diff --git a/ztt17.md b/ztt17.md
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+//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);		
+}
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