char conversion problem

From: muser (charlie12345_at_hotmail.com)
Date: 12/17/03 

Date: 17 Dec 2003 10:08:51 -0800

is string converted to its integer equivalent by minusing it by 48?
the function is suppose to check the fifth digit of struct member
using the formula contained within the function.
The function isn't doing that at the moment, hence this post and the
querie above. string must be of type char.

bool checkdigitforcustomercode( char* string )
{

int weightingfactor = 5;
int checkdigit;
int remainder;
int check1;

for(int i =0; i < 5; ++i)
 check1 += (string[i] - 48) * weightingfactor;/* problem area */
weightingfactor --;

remainder = check1 % 11;

checkdigit = 11 - remainder;

for(i=4; i<=5; i++)
if(!string[i] == checkdigit)
return false;

if(checkdigit == 11){
checkdigit = 'X';
}
else
         if(checkdigit = 10){
  checkdigit = '0';
  }

return true;
}

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