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Convert string to to HEX

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Convert string to to HEX

Jul 5th, 2006

Hello

how would i go about converting a string value to HEX

ie

char name[10]="STEPHEN";

Convert name to HEX

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Re: Convert string to to HEX

Jul 5th, 2006

You can pass character by character to itoa with radix 16.
If you only want to display the hex values, you can use printf with format specifiers %x or %X.

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Re: Convert string to to HEX

Jul 5th, 2006

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Originally Posted by WolfPack

You can pass character by character to itoa with radix 16.
If you only want to display the hex values, you can use printf with format specifiers %x or %X.

I understand how to use the itoa function, but this radix 16?

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Re: Convert string to to HEX

Jul 5th, 2006

If you use the radix 10, you will get a string of the an integer in base 10.
For radix 16, you will get a hexadecimal string.
You can try the example in the given web page or the one below.
e.g

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main()
{
	char name[10]="stephen";
	char buffer[21]="";
	char *pbuffer = buffer;
	int len = strlen( name );
	for( int i = 0; i < len ;i++ )
	{
		itoa (name[i],pbuffer,16);
		pbuffer +=2;
	};
	printf( "%s\n", buffer );
    return 0;
}
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main()
{
	char name[10]="stephen";
	char buffer[21]="";
	char *pbuffer = buffer;
	int len = strlen( name );
	for( int i = 0; i < len ;i++ )
	{
		itoa (name[i],pbuffer,16);
		pbuffer +=2;
	};
	printf( "%s\n", buffer );
    return 0;
}

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Re: Convert string to to HEX

Jul 5th, 2006

When i try to compile, i get this

> gcc string_to_hex.c

Undefined first referenced
symbol in file
itoa /tmp/cc21JKaJ.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

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Re: Convert string to to HEX

Jul 5th, 2006

Looks like a linker error. Do you have this problem for my example only or for the example given in the link I posted also?

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Re: Convert string to to HEX

Jul 5th, 2006

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Originally Posted by WolfPack

Looks like a linker error. Do you have this problem for my example only or for the example given in the link I posted also?

I cant see no given web page, but i changed the code a little to make it as simple as possible with the same error

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Re: Convert string to to HEX

Jul 5th, 2006

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Originally Posted by sgriffiths

I cant see no given web page,

I mean this web page.

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Re: Convert string to to HEX

Jul 6th, 2006

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Originally Posted by sgriffiths

When i try to compile, i get this

> gcc string_to_hex.c

Undefined first referenced
symbol in file
itoa /tmp/cc21JKaJ.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

Yes of course itoa is nonstandard. U can implement your own itoa
http://www.daniweb.com/techtalkforum...highlight=itoa
or use this code

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
#include <stdio.h>
#include <string.h>
int main()
{
	char name[10]="STEPHEN";
	char buffer[21]="";
	char *pbuffer = buffer;
	int len = strlen( name );
	int i;
	for(i = 0; i < len ;i++ )
	{
		sprintf(pbuffer, "%x", name[i]);
		pbuffer +=2;
	}
	printf( "%s\n", buffer );
    return 0;
}
#include <stdio.h>
#include <string.h>
int main()
{
	char name[10]="STEPHEN";
	char buffer[21]="";
	char *pbuffer = buffer;
	int len = strlen( name );
	int i;
	for(i = 0; i < len ;i++ )
	{
		sprintf(pbuffer, "%x", name[i]);
		pbuffer +=2;
	}
	printf( "%s\n", buffer );
    return 0;
}

Compiled with gcc

Last edited by andor; Jul 6th, 2006 at 6:07 am.

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Re: Convert string to to HEX

#10

Jul 6th, 2006

What are you guys taking about? The original request is:

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Originally Posted by sgriffiths

how would i go about converting a string value to HEX
ie
char name[10]="STEPHEN";

Convert name to HEX

What does this mean?
1) "STEPHEN" is not a number so it can't be converted to Hex
or
2) "STEPHEN" is a string of characters that each have a Hex value. Do you mean add these characters to get a value?

Maybe an actual example would be in order. After the conversion, what should the Hex value of "STEPHEN" be?