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                # 在命令行中預定義宏 ## 例子 #include <stdio.h> int main (void) { int i, sum; for (i = 1, sum = 0; i <= 10; i++) { sum += i; #ifdef DEBUG printf ("sum += %d is %d\n", i, sum); #endif } printf ("total sum is %d\n", sum); return 0; } ## 技巧 使用`-D`選項可以在命令行中預定義一個宏,比如: $ gcc -D DEBUG macro.c 中間可以沒有空格: $ gcc -DDEBUG macro.c 詳情參見[gcc手冊](https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html#Preprocessor-Options) ## 貢獻者 xmj
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