4.3結構體

//通過指向結構體變量的指針變量輸出結構體變量中成員的信息
/*#include <stdio.h>
#include <string.h>
int main()
{
	struct Student
	{
		long num;
		char name[20];
		char sex;
		float score;
	};
	struct Student stu_1;							//定義struct_Student類型的變量stu_1
	struct Student *p;							//定義指向struct Student類型數據的指針變量p
	p = &stu_1;								//p指向stu_1
	stu_1.num = 10101;							//對結構體變量的成員賦值
	strcpy(stu_1.name,"Li lin");						//用字符串賦值函數給stu_1.name賦值
	stu_1.sex = 'M';
	stu_1.score = 89.5;
	printf("No.:%ld\nname:%s\nsex:%c\nscore:%5.1f\n",			//輸出結果
			stu_1.num,stu_1.name,stu_1.sex,stu_1.score);
	printf("No.:%ld\nname:%s\nsex:%c\nscore:%5.1f\n",
			( *p ).num,( *p ).name,( *p ).sex,( *p ).score);
	return 0;
}*/
//有3個學生的信息，放在結構體數組中，要求輸出全部學生的信息
/*#include <stdio.h>
struct Student
{
	int num;
	char name[20];
	char sex;
	int age;
};
struct Student stu[3] = {{10101,"Li lin",'M',18},{10102,"Zhang Fang",'M',19},
						{10104,"Wang Min",'F',20}};
int main()
{
	struct Student *p;
	printf("N0.   Name		   sex age\n");
	for( p = stu; p < stu+3; p++ )
		printf("%5d %-20s %2c %4d\n",p->num,p->name,p->sex,p->age);
	return 0;
}*/
//有n個結構體變量，內含學生學號，姓名和3門課程的成績。要求輸出平均成績最高的學生的信息；
/*#include <stdio.h>
#define N 3
struct Student
{
	int num;
	char name[20];
	float score[3];
	float aver;
};

int main()
{
	void input(struct Student stu[]);
	struct Student max(struct Student stu[]);
	void print(struct Student stu);
	struct Student stu[N],*p = stu;						//定義結構體數組和指針
	input(p);								//調用input函數，實參是結構體指針變量p
	print(max(p));								//調用print函數，以max函數的返回值作爲實參
	return 0;
}
void input(struct Student stu[])
{
	int i;
	printf("請輸入各學生的信息：學號，姓名，三門課成績：\n");
	for( i = 0; i < N; i++ )
	{
		scanf("%d %s %f %f %f",&stu[i].num,stu[i].name,
				&stu[i].score[0],&stu[i].score[1],&stu[i].score[2]);
		stu[i].aver = (stu[i].score[0]+stu[i].score[1]+stu[i].score[2])/3.0;
	}
}
struct Student max(struct Student stu[])
{
	int i,m = 0;
	for(i = 0; i < N; i++)
		if ( stu[i].aver > stu[m].aver )
			m = i;
	return stu[m];
}
void print(struct Student stud)
{
	printf("\n成績最高的學生是:\n");
	printf("學號:%d\n姓名:%s\n三門課成績:%5.1f,:%5.1f,:%5.1f\n平均成績：%6.2f\n",
		stud.num,stud.name,stud.score[0],stud.score[1],stud.score[2],stud.aver);
}*/