整型值和字符数组在内存中存储方式-优快云博客

本文详细解读了C语言中用于打印字符串和数据的自定义函数printf_buf，并通过实验代码展示了其使用方法及特性。包括变量类型转换、内存复制和输出格式控制等关键知识点。

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void printf_buf(char *str_par,char *data_par,short len_par)
{
short i;

printf("%s ",str_par);
for(i=0;i<len_par;i++)
printf("%02x ",*(data_par+i));
printf("\n");
}

int main()
{
unsigned short a = 0x55aa;
char src[2];
char sdst[2];
short idst =0;
short *ptr = NULL;
unsigned char b;

b=a;
printf("1b=%x\n",b);
b = a>>7;
printf("2b=%x\n",b);
printf("\n");
printf("1a=%x\n",a);
memcpy(sdst,(void*)&a,2);
printf_buf("2sdst:",sdst,2);

src[0] = 0x12;
src[1] = 0x34;
ptr =(short *) src;
printf("3ptr=%x\n",*ptr);
printf_buf("4src:",src,2);
memcpy(sdst,src,2);
printf_buf("5sdst:",sdst,2);
memcpy((void *)&idst,src,2);
printf("6idst=%x\n",idst);
memcpy(sdst,(void*)&idst,2);
printf_buf("7sdst::",sdst,2);

src[0] = 0x12;
src[1] = 0x34;
idst = src[0];
idst<<=8;
idst += src[1];
printf("8idst = %x\n",idst);
memcpy(&idst, src, 2);
printf("9idst2 = %x\n",idst);
return 0;
}