[C++知识库]结构体与共同体第一节

?

?

#include<stdio.h>

void main()
{
	struct sutdent
	{
		int nun;
		char name[20];
		char sex;
		int age;
		float score;
		char addr[30];
	};
	struct sutdent sutdent1;
	struct sutdent sutdent2;
	
	printf("%lu\n", sizeof(sutdent));
}

?

?

?

#if 1
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>

void main()
{
#if 0
	struct date
	{
		int month;
		int day;
		int year;
	};
#endif

	struct student
	{
		int num;
		char *name;
		char sex;
		//struct date birthday;
		float score;
	} boy1, boy2;

	boy1.num = 007;
	boy1.name = "Jane";

	printf("Please input sex and score\n");
	scanf("%c %f", &boy1.sex, &boy1.score);

	boy2 = boy1;

	printf("Number =%d\nName = %s\n", boy2.num, boy2.name);
	printf("Sex = %c\nScore = %f\n", boy2.sex, boy2.score);
}

#endif

?

#if 1
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

void main()
{
    struct date
    {
        int month;
        int day;
        int year;
    };
    struct student
    {
        int num;
        char* name;
        char sex;
        float score;
        struct date brithday;
    };
    struct student boy1;
    struct student boy2;


    printf("Please input brithday (YY:)");
    scanf("%d", &boy1.brithday.year);
    printf("Please input brithday (MM:)");
    scanf("%d", &boy1.brithday.month);
    printf("Please input brithday (DD:)");
    scanf("%d", &boy1.brithday.day);

    boy2 = boy1;

    printf("boy1's brithday is %d-%d-%d\n", boy1.brithday.year, boy1.brithday.month, boy1.brithday.day);
    printf("boy2's brithday is %d-%d-%d\n", boy2.brithday.year, boy2.brithday.month, boy2.brithday.day);
#endif     
}

Please input brithday (YY:)2022
Please input brithday (MM:)03
Please input brithday (DD:)02
boy1's brithday is 2022-3-2
boy2's brithday is 2022-3-2

结构体变量的引用

? 结构体变量名.成员名

(2) 如果成员本身又属一个结构体类型,则要用若干个成员运算符,一级一级地找到最低的一级的成员。只能对最低级的成员进行赋值或存取以及运算。

（3）对结构体变量的成员可以像普通变量一样进行各种运算（根据其类型决定可以进行的运算）。

（4）可以引用结构体变量成员的地址，也可以引用结构体变量的地址。

#if 0
#include <stdio.h>

void main()
{
      struct student
      {
            int num;
            char *name;
            char sex;
            float score;
      } boy1;
      
      boy1.num = 007;
      boy1.name = "Jane";
      
      printf("The address of struct is %o :\n", &boy1 );
      printf("The address of num is %o :\n", &boy1.num );

}
#endif

?