編譯時期變數 – FILE, LINE, DATE, TIME, STDC.
程式範例
檔案：macroVar.c
#include <stdio.h>
int main(void) {
// #line 100 "renameFromMacroVar.c"
printf("Compiling %s, line: %d, on %s, at %s, STDC=%d",
__FILE__, __LINE__, __DATE__, __TIME__, __STDC__);
return 0;
}
執行結果
D:\cp>gcc macroVar.c -o macroVar
D:\cp>macroVar
Compiling macroVar.c, line: 6, on Sep 2 2010, at 14:55:30, STDC=1