============================MODULEY=======================================
|                                                                         |
|  The program examples' source codes have been arranged in the same      |
|  order that appeared in the Tutorial. This is unedited and unverified   |
|  compilation. Published as is basis for educational, reacretional and   |
|  brain teaser purposes. All trademarks, copyrights and IPs, wherever    |
|  exist, are the sole property of their respective owner and/or          |
|  holder. Any damage or loss by using the materials presented in this    |
|  tutorial is USER responsibility. Part or full distribution,            |
|  reproduction and modification is granted to any body.                  |
|     Copyright 2003-2005 © Tenouk, Inc. All rights reserved.		  |
|          Distributed through http://www.tenouk.com			        |
|        		                                                        |
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===========================================================================
Originally programs compiled using Borland C++. Examples compiled using
VC++/VC++ .Net and gcc or g++ are given at the end of every Module.
For example if you want to compile C++ codes using VC++/VC++ .Net, change
the header file accordingly.  Just need some modification for the header
files...:

-------------------------------------------------
#include <iostream.h>
//for system()
#include <stdlib.h>

...
{
C++ codes...
}
-------------------------------------------------
should be changed to:
-------------------------------------------------
#include <iostream>
//use C++ wrapper to call C functions from C++ programs...
#include <cstdlib>
using namespace std;

...
{
C++ codes...
}
-------------------------------------------------
In VC++/VC++ .Net the iostream.h (header with .h) is not valid anymore.
It should be C++ header, <iostream> so that it comply to the standard.
In older Borland C++ compiler this still works, but not proper any more...
and for standard C/C++ the portability should be no problem or better
you read Module23 at http://www.tenouk.com/Module23.html to get
the big picture...For C codes, they still C codes :o)
=========================================================================
==========================ONLY C Codes HERE==============================


//program & file names, myecho.exe
//compiled using Visual C++ .Net
#include <stdio.h>

//echo command-line argument
//using array of character pointers
int main(int argc, char *argv[])
{
	int i;
	for(i=1; i<argc; i++)
		printf("%s%s", argv[i],(i<argc-1)? " ":"");
	printf("\n");
	return 0;
}

--------------------------------------------------------------------------------

//program & file names, myecho.exe
//compiled using Visual C++ .Net
#include <stdio.h>

//another version of the myecho program,
//command-line argument
int main(int argc, char *argv[])
{
	while(--argc > 0)
		printf("%s%s",*++argv, (argc > 1) ? " ": "");
	printf("\n");
	return 0;
}

--------------------------------------------------------------------------------

//searchpattern.cpp, compiled using
//Visual C++ .Net
#include <stdio.h>
//maximum input line length
#define MAXLINE 100

//Function prototypes...
int getline(char line[], int max);
int strindex(char source[], char searchfor[]);

//pattern to be searched for in the line
char pattern[] = "eat";

//find/display all line matching pattern
int main()
{
	char line[MAXLINE];
	int found = 0;
	
	printf("Searching \'eat\' in the line of text\n");
	printf("Enter line of text:\n");
	while(getline(line, MAXLINE) > 0)
		if(strindex(line, pattern) >= 0)
		{	printf("%s", line);
			found++;
}
		return found;
}

//getline, get line into string str, return the length
int getline(char str[], int lim)
{
int count, i;
i=0;

while(--lim > 0 && (count=getchar()) != EOF && count != '\n')
		str[i++] = count;
	if(count=='\n')
		str[i++] = count;
	str[i]='\0';
	return i;
}
//strindex, return index of t in str, -1 if none
int strindex(char str[], char t[])
{
	int i, j, k;
	for(i=0;str[i]!='\0';i++)
	{
		for(j=i, k=0; t[k] != '\0' && str[j] == t[k]; j++, k++)
			;
		if(k > 0 && t[k] == '\0')
			return i;
	}
	return -1;
}

--------------------------------------------------------------------------------

//searchpattern.cpp, compiled using VC++ .Net
//not usable...just program skeleton
#include <stdio.h>
#include <string.h>
#define MAXLINE 100

int getline(char *line, int max)
{
printf("In getline() function\n");
//put getting line of text codes here…
return 0;}

//find and print lines that match pattern 
//from the 1st argument
int main(int argc, char *argv[])
{
	char line[MAXLINE];
	int found = 0;

	//If just program name (argc = 1), then...
	if(argc != 2)
		printf("Usage: searchpattern thepattern\n");
	
	//If the program name with switch/option (argc = 2), then...
	else
		
               while(getline(line, MAXLINE) > 0)
               {
			if(strstr(line, argv[1]) != NULL)
			{printf("%s", line);
				found++;}
               }
	         return found;
              
}

--------------------------------------------------------------------------------

//searchpattern.cpp, compiled using VC++ .Net
#include <stdio.h>
#include <string.h>
#define MAXLINE 100

int getline(char *line, int max)
{
int count, i;
i=0;

while(--max > 0 && (count=getchar()) != EOF && count != '\n')
		line[i++] = count;
	if(count=='\n')
		line[i++] = count;
	line[i]='\0';
	return i;
}

//find and print lines that match the 
//pattern from the 1st argument
int main(int argc, char *argv[])
{
	char line[MAXLINE];
	int found = 0;

	//If just program name (argc = 1), then...
	if(argc != 2)
		printf("Usage: searchpattern thepattern\n");
	
	//If the program name with switch/option (argc = 2), then...
	else
	
       while(getline(line, MAXLINE) > 0)
       {
		if(strstr(line, argv[1]) != NULL)
		{
                printf("%s", line);
		   found++;
              }
         }
	 return found;
      
}

--------------------------------------------------------------------------------

//searchpattern.cpp, compiled using
//VC++ .Net
#include <stdio.h>
#include <string.h>
//maximum input line length
#define MAXLINE 100

int getline(char line[], int max)
{
int count, i;
i=0;

while(--max > 0 && (count=getchar()) != EOF && count != '\n')
		line[i++] = count;
	if(count=='\n')
		line[i++] = count;
	line[i]='\0';
	return i;
}

//find all line of text matching pattern
//supplied by command line argument
int main(int argc, char *argv[])
{
	char line[MAXLINE];
	long linenum = 0;
	int theoption, except = 0, number = 0, found =0;

	//check the minus sign....
	while(--argc > 0 && (*++argv)[0] == '-')
		//check the option...
		while(theoption = *++argv[0])
			switch (theoption)
		{
			case 'v':
				except = 1;
				break;
			case 'n':
				number = 1;
				break;
			default:
				printf("searchpattern: illegal option %s\n",theoption);
				argc = 0;
				found = -1;
				break;
		}
		//
		if(argc != 1)
		{
			//some help...
			printf("Usage: searchpattern -v -n thepattern\n");
			printf("Try: searchpattern -v -n test\n");
			printf("Try: searchpattern -v test\n");
			printf("Try: searchpattern -n test\n");
			printf("Try: searchpattern -vn test\n");
			printf("Then enter line of text, with or w/o the pattern!\n");
		}
		//
		else
			while(getline(line, MAXLINE) > 0)
			{
				linenum++;
				if((strstr(line,*argv) != NULL) != except)
				{
					if(number)
						printf("%ld:", linenum);
					printf("%s", line);
					found++;
				}
			}
			return found;
}

---------------------------------------------------------------------------------------------------

//main()arguments program example
//C++ codes
#include <iostream>
//For Borland 5.02 you may use <string.h> instead of <cstring>
//and comment out the ‘using namespace std’;
#include <cstring>
using namespace std;

int main(int argc, char *argv[], char *envp[])
{
//The default is no line numbers. 
int LineNum = 0;    

//If /n is passed to the .exe program, display
//numbered listing of environment variables.
//If program name and switch/option... AND stricmp...
if((argc == 2) && stricmp(argv[1], "/n" ) == 0)
LineNum = 1;
else
cout<<"no \'/n\' passed..."<<endl;

//Walk through list of strings until a NULL is encountered.
for(int i = 0; envp[i] != NULL; ++i)
{
if(LineNum)
cout<<i<<": "<<envp[i]<<"\n";
}
cout<<"Usage: searchpattern /n\n";
return 0;
}

---------------------------------------------------------------------------------------------------

//searchpattern.cpp
//compiled using VC++ .Net and Borland C++ 5.02
//run on windows machine...
#include <stdio.h>
//For VC++ .Net, comment out the above #include <stdio.h>
//and uncomment the following…
//include <cstdio>
//using namespace std;

int main(int argc, /*Number of strings in array argv*/
char *argv[],      /*Array of command-line argument strings*/
char **envp)       /*Array of environment variable strings*/
{
    int count;

    /*Display each command-line argument.*/
    printf("\nThe command-line arguments:\n");
    for(count = 0; count < argc; count++)
        printf("  argv[%d]   %s\n", count, argv[count]);

    /*Display each environment variable.*/
    printf("\nEnvironment variables:\n");
    while(*envp != NULL)
        printf("  %s\n", *(envp++));

    return 0;
}

--------------------------------------------GCC------------------------------------------------------

/***************cmdline.c****************/
/***********Run on FeDorA 3 Machine********/
#include <stdio.h>
/*For C++ compiler, comment out the above #include <stdio.h>*/
/*and uncomment the following.*/
/*include <cstdio>*/
/*using namespace std;*/

int main(int argc, /*Number of strings in array argv*/
char *argv[],      /*Array of command-line argument strings*/
char **envp)       /*Array of environment variable strings*/
{
    int count;

    /*Display each command-line argument.*/
    printf("\nThe command-line arguments:\n");
    for(count = 0; count < argc; count++)
        printf("  argv[%d]   %s\n", count, argv[count]);

    /*Display each environment variable.*/
    printf("\nEnvironment variables:\n");
    while(*envp != NULL)
        printf("  %s\n", *(envp++));

    

======================================================================================