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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <ctype.h>
  4.  
  5. // 联合体定义，用于浮点数和字节数组之间的转换
  6. typedef union {
  7.     float fdata;
  8.     unsigned long ldata;
  9. } u_float_long_union;
  10.  
  11. // 函数声明
  12. float hex_to_float(const char* hex_str);
  13. int hex_string_to_bytes(const char* hex_str, unsigned char* bytes, int max_bytes);
  14. unsigned char hex_char_to_byte(char c);
  15.  
  16. int main() {
  17.     char input[256];
  18.  
  19.     printf("16进制转浮点数转换器\n");
  20.     printf("请输入16进制字节序列(例如: A1 92 61 C2 或 A19261C2):\n");
  21.  
  22.     while(1) {
  23.         printf("> ");
  24.         if(fgets(input, sizeof(input), stdin) == NULL) {
  25.             break;
  26.         }
  27.  
  28.         // 去除换行符
  29.         input[strcspn(input, "\n")] = 0;
  30.  
  31.         // 检查是否退出
  32.         if(strcmp(input, "exit") == 0 || strcmp(input, "quit") == 0) {
  33.             break;
  34.         }
  35.  
  36.         // 跳过空行
  37.         if(strlen(input) == 0) {
  38.             continue;
  39.         }
  40.  
  41.         // 转换并显示结果
  42.         float result = hex_to_float(input);
  43.         printf("浮点数结果: %f\n\n", result);
  44.     }
  45.  
  46.     printf("程序结束\n");
  47.     return 0;
  48. }
  49.  
  50. // 将16进制字符串转换为浮点数
  51. float hex_to_float(const char* hex_str) {
  52.     unsigned char bytes[4];
  53.     int count = hex_string_to_bytes(hex_str, bytes, 4);
  54.  
  55.     if(count != 4) {
  56.         printf("错误: 需要4个字节的数据，但只提供了%d个字节\n", count);
  57.         return 0.0f;
  58.     }
  59.  
  60.     u_float_long_union converter;
  61.     converter.ldata = (unsigned long)bytes[0] | 
  62.                      ((unsigned long)bytes[1] << 8) |
  63.                      ((unsigned long)bytes[2] << 16) |
  64.                      ((unsigned long)bytes[3] << 24);
  65.  
  66.     return converter.fdata;
  67. }
  68.  
  69. // 将16进制字符串转换为字节数组
  70. int hex_string_to_bytes(const char* hex_str, unsigned char* bytes, int max_bytes) {
  71.     int count = 0;
  72.     int i = 0;
  73.     int len = strlen(hex_str);
  74.  
  75.     while(i < len && count < max_bytes) {
  76.         // 跳过空格
  77.         while(i < len && isspace(hex_str[i])) {
  78.             i++;
  79.         }
  80.  
  81.         if(i >= len) {
  82.             break;
  83.         }
  84.  
  85.         // 提取两个16进制字符
  86.         char high_nibble = hex_str[i++];
  87.         char low_nibble = (i < len) ? hex_str[i++] : '0';
  88.  
  89.         // 如果下一个字符不是16进制数字，则跳过
  90.         if(!isxdigit(low_nibble)) {
  91.             low_nibble = '0';
  92.             i--; // 回退一个字符
  93.         }
  94.  
  95.         // 转换并存储字节
  96.         bytes[count++] = (hex_char_to_byte(high_nibble) << 4) | hex_char_to_byte(low_nibble);
  97.     }
  98.  
  99.     return count;
  100. }
  101.  
  102. // 将16进制字符转换为对应的数值
  103. unsigned char hex_char_to_byte(char c) {
  104.     if(c >= '0' && c <= '9') {
  105.         return c - '0';
  106.     }
  107.     if(c >= 'A' && c <= 'F') {
  108.         return c - 'A' + 10;
  109.     }
  110.     if(c >= 'a' && c <= 'f') {
  111.         return c - 'a' + 10;
  112.     }
  113.     return 0; // 非16进制字符返回0
  114. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
48 43 2D 40
stdout 
16进制转浮点数转换器
请输入16进制字节序列(例如: A1 92 61 C2 或 A19261C2):
> 浮点数结果: 2.707232

> 程序结束
https://ideone.com/nE98Wv
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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