-------------------------------

type struct01.c

* 基本的な使用法

#include <stdio.h>

#include <string.h>

struct rcd

{

char name[16];

char hobby[32];

int id;

char sex;

};

int main(void)

{

struct rcd record;

strcpy(record.name, "sato");

strcpy(record.hobby, "play tennis");

record.id=0x01020304;

record.sex='M';

printf("record.name =%s\n",record.name);

printf("record.hobby=%s\n",record.hobby);

printf("record.id =0x%08X\n",record.id);

printf("record.sex =%C\n",record.sex);

return 0;

}

type struct02.c

* 構造体のポインタ

#include <stdio.h>

#include <string.h>

struct rcd

{

char name[16];

char hobby[32];

int id;

char sex;

};

void sub(struct rcd *record)

{

printf("record.name =%s\n",record->name);

printf("record.hobby=%s\n",record->hobby);

printf("record.id =0x%08X\n",record->id);

printf("record.sex =%C\n",record->sex);

}

int main(void)

{

struct rcd record;

strcpy(record.name, "sato");

strcpy(record.hobby, "play tennis");

record.id=0x01020304;

record.sex='M';

sub(&record);

return 0;

}

type struct03.c

* 構造体初期化＆代入

#include <stdio.h>

struct rcd

{

char name[16];

char hobby[32];

int id;

char sex;

};

int main(void)

{

struct rcd record ={"sato","play tennis",0x01020304,'M'};

struct rcd dest;

dest=record; /*代入*/

printf("dest.name =%s\n", dest.name);

printf("dest.hobby=%s\n", dest.hobby);

printf("dest.id =0x%08X\n",dest.id);

printf("dest.sex =%C\n", dest.sex);

return 0;

}

type struct04.c

* 構造体初期化＆代入の別の例

#include <stdio.h>

struct rcd

{

char name[16];

};

int main(void)

{

struct rcd record ={"sato"};

struct rcd dest;

/* dest,name=record.name; エラー*/

dest=record; /*代入*/

printf("dest.name =%s\n", dest.name);

return 0;

}

type struct05.c

* 構造体初期化＆代入

#include <stdio.h>

#include <string.h>

struct rcd

{

char name[16];

char hobby[32];

int id;

char sex;

};

int main(void)

{

FILE* fp ;

struct rcd record;

struct rcd dest;

memset(&record,0xAA,sizeof(dest));

/* 書き込み */

if( (fp = fopen( "record.bin", "wb" )) == NULL )

return -1;

fwrite((void*)&record, sizeof(record),1,fp);

fclose( fp ) ;

strcpy(record.name, "sato");

strcpy(record.hobby, "play tennis");

record.id=0x01020304;

record.sex='M';

/* 書き込み */

if( (fp = fopen( "01.bin", "wb" )) == NULL )

return -1;

fwrite((void*)&record, sizeof(record),1,fp);

fclose( fp ) ;

memset(&dest,0xFF,sizeof(dest));

strcpy(dest.name, record.name);

strcpy(dest.hobby, record.hobby);

dest.id=record.id;

dest.sex=record.sex;

/* 書き込み */

if( (fp = fopen( "02.bin", "wb" )) == NULL )

return -1;

fwrite((void*)&dest, sizeof(dest),1,fp);

fclose( fp ) ;

memset(&dest,0xFF,sizeof(dest));

dest=record; /*代入*/

/* 書き込み */

if( (fp = fopen( "03.bin", "wb" )) == NULL )

return -1;

fwrite((void*)&dest, sizeof(dest),1,fp);

fclose( fp ) ;

return 0;

}

type struct06.c

* 構造体初期化＆代入，丸ごとコピー

#include <stdio.h>

#include <string.h>

struct rcd

{

char name[16];

char hobby[32];

int id;

char sex;

};

int main(void)

{

struct rcd record ={"sato","play tennis",0x01020304,'M'};

struct rcd dest0;

struct rcd dest1;

dest0=record; /*構文で代入*/

memcpy(&dest1,&record,sizeof(dest1)); /*標準関数で代入*/

printf("dest0.name =%s\n", dest0.name);

printf("dest0.hobby=%s\n", dest0.hobby);

printf("dest0.id =0x%08X\n",dest0.id);

printf("dest0.sex =%C\n", dest0.sex);

printf("dest1.name =%s\n", dest1.name);

printf("dest1.hobby=%s\n", dest1.hobby);

printf("dest1.id =0x%08X\n",dest1.id);

printf("dest1.sex =%C\n", dest1.sex);

return 0;

}

type struct07.c

* 構造体配列と初期化＆代入

#include <stdio.h>

#include <string.h>

#define MAX_ARRAY 4

struct rcd

{

char name[16];

char hobby[32];

int id;

char sex;

};

int main(void)

{

struct rcd record[MAX_ARRAY] ={

{"sato","play tennis",0x01020304,'M'},

{"tanaka","watch television",1,'F'},

{"suzuki","listen to music",0x12345678,'M'},

{"taro","skiing",2,'F'}

};

struct rcd dest[MAX_ARRAY];

int i;

memcpy(dest,record,sizeof(record)); /*代入*/

/* 出力 */

for(i=0;i<sizeof(record)/sizeof(record[0]);i++)

{

printf("dest[%d].name=%s\n", i,dest[i].name);

printf("dest[%d].hobby=%s\n", i,dest[i].hobby);

printf("dest[%d].id=0x%08X\n",i,dest[i].id);

printf("dest[%d].sex=%C\n", i,dest[i].sex);

printf("\n");

}

return 0;

}

type struct08.c

* 実体を取る

#include <stdio.h>

#include <string.h>

int main(void)

{

struct

{

char name[16];

char hobby[32];

int id;

char sex;

} record ;

strcpy(record.name, "sato");

strcpy(record.hobby, "play tennis");

record.id=0x01020304;

record.sex='M';

printf("record.name =%s\n",record.name);

printf("record.hobby=%s\n",record.hobby);

printf("record.id =0x%08X\n",record.id);

printf("record.sex =%C\n",record.sex);

return 0;

}

type struct09.c

* typedef

#include <stdio.h>

typedef struct

{

char name[16];

char hobby[32];

int id;

char sex;

} rcd ;

int main(void)

{

rcd record ={"sato","play tennis",0x01020304,'M'};

rcd dest;

dest=record; /*代入*/

printf("dest.name =%s\n", dest.name);

printf("dest.hobby=%s\n", dest.hobby);

printf("dest.id =0x%08X\n",dest.id);

printf("dest.sex =%C\n", dest.sex);

return 0;

}

type struct10.c

* アライメント指定(Borland C++ Compilerでは-a1

* で大きさが変わる

#include <stdio.h>

struct rcd

{

char name[16];

char hobby[32];

int id;

char sex;

};

int main(void)

{

struct rcd record;

printf("size of record=%d bytes.\n",sizeof(record));

return 0;

}

-------------------------------

type structAlign01.c

* アライメント指定(Borland C++ Compilerでは-a1

* で大きさが変わる

#include <stdio.h>

#include <stddef.h>

struct tag_alignment

{

char c0;

short s;

char c1;

char c2;

int i;

char c3;

};

int main(void)

{

struct tag_alignment alignment;

printf("size of struct tag_alignment=%d\n", sizeof(struct tag_alignment));

printf("offset of c0=%d, size of c0=%d\n",

offsetof(struct tag_alignment, c0), sizeof(alignment.c0));

printf("offset of s=%d, size of s=%d\n",

offsetof(struct tag_alignment, s), sizeof(alignment.s));

printf("offset of c1=%d, size of c1=%d\n",

offsetof(struct tag_alignment, c1), sizeof(alignment.c1));

printf("offset of c2=%d, size of c2=%d\n",

offsetof(struct tag_alignment, c2), sizeof(alignment.c2));

printf("offset of i=%d, size of i=%d\n",

offsetof(struct tag_alignment, i), sizeof(alignment.i));

printf("offset of c3=%d, size of c3=%d\n",

offsetof(struct tag_alignment, c3), sizeof(alignment.c3));

return 0;

}

type structbits01.c

* ビットの構造体

#include <stdio.h>

#include <string.h>

#if 1

struct busreset_bits /* Bus reset register (Little Endian) */

{

unsigned int nridval:1,

rsvd1:1,

nodecount:6,

root:1,

contndr:1,

irmnodeid:6,

busnumber:10,

nodenumber:6 ;

};

#else

struct busreset_bits /* Bus reset register (Big Endian) */

{

unsigned int nodenumber:6,

busnumber:10,

irmnodeid:6,

contndr:1,

root:1,

nodecount:6,

rsvd1:1,

nridval:1 ;

};

#endif

int main(void)

{

struct busreset_bits br;

memset(&br,0,4);

printf("br=0x%08X\n",br);

br.root = 1;

br.nodenumber = 63;

br.busnumber = 1023;

printf("br=0x%08X\n",br);

return 0;

}