I am not able to get it?

Question

#include<studio.h>
#define square(x) x*x
Int main()
{
printf("%d",square(4-1));
return 0
}

Answer is -1

How

Answer 1

#define square(x) x*x
square(4-1) = 4-1*4-1 = 4-4-1 = -1

#define square(x) (x)*(x)
square(4-1) = (4-1)*(4-1) = 9

Answer 2

https://www.sololearn.com/Discuss/1840359/?ref=app