[SOLVED] the o/p of given code comes out as 4 which i cnt intrpret..pls help..

mscoder · 07-21-2012, 09:20 AM

Code:

#include<stdio.h>
#define boo(x) x/4
main(){
int I;
I=64/boo(4);
printf("%d\n",I);
}

firstfire · 07-21-2012, 09:47 AM

Hi.

You forgot parentheses in the macro:

Code:

$ cat test.c
#include<stdio.h>
#define boo(x) x/4
main(){
int I;
I=64/boo(4);
printf("%d\n",I);
}
$ cpp test.c
.....
main(){
int I;
I=64/4/4;
printf("%d\n",I);
}

Division is left associative: 64/4/4 = (64/4)/4 = 16/4 = 4. The correct macro would be

Code:

#define boo(x) (x/4)

which gives 64/(4/4) = 64/1 = 64.