How to empty Char Array and reuse the same in C?

Question

I am trying to read a file. I want to read each line from the file and check if there are any spelling error in that line.

For that I have added condition that data from file will store in buffer until it gets a new line characher '\n'. And after getting this line I want to empty the buffer and re insert the values in that.

Code I am using for the same is as follows:

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

#define W_COUNT 23800
#define MAX_LEN 100

char *dict[W_COUNT];
char buffer[MAX_LEN];
int num_words;      //No of Words
char *statement[W_COUNT];
char buffer1[MAX_LEN];

void read_dictionary();
void file_read(char *);
void spell_check();
int word_search(char*);

int main(int argc, char*argv[]){
  int i;
  if(argc < 2){
    printf("Expected Filename.\n");
    exit(0);
  }
  read_dictionary();
  file_read(argv[1]);
//  spell_check();
}

void read_dictionary(){
  FILE *fd;
  int i = 0;
  fd = fopen("dictionary", "r");
  while ( fscanf(fd,"%s",buffer) != EOF)
    dict[i++] = strdup(buffer);
  num_words = i;
  fclose(fd);
}

void file_read(char *filename){
  FILE *fd;
  int i = 0;
  char c;
  fd = fopen(filename,"r");
  /*while ( fscanf(fd,"%s",buffer1) != EOF)
  {
    word[i++] = strdup(buffer1);
    printf("File : %s\n", buffer1);
  }*/
  while ( ( c = fgetc(fd)) != EOF )
  {
    buffer1[i++] = tolower(c);
    if ( c == '\n')
    {
      //printf("New Line\n");
      spell_check();
      buffer1[i] = 0;

    }
    //buffer1[i] = 0;
  }
  printf("Statement : %s\n", buffer1);
  fclose(fd);
}

void spell_check(){
  char *str;
  str = strtok(buffer1," .?,!-");
  while( str != NULL){
    if(!word_search(str))
    printf("%s Not found.\n",str);
    str = strtok(0," .?,!-");
  }
}

int word_search(char *word){

  int high, low, mid;
  high = num_words - 1;
  low = 0;
  int found = 0;

  while (found == 0){
    mid = (low + high) / 2;
    if(strcmp(word, dict[mid]) == 0)
    return 1;
    else if(strcmp(word,dict[mid]) < 0)
    high = mid - 1;
    else
    low = mid + 1;
    if ( low > high)
    return 0;
  }
}

Any suggestions will be appreciated. Thank you in advance.

you can assign a null character to the starting of the buffer. — user5443453
– user5443453, Commented Mar 26, 2016 at 3:54
I tried but not working. It only loop through the first line. — Rahul Gokani
– Rahul Gokani, Commented Mar 26, 2016 at 3:57
For each line reading you have to assign the value of i to 0. But you didn't do that. Then you have to to assign the null character to the buffer. — user5443453
– user5443453, Commented Mar 26, 2016 at 4:02

user5443453 · Accepted Answer · 2016-03-26 04:04:51Z

2

while ( ( c = fgetc(fd)) != EOF )
  {
    buffer1[i++] = tolower(c);
    if ( c == '\n')
    {
      //printf("New Line\n");
      spell_check();
      i = 0;
      buffer1[i] = 0;

    }
    //buffer1[i] = 0;
  }

For each line reading you have to assign the 0 to the i. After that you have to assign the null to the 0th position in the buffer. You can try the above code for loop it will work.

answered Mar 26, 2016 at 4:04

user5443453

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