c - 谁能解释输出

Question

#define power(a) #a
  int main()
  {
    printf("%d",*power(432));
     return 0;
  }

谁能解释一下o/p？？
o/p 是

52

Answer 1

它相当于：

printf("%d",*"432");

这相当于：

printf("%d", '4');

'4'的ASCII 值为52。

Answer 2

#define power(a) #a   //# is a stringization operation in macro
  int main()
  {
    printf("%d",*power(432));
     return 0;
  }

Hence after calling power(432), macro will return it "432" and applying * on it gives first value which is nothing but 52 (48 + 4) for '4' .