ld", &number);
+    for (i = 0; i < n; i++)
+        if (stu[i].num == number)
+        {
+            printf("\n");
+            for (j = 0; j < m; j++)
+                printf("%d\t", stu[i].score[j]);
+            printf("\n");
+            break;
+        }
+    if (i == n)
         printf("\nNot found!\n");
 }
 
 //函数功能：按姓名查找学生成绩并显示查找结果
-void SearchbyName(STU stu[],int n,int m)
+void SearchbyName(STU stu[], int n, int m)
 {
     char x[MAX_LEN];
-    int i,j;
+    int i, j;
     printf("Input the name you want to search:");
     scanf("%s", x);
-    for(i=0;i<n;i++)
+    for (i = 0; i < n; i++)
     {
-        if(strcmp(stu[i].name,x)==0)
+        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("%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);
+    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)
+void StatisticAnalysis(STU stu[], int n, int m)
 {
-        int i,j,t[6];
-        for(j=0;j<m;j++)
+    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++)
         {
-                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);
-                }
+            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)
+void PrintScore(STU stu[], int n, int m)
 {
-        int i,j;
-        for (i=0; i<n; i++)
+    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("%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);
+            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)
+void WritetoFile(STU stu[], int n, int m)
 {
-        FILE *fp;
-        int i, j;
+    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++)
+    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, "%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);
+            fprintf(fp, "%10.0f", stu[i].score[j]);
         }
-        fclose(fp);
+        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 stu 中
-void ReadfromFile(STU stu[],int *n,int *m)
+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，课程门数    
-	for (i=0; i<*n; i++)  //学生人数保存在n指向的储存单元
-	{
-		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指向的储存单元
-		{
-			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);	
+    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，课程门数    
+    for (i = 0; i < *n; i++)  //学生人数保存在n指向的储存单元
+    {
+        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指向的储存单元
+        {
+            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