普通类型与自定义类型之间的转化

 1 typedef union MultiByte
 2 {
 3     unsigned int word;
 4     unsigned char byte[sizeof(unsigned int)];
 5 }multiByte_t;
 6 
 7 float _value_from_prase(uint32_t arg)
 8 {
 9     /* 方法一 */
10     multiByte_t *parse = (multiByte_t *)&arg;
11     
12     /* 方法二 */
13     multiByte_t parse;
14     parse.word = arg;
15 }