习题（字节顺序）

 

函数原型  unsigned put_byte(unsigned x, unsigned char b ,int i)

 

返回一个无符号值，其中参数x的字节i被替换成b。  字节i是指x的第i有效位，其中最低有效位为i = 0

 

unsigned put_byte(unsigned x, unsigned char b, int i) { unsigned char* uchar_ptr; assert(i>=0&&i<sizeof(unsigned)); uchar_ptr = (unsigned char*) &x; uchar_ptr[sizeof(unsigned)-1-i] = b; return x; }

 

测试结果：