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  1. spiderling66

    macro unsafe?

    thanks Salem. :)
  2. spiderling66

    macro unsafe?

    hi guys. i hava no idea why the macro is unsafe, i just want the number(x) is always positive. could anyone tell me why, please? #define number(x) x < 0 ? -x : x
  3. spiderling66

    accuracy lost

    i am looking for the average of these double numbers, but i always got 5.0000, it's the accuracy lost, could anyone tell me what the problem is? cheers average (double a[], int n) { int i; double av = 0.0; for( i = 0; i < n; i++) { av += *a++; } return av; } main() { double a[]...
  4. spiderling66

    Preprocessor

    i got it thank you very much :)
  5. spiderling66

    Preprocessor

    anyone can help me, what does #define eg_H mean in the header file? and what action of preprocessor work on it? the sections of code can be inserted by #include, but in the output of the preprocessor, does output contain these two /* prog.c */ and # include "eg.h" ? the code is showing below...

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