Thread: line numbers

Hey guys i tried doin this but still dosnt work. What im actually trying to do is read the file line by line then list numbers next to each line then print it to standard out. Sorry for double posting unsure if anyone seen my reply

Code:

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv)
{

    int line_no = 1;
    int input_char;
    FILE *fp;

    if(argc !=2) /* check for 2 arguments*/
    {

      fprintf(stderr, "invalid usage :%s\n", argv[0]);
      return 1; /* stop processing if failes */

    }

    if((fp = fopen(argv[1], "r")) == NULL) 
    /* opens file for reading and checks if it exists */
    {
     
     fprintf(stderr, "invalid usage: %s\n", argv[0]);
     return 1; /* stop processing if fails*/

    }

          printf("dude\n");

    while(fscan(stdout, "%d", input_char)!=NULL)
    {


          fprintf(fp, "%s", input_char);
          line_no++;

    }

       
    

    fclose(fp);



    return EXIT_SUCCESS;

}

Try this

Code:

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv) {
    int line_no = 1;
    char line[256];
    FILE *fp;

    if(argc !=2) /* check for 2 arguments*/
    {
      fprintf(stderr, "invalid usage :%s\n", argv[0]);
      return 1; /* stop processing if failes */
    }

    if((fp = fopen(argv[1], "r")) == NULL) 
    /* opens file for reading and checks if it exists */
    {
     
      fprintf(stderr, "invalid usage: %s\n", argv[0]);
       return 1; /* stop processing if fails*/
    }
    while(fgets(line, 256, fp)!=NULL) {
          printf("%03d %s", line_no, line);
          line_no++;
    }

    fclose(fp);
    return EXIT_SUCCESS;
}

Kurt

Yehh i tried it that way and it seems to work but is there a way to read each line as an int and not as a char[256]. Because im giving this code as int input_char and unfortunately the guidlines say that i cant change the original variables to anything else.

maybe this way ?

Code:

    input_char = 0;
    int nl = 1;
    while(input_char !=EOF) {
          if ( nl ) {
             printf("\n%03d ", line_no);
             line_no++;
	  }
	  else 
	    putc(input_char, stdout);
	  input_char = getc(fp);   
	  nl = input_char == '\n';
    }

Kurt