C Programming - Declarations and Initializations - Discussion

Discussion Forum : Declarations and Initializations - Find Output of Program (Q.No. 4)

Declarations and Initializations

What is the output of the program in Turbo C (in DOS 16-bit OS)?

#include<stdio.h>
int main()
{
    char *s1;
    char far *s2;
    char huge *s3;
    printf("%d, %d, %d\n", sizeof(s1), sizeof(s2), sizeof(s3));
    return 0;
}

2, 4, 6

4, 4, 2

2, 4, 4

2, 2, 2

Answer: Option

Explanation:

Any pointer size is 2 bytes. (only 16-bit offset)
So, char *s1 = 2 bytes.
So, char far *s2; = 4 bytes.
So, char huge *s3; = 4 bytes.
A far, huge pointer has two parts: a 16-bit segment value and a 16-bit offset value.

Since C is a compiler dependent language, it may give different output in other platforms. The above program works fine in Windows (TurboC), but error in Linux (GCC Compiler).

Discussion:

55 comments Page 3 of 6.

Sapna yadav said: 1 decade ago

How it will print 2,4,4 for pointer it will take 2 byte but for these two lines,

char far *s2;
char huge *s3;

Can anyone explain me??

Amit said: 1 decade ago

Please explain the differences between the exit(0); and exit(1);and also the difference between the return(0); and return(1);.

Prashant said: 1 decade ago

@Sundar

We are talking about sizeof(char) not a sizeof(int)....!!!!

How come it can be 4 rather than becoming 1 or 2...?

Reema said: 1 decade ago

I dont know what is far and huge. Can you explain ?

And what do you mean by 16-bit offset and 16-bit segment value ?.

Yuvasree said: 8 years ago

I am getting error in 32bit Linux compiler, s2 and s3 was declared. Why I'm getting this error in 32 bit compiler?

Shri Hari Rajeswar said: 5 years ago

Can you please explain how you said like this? because pointer holds same bytes irrespective of the base you use.

Rahul Manjramkar said: 9 years ago

What is the far and huge?

And this code is error can't show output, so please explain in detail program also.

Reddy said: 1 decade ago

How they are using "*" symbol for variable declaration? i.e. *s1, *s2 n *s3

Any one answer me?

Sam said: 1 decade ago

What is DOS 16 bit OS ? Where we are using this ? If some other versions present what are they ?

Suhas said: 1 decade ago

Guys I'm confuse between the huge and far pointer. Can anybody explain me please?

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