C語言中，調用成員變量用點還是用箭頭，取決于當前的ID是指針還是結構體本身。

如：typedef?struct?{

float?height;

float?weight;

}?Person;

int?main(int?argc,?char?*argv[])?{

Person?jiushen;

Person?*lengleng?=?(Person?*)malloc(sizeof(Person));

//注意這里結構體指針的聲明，要分配空間

jiushen.weight?=?60;

jiushen.height?=?175;

lengleng?->?height?=?165;

(*lengleng).weight?=?50;

printf("%f,?%f\n",?jiushen.weight,?lengleng->weight);

}

可以看出，對于指針lengleng,

lengleng -> weight

等價于

(*lengleng).weight