MacroDefineInline.cpp

#include <iostream>
#include <stdio.h>

#define FOO_Def
#define FOO_Def2 5
inline int foo1(int x)
{
    return x*5+8;
}
#define macro(x)  x* 5 + 8

#define FUN1(a,b) \
a=a*b;\
b +=1;\
a++;

//If override macro, will not compiler error. but will replace marco case last disappear
#define FUN2(a,b) \
{ a=a*b;\
  b +=1;\
  a++; }

int main(int argc, const char * argv[])
{

    printf("X=%d, X*5=%d]\n", macro(5+3), macro(6+1)*5);
    // it become 5+3*5+8  6+1*5+8*5
    printf("X=%d, X*5=%d]\n", foo1(5+3), foo1(6+1)*5);
    // it become (5+3)*5+8  ((6+1)*5+8)*5

    int x=1, y=1;
    for (int i=0; i<=5; i++)
        FUN1(x,y);
    printf("X=%d, Y=%d\n", x, y);
    //Be careful this case will become
    //
    //     for (int i=0; i<=5; i++)
    //      {    a=a*b; }
    //      b +=1;\
    
    for (int i=0; i<=5; i++)
        FUN1(x,y);

    printf("X=%d, Y=%d\n", x, y);
    
#ifdef FOO_Def
    printf ("FOOO\n");
#endif

#ifdef FOO_Def2
    printf ("FOOO\n");
#endif
    
    
    //if (0==FOO_Def) Compiler will error
    if (0==FOO_Def2)  //Need define value for value check.
        printf ("FOOO\n");
    return 0;
}