command line arguments question

This is a discussion on command line arguments question within the C Programming forums, part of the General Programming Boards category; Hey guys im just playing around with this program which counts comments from source files such as .h or .c ...

  1. #1
    Musicman - Canora
    Join Date
    Aug 2005
    Location
    Melbourne
    Posts
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    command line arguments question

    Hey guys im just playing around with this program which counts comments from source files such as .h or .c files. How would i pass command Line Arguments when i run the program.

    Iv done some passing but it dosnt seem to work im not sure if im passing the arguments correctly when i run it?


    Code:
    #include <stdlib.h>
    #include <stdio.h>
    #include "myprogexam.h"
    #include <string.h>
    #include <ctype.h>
    
    #define TRUE  1
    #define FALSE 0
    
    int main(int argc, char **argv)
    {
       int numComments;
    
       if(argc !=2)
       {
          printf("not enough arguments passed!\n");
          return EXIT_FAILURE;
       }
       if(argc >3)
       {
          printf("Too many arguments:\n");
          exit(0);
       }
    
       numComments = displayComments(argv);
    
       return EXIT_SUCCESS;
    }
    
    int displayComments(char **argv)
    {
       
       FILE *fp; /* fp point to a file*/
       int currentChar, previousChar;
       int notYetCommentLine, blanksOnlySoFar;
       int numComments, i;
       
       char * suffix[] = {".h", ".c", NULL};
       char * filename;
    
       /* allocate dynamic space for the file*/
       
       filename  = malloc(sizeof(char) * (strlen(*argv) + 3));
        
       /* check if the filename exists*/
    
       if(!filename)
       {
         printf("Something went wrong!\n");
         return -1;
       }   
       printf("hello\n");
       /* count the comments in each file*/
       
       for(i=0; suffix[i]; i++)
       {
          strcpy(filename, *argv);
          strcat(filename, suffix[i]);
    
          fp = fopen(filename, "r");
    
          if(fp)
          {
             previousChar = '\0';
             blanksOnlySoFar = TRUE;
             notYetCommentLine = TRUE;
    
             while((currentChar=fgetc(fp)) !=EOF)
             {
                if(currentChar == '/' && previousChar == '/' &&
                   blanksOnlySoFar && notYetCommentLine)
                {
                    notYetCommentLine = FALSE;
                    numComments++;
                    putchar('/');
                }
                else if (currentChar == '\n')
                {
                    if(!notYetCommentLine) putchar('\n');
                    notYetCommentLine = TRUE;
                    blanksOnlySoFar = TRUE;
    
                }
                else if (!isspace(currentChar) && (currentChar != '/'))
                {
    
                    blanksOnlySoFar = FALSE;
                }
    
                if (!notYetCommentLine) putchar(currentChar);
                
                previousChar = currentChar;
    
             }
             fclose(fp);
          }     
    
       }
       free(filename);
       return numComments;
    
    }

  2. #2
    Registered User
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    California
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    How would i pass command Line Arguments when i run the program
    myprogram.exe <arg1> <arg2> <arg3> etc...

  3. #3
    Registered User ssharish2005's Avatar
    Join Date
    Sep 2005
    Location
    Cambridge, UK
    Posts
    1,682
    look, when u you say like this
    Code:
    strcpy(filename, *argv);
    u are basically reading the content of first argv[0] which is nothing but your on going file its self. if u understand buthib post

    myprogram.exe <arg1> <arg2> <arg3> etc...
    argv[0] [1] [2] [3]

    in your case if u say *argv its return u the same exe file rather than the parameter. the example program mighht explain u more

    Code:
    #include<stdio.h>
    
    int main(int argc,char  **argv)
    {
        printf("The no of argumenets %d\n",argc);
        
        printf("The argument that u reading : - %s\n",*argv);  // this is what u have done
        printf("The argumwnt that i have read : - %s %s\n",argv[0],argv[1]);
    
        getchar();
    }
    /*myoutput
    [d4088019@outcast ~/second]$ a.out hello.c
    The no of argumenets 2
    The argument that u reading : - a.out
    The argumwnt that i have read : - a.out hello.c
    */
    NOTE: no need of Strcat fucntion, b'cos u reading the file name with the extention itself

    ssharish2005

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