C语言简单赋值有关问题

C语言简单赋值问题求助
unsigned char *key=NULL;

請問如何為key賦值為 0x11，0x9A ，0x55 ?

[解决办法]

C/C++ code

//加头文件malloc.hkey = (unsigned char *)malloc(sizeof(unsigned char)*3);//分配内存空间//赋值key[0]=0x11;key[1]=0x9a;key[2]=0x55;