struct str4_t
{
	unsigned char c1[1];
	unsigned char c2[2];
	unsigned char c3[3];
	unsigned char c4[5];	
}str4;

struct str3_t
{unsigned char ac[3];unsigned short s;
}str3;

struct str2_t
{unsigned short s;unsigned int i;unsigned char c;	
}str2;

#include <stdio.h>
#include <string.h>#define BUFFERSIZE   120
unsigned char *p;struct str1_t
{unsigned char c;unsigned short s;unsigned int i;unsigned long l;	
}str1;struct str2_t
{unsigned short s;unsigned int i;unsigned char c;	
}str2;struct str3_t
{unsigned char ac[3];unsigned short s;
}str3;struct str4_t
{unsigned char c1[1];unsigned char c2[2];unsigned char c3[3];unsigned char c4[5];	
}str4;int main()
{int in,i,len;in = 0x12345678;p = (unsigned char *)∈len = sizeof(in);printf("int size:%d\r\n", len);for(i=0; i<len; i++)printf("%2X ", *(p+i));printf("\r\n\r\n");str1.c = 0x12;str1.s = 0x34;str1.i = 0x56;str1.l = 0x78;p = (unsigned char *)&str1;len = sizeof(str1);printf("str1 size:%d\r\n", len);for(i=0; i<len; i++)printf("%2X ", *(p+i));printf("\r\n\r\n");str2.s = 0x12;str2.i = 0x34;str2.c = 0x56;p = (unsigned char *)&str2;len = sizeof(str2);printf("str2 size:%d\r\n", len);for(i=0; i<len; i++)printf("%2X ", *(p+i));printf("\r\n\r\n");str3.ac[0] = 0x12;str3.ac[1] = 0x34;str3.ac[2] = 0x56;str3.s = 0x78;p = (unsigned char *)&str3;len = sizeof(str3);printf("str3 size:%d\r\n", len);for(i=0; i<len; i++)printf("%2X ", *(p+i));printf("\r\n\r\n");str4.c1[0] = 0x1;str4.c2[0] = 0x2;str4.c2[1] = 0x3;str4.c3[0] = 0x4;str4.c3[1] = 0x5;str4.c3[2] = 0x6;str4.c4[0] = 0x7;str4.c4[1] = 0x8;str4.c4[2] = 0x9;str4.c4[3] = 0xa;str4.c4[4] = 0xb;p = (unsigned char *)&str4;len = sizeof(str4);printf("str4 size:%d\r\n", len);for(i=0; i<len; i++)printf("%2X ", *(p+i));printf("\r\n\r\n");unsigned short s = 0xF1;unsigned int i2 = 0xF2;unsigned char c = 0xF3;unsigned char buffer2[20];//avoid the memery overflowmemset(buffer2, 0 , sizeof(buffer2));struct str2_t *pstr2;pstr2 = (struct str2_t *)&s;printf("%X %X %X\r\n", pstr2->s, pstr2->i, pstr2->c);return 0;
}