convert Hexadecimal number in Octal in c

Question

I want a c program which ask for Hexadecimal number and gives output equivalent octal number. I use the code to convert int into octal using printf() function.

#include<stdio.h>
Void main(){
  int i;
  printf("Enter the Hax number: ");
  scanf("%x",&i);
  printf("Octal equivalent of number is %o",i);
}

`Void` could be `void`, then it would be valid C, but should be `int` — gbulmer, Apr 12 '12 at 14:34
@Max: Could it be you are a spammer or why does your profile link to an adsite? — Sebastian Mach, Apr 12 '12 at 14:51

Pavan Manjunath · Accepted Answer · 2012-04-13T03:01:50.217

1

Hexadecimal and Octal are just different representations of the same underlying number format. ie binary. So no conversion is really happening in your example. Its just that you are interpreting/printing the same number in 2 different ways. And printf is indeed doing a good job in your example

Enter the Hax number: FF
Octal equivalent of number is 377

The only other problematic thing I can see is Void main :)

edited Apr 13 '12 at 03:01

answered Apr 12 '12 at 14:31

Pavan Manjunath

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yes u r right but printf() does not convert the actual value i holds. I want to convert this value – Max Sep 04 '12 at 05:11

score 1 · Answer 2 · edited Apr 12 '12 at 14:50

1

other than your syntax errors this seems to be working, I just copied it. change

Void main()

to

int main()

or

//Since you are not using command line arguments this isn't necessary but valid
int main(int argc, char **argv)

and add a

return 0; //not necessary but good practice

at the end of the method

EDIT:

also

void main()

will compile with many C compilers, but is invalid C (no current and prior standard sanctions it). Use int instead.

edited Apr 12 '12 at 14:50

Sebastian Mach

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answered Apr 12 '12 at 14:32

twain249

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@Alok I just coded it and it compiles and runs fine. (There is a warning under gcc with the `-Wall` option specified but not otherwise) – twain249 Apr 12 '12 at 14:42
2

@twain249 - compiling is not enough to say if the code is valid C. The C standard defines what is valid C. http://stackoverflow.com/questions/636829/difference-between-void-main-and-int-main – Alok Singhal Apr 12 '12 at 14:45
@Alok and twain: I looked it up, I must apologize, void main() is indeed not sanctioned. +1 for mentioning that compiling is not enough. – Sebastian Mach Apr 12 '12 at 14:45
@Alok changed it from is valid to will compile and said not to use it. – twain249 Apr 12 '12 at 14:47
I remove my initial comment as I see it is voted up for untruth, sorry again. – Sebastian Mach Apr 12 '12 at 14:48
@twain249: I refined your phrase further. – Sebastian Mach Apr 12 '12 at 14:49

convert Hexadecimal number in Octal in c

2 Answers2