Question

Take the Java program Pretty.java and convert it to the equivalent C program. You can use the file in.txt as sample input for your program.

v  import java.io.*;
import java.util.*;

public class Pretty
{
  public static final int LINE_SIZE = 50;
  
  public static void main(String[] parms)
  {
    String inputLine;
    int position = 1;
    Scanner fileIn = new Scanner(System.in);

    while (fileIn.hasNextLine())
    {
      inputLine = fileIn.nextLine();

      if (inputLine.equals(""))
      {
        if (position > 1)
        {
          System.out.println();
        }
          
        System.out.println();
        position = 1;
      }
        
      else
      {
        if ((position+inputLine.length()-1) > LINE_SIZE)
        {
          System.out.println();
          position = 1;
        }
        System.out.print(inputLine);
          
        position += inputLine.length();
        if (position <= LINE_SIZE)
        {  // add a blank after the current word
          System.out.print(" ");
          position++;
        }
      }   
    }      
  }
}

Answer 1

Take input file as in.txt :

sknkbakbhbhkabbkbsbak nsjbnkjb  kabkhb bkebkb 

jwbkb wsb   hkws   bswb bkbse nkbs bekb bejkbk ebkhb jksebkjb bsekb hesbhb hbeshkb hbeskhb hksebvhkbsk esbhkb hbheb
jksbwb bkbk  kjbkjbk
sjkbkeb nejkbnkb jbekjb 
enkbk  kjebske  jbkwhebsk
kbshjb 
ebhbk 

C program :

#include <stdio.h>
#include <string.h>
#define LINE_SIZE 50

int main(int argc, char* argv[])
{
    FILE* file = fopen("in.txt", "r");   // reading the input file in.txt
    char line[1000000];                  // char array to store content in lines
    
    int position = 1;                    // set position to 1
    while (fgets(line, sizeof(line), file))  // runs while loop until all the content of file is read
    {
        if(strcmp(line,"")==0)           // if the line in a file is empty
        {
            if(position > 1)             // if position is greater than 1 print a new line
            {
                printf("\n");            
            }
            printf("\n");
            position =1;                 // set the position as 1
        }
        else                             // if line in a file is not empty
        {
            if((position + sizeof(line)-1) > LINE_SIZE)   // if condition is true
            {
                printf("\n");                            // print a new line 
                position = 1;                            // set position =1
            }
            printf("%s",line);                          // print the current line

            position += sizeof(line);                   // sizeof is used to calculate length of the line 
            if(position <= LINE_SIZE)
            {
                printf(" ");
                position++;
            }
        }
        
    }


    fclose(file);    // close the file 

    return 0;
}

Screenshot and Output :