How to remove syntex error from the followin code

[AHSANKATHIA]

#include<stdio.h>
#include<conio.h>
 
#define pr (int n) printf("%d",n);
 
void main(void)
{
 
int f;
 
scanf("%d",&f);
pr(f);
}
 

[donbock]

It helps if you tell us what syntax error you're getting.

You define macro pr as not having any parameters, but then you try to pass it a parameter when you call it.

• There can't be any spaces between the macro name and the open-parenthesis in the macro definition if you wish to define a macro that takes arguments.
• A macro is not a function, you don't specify the types of the macro arguments in the macro definition.

If we make those corrections to your code we get this:

#define pr(n) printf("%d",n);
void main(void)
{
  int f;
  scanf("%d",&f);
  pr(f);
}

Which after macro substitution turns into this:

void main(void)
{
  int f;
  scanf("%d",&f);
  printf("%d",f);;
}

Note the two semicolons on line 5. The first comes from the macro expansion, the second comes from your original source.

Consider what would happen here:

#define pr(n) printf("%d",n);
...
if (flag)
   pr(f);
else
   pr(g);

After macro substitution you get:

if (flag)
   printf("%d",f);;
else
   printf("%d",g);;

which is logically equivalent to

if (flag)
   printf("%d",f);
;
else
printf("%d",g);
;

It is considered bad form to include a command-terminating semicolon in a macro definition.

[AHSANKATHIA]

The error i get is "expression syntex error" when i call the macro in main function

[Banfa]

remove the space between pr and ( in the #define

[AHSANKATHIA]

I tried removing space between pr and ( in #define but it gives another error. When i call pr in main function then it gives an error that pr must have prototype.

[Banfa]

remove the int as well you can't type function like macro parameters