给出两个字符串,我必须读取它们的每个unicode值的十六进制2位数字值。忽略ASCII字符。
char * str1 = "⍺";
char * str2 = "alpha is ⍺, beta is β and mu is µ";
我尝试使用printf("<%02x>\n", str1);
打印这些值,但似乎该值是错误的((unsigned char)
也执行了该操作,而且似乎没有用)。
输出应该是这样的
<e2>
<e8><a2><2e>
这是我的完整代码:
#include <stdio.h>
#include <string.h>
char *str1 = "⍺";
char *str2 = "alpha is ⍺, beta is β and mu is µ";
char *str3 = "β";
char *str4 = "µ";
int main(){
printf("<%x>\n", (unsigned char) * str1);
printf("<%x>", (unsigned char) * str1);
printf("<%x>", (unsigned char) * str3);
printf("<%x>\n", (unsigned char) * str4);
}
答案 0 :(得分:0)
此代码遍历字符串的字节,并标识“ ASCII”字符(Unicode U + 0000 .. U + 007F),通常不打印它们,对于U + 0080以上的Unicode字符,打印出<
,代表该字符的一系列十六进制数字对,最后打印出一个>
,最后是><
,中间的#include <ctype.h>
#include <stdbool.h>
#include <stdio.h>
static void dump_str(const char *s);
static bool print_ascii = false;
int main(int argc, char **argv)
{
const char *strings[] =
{
"⍺",
"alpha is ⍺, beta is β and mu is µ",
"At -37ºC, the £ and the € fall apart",
"嬀£Åºüÿ",
"⍺βµ",
};
enum { NUM_STRINGS = sizeof(strings) / sizeof(strings[0]) };
// Use argv - my compilation options don't allow unused parameters to a function
if (argc > 1 && argv[argc] == NULL)
print_ascii = true;
for (int i = 0; i < NUM_STRINGS; i++)
dump_str(strings[i]);
return 0;
}
static void dump_str(const char *s)
{
int c;
bool printing_ascii = true;
while ((c = (unsigned char)*s++) != '\0')
{
if (isascii(c))
{
if (!printing_ascii)
{
printing_ascii = true;
putchar('>');
}
if (print_ascii)
putchar(c);
}
else
{
if (printing_ascii)
{
printing_ascii = false;
putchar('<');
}
else
{
if ((c & 0xC0) != 0x80)
{
putchar('>');
putchar('<');
}
}
printf("%2x", c);
}
}
if (!printing_ascii)
putchar('>');
putchar('\n');
}
分隔了单独的UTF8编码的Unicode字符。如果您传入一个或多个参数,它也会打印“ ASCII”字符,但会以十六进制编码形式显示。
utf8-97
我调用了程序$ ./utf8-97
<e28dba>
<e28dba><ceb2><c2b5>
<c2ba><c2a3><c2a0><e282ac>
<c3a5><c2ac><e282ac><c2a3><c385><c2ba><c3bc><c3bf>
<e28dba><ceb2><c2b5>
$ ./utf8-97 1
<e28dba>
alpha is <e28dba>, beta is <ceb2> and mu is <c2b5>
At -37<c2ba>C, the <c2a3><c2a0>and the <e282ac> fall apart
<c3a5><c2ac><e282ac><c2a3><c385><c2ba><c3bc><c3bf>
<e28dba><ceb2><c2b5>
$
;运行时,它给了我
<c2a0>
Error: cannot allocate vector of size 5.6 Mb
序列用于一个不间断的空格,我在磅符号£后面意外地在代码中放置了空格。如果您从答案中复制代码,我不确定是否能得到。