如何将十六进制数字转换为c ++中的字符？ [英] How do I convert hex numbers to a character in c++?

问题描述

我试图将一个十六进制数字转换为C ++中的一个字符。
我查了一下，但找不到适合我的答案。

这是我的代码：

$ p $ char $ mod_tostring（int state， int index，int size）{
int stringAddress = lua_tolstring（state，index，0）;
const char * const Base =（const char * const）stringAddress;
返回Base [0];
};

Base [0]会返回一个十六进制数字，例如：
0000005B

如果您在这里 http：//字符串函数。 com / hex-string.aspx 并将0000005B作为输入输出字符[。如何输出[？

解决方案

要将数字打印为字符，可以将其分配给 char 变量或将其转换为 char 类型：

  unsigned int value = 0x5B; 
 char c = static_cast< char>（value）; 
 cout<< 0x5B的字符是'<< c< `和'<< static_cast< char>（value）<<  \\\
; 
  

您也可以使用 snprintf ：

  char text_buffer [128]; 
 unsigned int value = 0x5B; 
 snprintf（& text_buffer [0]，sizeof（text_buffer），
％c\\\
，value）; 
 puts（text_buffer）; 
  

示例程序：

  #include< iostream> 
 #include< cstdlib> 
 
 int main（）
 {
 unsigned int value = 0x5B; 
 char c = static_cast< char>（value）; 
 std :: cout<< 0x5B的字符是'<< c< `和'<< static_cast< char>（value）<<  \\\
; 
 
 std :: cout<< \\\

 << 暂停，按Enter键继续。 
 std :: cin.ignore（1000000，'\\\
'）; 
返回EXIT_SUCCESS; 
} 
  

输出：

  $ ./main.exe 
 0x5B的字符是'[`和'['
 
暂停。按Enter继续。 
  

I'm trying to convert a hex number to a character in C++. I looked it up but I can't find an answer that works for me.

Here is my code:

char mod_tostring(int state, int index, int size) {
    int stringAddress = lua_tolstring(state, index, 0);
    const char* const Base = (const char* const)stringAddress;
    return Base[0];
};

Base[0] would return a hex number like: 0000005B

If you go here http://string-functions.com/hex-string.aspx and put 0000005B as the input it outputs the character "[". How would I also output [?

解决方案

To print a number as a character, you can either assign it to a char variable or cast it to a char type:

unsigned int value = 0x5B;
char c = static_cast<char>(value);
cout << "The character of 0x5B is '" << c << "` and '" << static_cast<char>(value) << "'\n";

You could also use snprintf:

char text_buffer[128];
unsigned int value = 0x5B;
snprintf(&text_buffer[0], sizeof(text_buffer),
         "%c\n", value);
puts(text_buffer);

Example program:

#include <iostream>
#include <cstdlib>

int main()
{
    unsigned int value = 0x5B;
    char c = static_cast<char>(value);
    std::cout << "The character of 0x5B is '" << c << "` and '" << static_cast<char>(value) << "'\n";

    std::cout << "\n"
              << "Paused.  Press Enter to continue.\n";
    std::cin.ignore(1000000, '\n');
    return EXIT_SUCCESS;
}

Output:

$ ./main.exe
The character of 0x5B is '[` and '['

Paused.  Press Enter to continue.

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