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


int hex(String hexzahl)
{
	int dec_sum=0, i=0, length=0, dec;
	
	length = strlen(hexzahl);	
	length--;
	
	for ( ; length >= 0 ; length--)
	{
    	switch(hexzahl[length])
		{
			case '0': dec=0; break;
			case '1': dec=1; break;
			case '2': dec=2; break;
			case '3': dec=3; break;
			case '4': dec=4; break;
			case '5': dec=5; break;
			case '6': dec=6; break;
			case '7': dec=7; break;
			case '8': dec=8; break;
			case '9': dec=9; break;
			case 'A': dec=10; break;
			case 'B': dec=11; break;
			case 'C': dec=12; break;
			case 'D': dec=13; break;
			case 'E': dec=14; break;
			case 'F': dec=15; break;
			default:  break;
		}
		
		dec_sum+=dec*(16^i);
		i++;
 	}
 	
 	
//	printf("\nDecimal: %d", dec_sum);
	return dec_sum;

} 

quote:

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hex(string)
The hex(string) function returns the base 10 equivalent to the hexadecimal value represented by the given string. The maximum number of hex characters in the given string is 4.

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