Counting duplicate chars in C Post: 302416102

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Top Forums Programming Counting duplicate chars in C Post 302416102 by DavoMan on Sunday 25th of April 2010 02:29:15 AM

04-25-2010

Registered User

Counting duplicate chars in C

Hi, im trying to create a C program that will count the number of characters, duplicate characters and non duplicate characters in a file and output this to the screen. Here is my code so far:

Code:

#include <stdio.h>

int main( void )

{
char c;
int duplicate = 0;
int nonduplicate = 0;
int count = 0;
char lastChar;

while ( (c = getchar()) != EOF)
       count ++;
       lastChar += c;
{
  if(c = lastChar)
    duplicate ++;
  else( duplicate == duplicate);
}

nonduplicate = (count - duplicate);
printf( "%d %d %d \n", count, duplicate, nonduplicate );

}

This outputs the answer: 67 1 66

It is counting the total characters correctly, but the number i have for my particular test file is 6 duplicates, so i need the answer to display 67 6 61, my main problem is i cant seem to be able to store the last read character so it can find out if the next char is the same. Im probably leaving/forgetting something simple here.
Any help would be appreciated.

DavoMan

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LEARN ABOUT SUSE

wcsdup

WCSDUP(3)						     Linux Programmer's Manual							 WCSDUP(3)

NAME

       wcsdup - duplicate a wide-character string

SYNOPSIS

       #define _GNU_SOURCE
       #include <wchar.h>

       wchar_t *wcsdup(const wchar_t *s);

DESCRIPTION

       The  wcsdup()  function	is  the wide-character equivalent of the strdup(3) function.  It allocates and returns a new wide-character string
       whose initial contents is a duplicate of the wide-character string pointed to by s.

       Memory for the new wide-character string is obtained with malloc(3), and should be freed with free(3).

RETURN VALUE

       The wcsdup() function returns a pointer to the new wide-character string, or NULL if sufficient memory was not available.

ERRORS

       ENOMEM Insufficient memory available to allocate duplicate string.

CONFORMING TO

       POSIX.1-2008.  This function is not specified in POSIX.1-2001, and is not widely available on other systems.

SEE ALSO

       strdup(3), wcscpy(3), feature_test_macros(7)

COLOPHON

       This page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2009-02-04								 WCSDUP(3)

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