Home »
C programs »
C preprocessors programs
Macro Arguments Evaluation in C
Macro Arguments Evaluation in C: Here, we will learn how Macro arguments evaluate in C programming language?
By IncludeHelp Last updated : March 10, 2024
We can define a function like Macro, in which we can pass the arguments. When a Macro is called, the Macro body expands or we can say Macro Call replaces with Macro Body.
Now, the important thing is that: How Macro arguments evaluate? - "Macro arguments do not evaluate before Macro expansion, they evaluate after the expansion."
Consider the example:
Example
#include <stdio.h>
#define CALC(X,Y) (X*Y)
int main()
{
printf("%d\n",CALC(1+2, 3+4));
return 0;
}
Output
11
Explanation
If you are thinking that 1+2 and 3+4 will be evaluated before the expansion and it will be expanded as 3*7 then, you are wrong.
The arguments evaluate after the call, thus Macro CALC(1+2,3+4) will be expanded as = (1+2*3+4) = (1+6+4) =(11).
Finally, the output will be 11.
C Preprocessors Programs »