error : type mismatch in redlaration of calcChksum

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C#

#include<stdio.h>
#include<conio.h>

int main(short argc, char** argv)
{

   unsigned char serNum [] = "DS0008D-0111A";
   unsigned char *ser = serNum;
   unsigned short checksum;
checksum = CalcChksum(*ser,13);
printf("the checksum is %x",checksum)  ;
return 0;
}


unsigned short CalcChksum(unsigned char *ptr,int bytecnt)
{
   int i;
   unsigned short chksum;

   chksum = 0;
   // Calculate 1's complement chksum
   for(i=0; i<bytecnt; i++)
   {
   chksum += (unsigned short)*ptr;
   chksum = (char)~chksum;
   }
   return(chksum);

}

Posted 16-Oct-14 21:12pm

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Legor 17-Oct-14 3:24am

Mind formulating a question?

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Fredrik Bornander · Answer 1 · 2014-10-16T21:44:00

First of all I think the method CalcChksum needs to appear above your main. Or you'll at least need to forward-declare it.

Other than that, calling CalcChksum like this;

C

unsigned char *ser = serNum;
checksum = CalcChksum(*ser,13);

Is incorrect, CalcChksum is declared like;

C

unsigned short CalcChksum(unsigned char *ptr, int bytecnt)

So the first parameter should be a char*, by putting as asterisk in front of ser you're de-referencing that from an unsigned char * to a unsigned char.
Change the call to

C

checksum = CalcChksum(ser,13);

Hope this helps,
Fredrik