123

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "files.associations": {
+        "src": "c"
+    }
+}

src

@@ -174,4 +174,206 @@ SwapLong(&stu[k].num, &stu[i].num);     // 交换学号
 SwapChar(stu[k].name, stu[i].name);     // 交换姓名 
         }
     }
+}
+// 5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 
+}
+// 6使数据按降序排序 
+int Descending(float a, float b)
+{
+    return a > b;
+}
+// 7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;
+}
+// 8交换两个长整型数据 
+void  SwapLong(long *x, long *y)
+{
+long   temp;
+temp = *x; 
+*x = *y;  
+*y = temp;
+}
+// 9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);
+}
+// 10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++)
+    {
+        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;}
+    }
+}
+// 11函数功能：交换法实现字符串按字典顺序排序 
+void AsSortbyNum(STU stu[], int n, int m)
+{
+    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++)          
+              {
+                   SwapFloat(&stu[k].score[t], &stu[i].score[t]);
+            }
+SwapFloat(&stu[k].sum, &stu[i].sum);  
+SwapFloat(&stu[k].aver, &stu[i].aver);   
+SwapLong(&stu[k].num, &stu[i].num);     
+SwapChar(stu[k].name, stu[i].name);  
+        }
+    }
+}
+// 12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 (stu[i].num==number)
+        {
+            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");
+}
+}
+// 13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");
+}
+// 14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)); 
+        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);    
+        }
+    }
+}
+// 15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);
+    }
+}
+// 16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);
+}
+//17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);        
 }