C-switchcase之如何巧妙判断范围区域当判断整数时
⽰例: 判断整数范围
#include <stdio.h>
int main()
{
unsigned char buf[6]={0x00,0x07,0x11,0x60,0x61,0x66};
for(int i=0;i<6;i++)
switch(buf[i])
{
case0x00 ... 0x10: printf("buf[%d] is 0x0 ~0x10\n",i);  break;
case0x11 ... 0x20: printf("buf[%d] is 0x11~0x20\n",i);  break;
case0x30 ... 0x60: printf("buf[%d] is 0x30~0x60\n",i);  break;
case0x61 ... 0xff: printf("buf[%d] is 0x61~0xff\n",i);  break;
}
}
switch case判断字符串打印:
当判断字符时
⽰例: 将"0x00"~"0xff"转化为数值0x00~0xff
#include <stdio.h>
int main()
{
char buf[6][6]={"0xff","0X02","0X1f","0xf1","0xa1","0Xb0"};
for(int i=0;i<6;i++)
if(buf[i][0]=='0'&&(buf[i][1]=='x' || buf[i][1]=='X'))    //匹配前缀
{
unsigned char val=0;
int err=0;
for(int j=2;j<4;j++)
switch(buf[i][j])
{
case'0' ... '9' :  val= val*16 + (buf[i][j]-'0'); break;
case'a' ... 'f' :  val= val*16 + (buf[i][j]-'a'+10); break;
case'A' ... 'F' :  val= val*16 + (buf[i][j]-'A'+10); break;
default :  err =1;  break;
}
if(!err)
printf("buf[%d]  = 0X%02X\n",i,val);
else
printf("buf[%d]  ERR \n",i);
}
else
printf("buf[%d]  ERR \n",i);
}
打印:

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