beginner help

[cprog12]

Hi, I've tried and tried to make my own hex to decimal (myhtoi) function but am not succeeding
here's what I've got so far:

// a program to convert hex code into its equivalent decimal value

// myhtoi.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>

int myhtoi(char string[]);          // prototype of function (myhtoi)

int main(void)
{
	char hex[] = "0x00000110";         // declare string of hex digits
	myhtoi(hex);                       // call the function (myhtoi)
	return 0;                          // exit program
}

int myhtoi(char string[])        // now make the function (myhtoi)
{
	int i, n;           // used for counting and holding the value later
	n = 0;              // set the default value of n
	
	for (i = 2; string[i] >= '0' && string[i] <= '9'; i++)       // loop until condition is met
	{
		
	}
	
	printf("That hex code in decimal is %d\n", n);
	return 0;
}

I've tried:

n = 16 * n + (string[i] - '0');

but it only works for 1 digit only.
can anyone help me?
Thanks.

[tabstop]

Why do you claim that it only works for 1 digit only? And what happens when you try to convert "0xA"?

[cprog12]

because i've already tried it, it works for 0x00000010 and results in 16 but when i try 0x00000110 which should result in 48
it gives a very wierd result.
and i want to get 0-9 out of the way first before i want to deal with a-f.

[quzah]

I think he means that: 0x11 the first gets converted, and promptly discarded when he tries to convert the next.

He needs to be combining the previous number with the next. Like if I had a string "11" and I wanted to convert it to a decimal, I convert the first (right most) 1 to an actual 1, then I need to do the next one, and add that ten to the first one to get eleven.


Quzah.

[tabstop]

0x00000110 is surely not 48! 0x000000030 is 48. 0x00000110 is 256+16 = 272.

[cprog12]

lol you're right i'm abit rusty i've been doin 16 * 2 forgot it was 16 to the power of 2 sorry, i will try my code again

[cprog12]

ha it works sorry for wasting your time.