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マクロ引数に与えられたパラメーターを文字列として展開させる。

C++

C++でマクロを使う。

マクロに渡された引数を文字列に展開して扱う事が可能。
以下に出力された通り。

どうするか
マクロ引数の先頭に'#'をつける。

c++
#define PRINTX(x, v)  printf(#x, v);

int main()
{
    int n=0;
    PRINTX("%d\n", n);
    printf("\n");
    PRINTX(%d\n, n);
}
出力
"0\n"
0
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