计算平均分

file

@@ -85,4 +85,76 @@ case 12:WritetoFile(stu, n, m);
 			default:printf("Input error!");
 		}
 	}
-	return 0;}
+	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 ----------- */
+}