How to set c++ pointer to zero

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i have a data like this

C++

 char bufget[]="RE000022701500Ì200 0.00 6.113.937";

char preSendBuf[138];
int ptr=0;

int q=strlen(bufget);
for(int i=0;i<q;i++)
{
    while(*digits)
    {
    if((bufget[i]==*digits++))
    {
        preSendBuf[ptr]=bufget[i];
        ptr++;
//i know here we should decrement *digits index again to zero but how

    }
    }


}
preSendBuf[ptr]='\0';
ptr=0;
return 0;

actually data that i should get in

preSendBuf should be "RE000022701500200 0.00 6.113.937"

Posted 8-Nov-12 5:25am

Tarun Batra

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Red Chocolate 9-Nov-12 4:27am

What is digits here?

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Richard MacCutchan · Answer 1 · 2012-11-08T23:27:00

It appears that someone has deleted my comments from yesterday on this issue. I have suggested to you a number of times how to process these data records, by using the information provided by the manufacturer. Each record has a predefined structure allowing you to access individual fields and validate them against the data specification. Make use of that information rather than continually trying to invent complicated parsing rules and making your programs more difficult that they need to be.

Stefan_Lang · Answer 2 · 2012-11-08T23:50:00

You have omitted that information, but digits (initially) appears to be a 0-terminated array of "acceptable" characters.

You are abusing the symbol digits for iterating over that set of characters, thereby losing the reference to the start of this array. What you should do instead is introduce a helper variable for that particular purpose (i. e. iterating), e. g.:

C++

for (int i = 0; i < q; ++i) {
   char* pdigits = digits;
   while (*pdigits) {
      if (budget[i] == *pdigits++) {
         // ...
      }
   }
}

How to set c++ pointer to zero

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