Good afternoon, I would like to know if in C you have to do the following macro definition:
#define EXEMPLO(1) a * c + b
#define EXEMPLO(2) a + b + c
#define EXEMPLO(3) b * c + a
And then use indexing in some code for example
for (x=1,x<4,x++)
{
EXEMPLO(x);
}
You can write your macro using ternary operators:
#define EXEMPLO(idx) ((idx==1)?(a * c + b):((idx==2)?(a + b + c):((idx==3)?(b * c + a):0)))
Here is an example of how to use it:
#include <stdio.h>
#define EXEMPLO(idx) ((idx==1)?(a * c + b):((idx==2)?(a + b + c):((idx==3)?(b * c + a):0)))
int main( int argc, char ** argv )
{
int n = 0;
int i = 0;
int a = 3;
int b = 5;
int c = 7;
for( i = 1; i < 4; i++ )
{
n = EXEMPLO(i);
printf("idx=%d n=%d\n", i, n );
}
return 0;
}
Output:
idx=1 n=26
idx=2 n=15
idx=3 n=38