what is the output of this code and how??

Question

#include<studio.h>
#define square (x) x*x
void main()
{int i=28/square(4));
printf("%d",i);
}

Answer 1

Nariman Tajari
♤Correction...................
▪︎#include <stdio.h>

♤Important Suggestions......
-- be aware with the use of macros , The preprocessor doesn't know C/C++ ,it does just a simple substitution.
For ex.
#define MAX 100

The preprocessor will first remove the #define statement from the code, then it goes through the program and replace the all MAX with 100,
Now the processed file is sent to the compiler.

For ex.
#define SQUARE(a) a*a
.........
result = SQUARE(5); // Expect 25
result = 5*5; // Get 25

result = 100/SQUARE(5); // Expect 4
result = 100/5*5; //Get 100, not expec
//simple subs👆titution

So now you see, you get the idea , why should we avoid to use macros in our code.

*use const instead of #define

Answer 2

Inumaki

It is simple Macro is a piece of code which is replaced by the value of macro.

So if square (x) = x * x
Then square (4) = 4 * 4

If square (x) = (x * x)
Then square (4) = (4 * 4)

Answer 3

Nariman Tajari

int i = 28 / square(4)

Since there is no parenthesis in defined macros like this (x * x)

So calculation would be like this:

i = 28 / 4 * 4;
i = (28/4) * 4
i = 28

If there is (x * x)

Then i = 28 / (4 * 4) = 1

Answer 4

A͢J yeah thanks 👌🙌

Answer 5

A͢J ah u are correct when i was running his code and fixing those typo and brackets i actually put parenthesis on macros i forgot that he didn't put them

looks like i have to downvote my own answer lol

thanks for clarifying

Answer 6

thanks A͢J and ROOKIE for insighitful points and also Inumaki .

Answer 7

Nariman Tajari yeah to get the expected o/p ,
Look at A͢J comment.
Also keep in mind that i have suggested.

Thanks...

Answer 8

#include<stdio.h> // Not studio.h
#define square (x) x*x
void main()
{
int i=28/square(4);
/* Basically it works as:
i=28/4*4;
i=7*4;
i=28; */
printf("%d",i);
}

And the output of this code is 28.

Answer 9

BODMAS RULE APPLIES :
==>28/7*4
==(28/7)*4 [Division precedes multiplication]
=4*4=16

if the definition were (4*4) with parentheses, then the results would be different

Answer 10

nayoR

Notepad++ is used to edit html and don't ask question in others question.

Answer 11

Answer is 28

square(4) = 4*4

i = 28 / 4 * 4

as division has higher precedence order therefore

i = (28/4)*4

i = 7*4

i = 28

Answer 12

BODMAS - Brackets Off Division Multiplication Addition Subtraction..

Answer is 28 / 4 * 4 = 7 * 4 = 28 (L - R)

Answer 13

> "studio" i guess you got typo its "stdio"
> you got an extra bracket after (4)

After resolving them
> Output should be 1 with warning return type of 'main' is not `int'

> output [ redacted] #see A͢J 's answer I actually messed up here :'')

> Warning will be there because compiler telling you main() must return int

Answer 14

1

Answer 15

28...!!!

Answer 16

I'm new here so I'm just going to watch and learn

Answer 17

what type of editor is used to html code

Answer 18

square(4) =4*4=16 from define
i=28/16
Ans is 1