c - 誰でも出力を説明できますか

Question

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

誰かがo / pを説明できますか??
o/p は

52

Answer 1

これは以下と同等です:

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

これは次と同等です:

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

の ASCII 値は'4'です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' .