What do these errors mean?

silverneon · #1 30-Apr-2007, 07:23

Hi, I'm doing a small program. I'm supposed to write a function named trimfrnt() that deletes all leading blanks from a C-string. Write the function using pointers. The function returns nothing. When I run the program I get these errors.

CPP / C++ / C Code:

#include <iostream> 
using namespace std;

void trimfrnt(char *strng)		
{
  int i = 0;				
  int len = 0;  
  len = strlen(strng);   
  i = len - 1;
  while (*(strng + i) && *(strng + i) == ' ')
  i--;
  len = i + 1; 
  *(strng + len) = '\0';
  return;
}

CPP / C++ / C Code:

Undefined                       first referenced
 symbol                             in file
main                                /usr/local/lib/gcc-lib/sparc-sun-solaris2.8/3.3.6/crt1.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

Anyone know what this means and how to fix it?

davekw7x · #2 30-Apr-2007, 07:51

Quote:

Originally Posted by silverneon

Hi, I'm doing a small program. I'm supposed to write a function named trimfrnt() that deletes all leading blanks from a C-string. Write the function using pointers. The function returns nothing. When I run the program I get these errors.

Code:

Undefined                       first referenced
 symbol                             in file
main

Anyone know what this means and how to fix it?

It means that you don't have a main() function.

Fix it by writing a main() function.

In particular: To test your function write a main() function that calls trmfront() with an argument that is a C-string with leading spaces.

Regards,

Dave

Lurch · #3 30-Apr-2007, 08:10

The function you wrote trims the trailing spaces from the C string, not the leading ones, although the name (and also your description of the function) suggests otherwise.
Does the function really do what you intended ?

PS: Perhaps is not necessary to put a return statement exactly at the end of your function, as it returns void.

Best regards,
Lurch.

WaltP · #4 30-Apr-2007, 14:27

Quote:

Originally Posted by Lurch

PS: Perhaps is not necessary to put a return statement exactly at the end of your function, as it returns void.

Best regards,
Lurch.

Not necessary but recommended anyway. It's good practice not to rely on default actions when it doesn't take anything to be specific.

Gomez

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What do these errors mean?

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