reversing the strings in different ways ?

SUNIL GUTTA

13y1.5kJava

Well thing is i have a file which contains data . so program should take that file as i/p and need to reverse the words in the fallowing manner and store it back

Please look at the exact requirement ..

Write a Java program that reads in lines of text from a file then prints out the text with different transformations around the vertical, horizontal, and diagonal axis. The program will accomplish this by reading in the text as a rectangular block of data into a 2D array of characters (char[][]). The program will create only one 2D array and will not copy from one array to another. The dimensions of the 2D array will be contained in the first line of the input file, row first and then columns.

This is whats contained in the file:

4 4
JAVA
PROG
NUMB
FOUR

Apparently, the first 2 integer are there to tell us the row and columns according to our professor. so all we need to transform is the four words below that. And i have trouble reading Characters into the 2D array and tranform them around the vertical horizontal and diagonal axis.

The output supposed to be like this:

AVAJ
GORP
BMUN
RUOF

FOUR
NUMB
PROG
JAVA

RBGA
UMOV
OURA
FNPJ

I know how to code & get the o/p of first two o/p scenarios .. but 3rd one i have no clue and finally how to store the entire results back ..

cheers ty

3 Replies

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Vulpes13y ago
Accepted answer
The following writes the transformed arrays to a file using PrintWriter:

// Transform.java

import java.io.*;

class Transform
{
public static void main(String[] args) throws IOException
{
FileInputStream input = new FileInputStream("input.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(input));
PrintWriter pw = new PrintWriter("output.txt");
String line;
String[] split;
char[] chars;
int x, y;

try
{
line = br.readLine();
split = line.split(" ");
x = Integer.parseInt(split[0]);
y = Integer.parseInt(split[1]);
char[][] data = new char[x][y];

for(int i = 0; i < x; i++)
{
line = br.readLine();
chars = line.toCharArray();
for(int j = 0; j < y; j++) data[i][j] = chars[j];
}

char[][] data2 = copyArray(data, x, y);

for(int i = 0; i < x; i++)
{
for(int j = 0; j < y; j++)
{
data2[i][j] = data[i][y - 1 - j];
}
}

printArray(data2, x, y, pw);

for(int i = 0; i < x; i++)
{
for(int j = 0; j < y; j++)
{
data2[i][j] = data[x - 1 - i][j];
}
}

printArray(data2, x, y, pw);

for(int i = 0; i < y; i++)
{
for(int j = y - 1; j >= 0; j--)
{
data2[x - 1 - i][j] = data[y - 1 - j][i];
}
}

printArray(data2, x, y, pw);
}
catch(IOException e)
{
System.out.println(e);
return;
}
finally
{
br.close();
input.close();
pw.close();
}
}

static char[][] copyArray(char[][] orig, int x, int y)
{
char[][] copy = new char[x][y];

for(int i = 0; i < x; i++)
{
for(int j = 0; j < y; j++)
{
copy[i][j] = orig[i][j];
}
}

return copy;
}

static void printArray(char[][] data, int x, int y, PrintWriter pw)
{
for(int i = 0; i < x; i++)
{
for(int j = 0; j < y; j++)
{
pw.print(data[i][j]);
}
pw.println();
}

pw.println();
}
}
SUNIL GUTTA13y ago
Ty for response ty .. well it helped .. but hot to do by reading those strings from file and doing operations .. cheers .. just givvve how to get and save the o/p to file .. in b/w logic of these 3 ways of reversing things i can handle i guess .

Ty for such quick response
cheers
Ty
John McFlurfin13y ago
For the third block...

The first line is the last char of each word and then so on. So you would do something like

void method()
{
        string java = "JAVA";
        string four = "FOUR";
        string prog = "PROG";
        string numb = "NUMB";

        System.out.println(four.charAt(3) + numb.charAt(3) + prog.charAt(3) + java.charAt(3));
        System.out.println(four.charAt(2) + numb.charAt(2) + prog.charAt(3) + java.charAt(2));
        System.out.println(four.charAt(1) + numb.charAt(1) + prog.charAt(3) + java.charAt(1));
        System.out.println(four.charAt(0) + numb.charAt(0) + prog.charAt(3) + java.charAt(0));
}