ios-c_day13___ Structural Body

2015.2.4

#include <stdio.h>

#include <string.h>

struct

struct Goods

//{

Char name[20];

float price;

Long amount;

//};

//

int main (int argc, const char * argv[]) {

struct Goods book;

strcpy (Book.name, "kingdoms");

printf ("Len =%ld\n", strlen (Book.name));

Book.price = 12.8;

Book.amount = 1000;

//

printf ("Name:%s Price:%.2f Amount:%ld\n", Book.name, Book.price,book.amount);

//

return 0;

//}

Declaring a data type

typedef struct STUDENT

//{

Char name[20];

int age;

int num;

}stu;

//

int main (int argc,const char *argv[])

//{

STU STU;

strcpy (Stu.name, "Xiao Hong");

Stu.age = 12;

Stu.num = 50;

printf ("Name:%s\nage:%d\nnum:%d\n", stu.name,stu.age,stu.num);

//

return 0;

//}

1. Use a

typedef unsigned char uint_8;

typedef unsigned short uint_16;

typedef unsigned int uint_32;

typedef unsigned long uint_64;

//

typedef int INT_32;

//

int main (int argc,const char *argv[])

//{

Uint_32 a=100;

printf ("A =%d\n", a);

//

return 0;

//}

2. Alias a struct

3. Declaring Complex types

Int (*p) (int,int);

typedef int (*PFUNC) (int,int);//int (*) (Int,int)

//

int add (int a, int b)

//{

return a+b;

//}

//

int main (int argc,const char *argv[])

//{

Pfunc P=add;

printf ("%d\n", p (3,5));

//

return 0;

//}

Name of the province about structure

Common Methods 1

Struct names can be the same as data type names

typedef struct student{

Char name[20];

int age;

}student;

Common Method Two

typedef struct {

Char name[20];

int age;

}student;

int main (int argc, const char *argv[])

//{

struct Student stu={"Little Red", 12};

//

printf ("name =%s, age =%d\n", stu.name,stu.age);

//

return 0;

//}

struct-Body pointer

typedef struct {

Char name[20];

int age;

}student,*pstudent;

To access member variables in a struct by using the-I operator

int main (int argc, const char *argv[])

//{

Pstudent pstu = NULL;

Student stu={"Xiao Hua", 22};

Pstu = &stu;

//

printf ("name =%s age =%d\n", pstu->name,pstu->age);

return 0;

//}

struct array

int main (int argc,const char *argv[])

//{

Student *pstu;

Student Stu;

Pstu = &stu;

//

scanf ("%s%d", stu.name,&stu.age);

scanf ("%s%d", pstu->name,&pstu->age);

//

printf ("name =%s, age =%d\n", stu.name,stu.age);

return 0;

//}

int main (int argc,const char *argv[])

//{

Student stu[5]={{"Xiao Hua", 12},{"small Music", 8},{"Floret", 10},{"small Fly", 14},{"small Yellow", 7};

//

for (int i=0; i<5-1; i++) {

for (int j=0; j<5-i-1; J + +) {

if (Stu[j].age > Stu[j+1].age) {

Student Temp=stu[j];

STU[J]=STU[J+1];

Stu[j+1]=temp;

//            }

//        }

//    }

for (int i=0; i<5; i++) {

printf ("%s-----%d\n", stu[i].name,stu[i].age);

//    }

//

return 0;

//}

int main (int argc,const char *argv[])

//{

Student stu[5]={{"Xiao Hua", 12},{"small Music", 8},{"Floret", 10},{"small Fly", 14},{"small Yellow", 7};

Pstudent pstu = stu;

//

for (int i=0; i<5-1; i++) {

for (int j=0; j<5-i-1; J + +) {

if ((pstu+j)->age > (pstu+j+1)->age) {

Student temp=* (PSTU+J);

* (PSTU+J) =* (pstu+j+1);

* (pstu+j+1) =temp;

//            }

//        }

//    }

for (int i=0; i<5; i++) {

printf ("%s-----%d\n", (Pstu+i)->name, (pstu+i)->age);

//    }

//

return 0;

//}

Structure nesting

The wording of a

typedef struct {

Char name[20];

int age;

struct Date

//    {

int year;

int month;

int day;

}date;//declaring a variable directly when declaring a data type

char sex;

}employer;

Two

typedef struct DATE

//{

int year;

int month;

int day;

}date;

//

typedef struct {

Char name[20];

int age;

Date date;

char sex;

}employer;

//

//

int main (int argc,const char *argv[])

//{

Employer xiaohua={"Xiao Hua", 12,{2014,12,4},1};

printf ("name:%s age:%d%d months%d days, gender:%d\n", Xiaohua.name,xiaohua.age, Xiaohua.date.year,xiaohua.date.month, Xiaohua.date.day, Xiaohua.sex);

//

//

return 0;

//}

Declaring struct-body types

struct student{

Char name[20];

int age;

//};

Declaring a struct type defines a variable at the same time

struct Student

//{

Char name[20];

int age;

}xiaohong={"Xiao Hong", 15},xiaohua;

struct

//{

Char name[20];

int age;

}xiaohong={"Xiao Hong", 15},xiaohua;

3. Name the structure

typedef struct {

Char name[20];

int age;

}student;

//

int main (int argc,const char *argv[])

//{

struct Student stu;

Student Xiaohong;

//

printf ("%s%d\n", xiaohong.name,xiaohong.age);

//

//

return 0;

//}

Structure size

is not the sum of member variables, which is the size of the memory after the member variable is aligned

typedef struct {

Double F2;

Char name[15];

int A;

Long B;

Long double L;

float F;

}structsize;

int main (int argc,const char *argv[])

{

printf ("%ld\n", sizeof (StructSize));

return 0;

}

ios-c_day13___ Structural Body