pass by refrence help.

**Harman** · 05-11-2005

The function takes a string pointer and returns by refrence a string . I can print the string just fine in the function inself but when i try to print it from the main function it prints some junk. Can any body tell me why?? Pleaseeeeeeeeeeeeeeeeeeeeeeeeeeeeee

Code:

int validateInptFile(char *fPtr, char **seqNo){
char fileName[18], sNo[10];

strncpy(sNo, &fileName[9], 4);
sNo[4] = '\0';

*seqNo = &sNo[0];
printf("seqNo > %s\n", *seqNo);
//output "0001"
}


//function call from main

validateInptFile(newAddFile, &curSeqNo));
printf("MAIN > %s\n", curSeqNo);
//outputs some junk

**Thantos** · 05-11-2005

1) References don't exist in C. You are using a pointer to get to the data
2) You are trying to use a pointer to a local nonstatic variable that is destroyed after the function end

**swoopy** · 05-11-2005

Simpler is:

Code:

int validateInptFile(char *fPtr, char *seqNo){
   char fileName[18], sNo[10];

   strncpy(sNo, &fileName[9], 4);
   sNo[4] = '\0';

   strcpy(seqNo, sNo);
   printf("seqNo > %s\n", seqNo);
   //output "0001"
}

Or even simpler:

Code:

int validateInptFile(char *fPtr, char *seqNo){
   char fileName[18];

   strncpy(seqNo, &fileName[9], 4);
   seqNo[4] = '\0';

   printf("seqNo > %s\n", seqNo);
   //output "0001"
}

And then the call would be:

Code:

validateInptFile(newAddFile, curSeqNo));

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