Thread: Please help me how to convert 2-d array to 1-d array in java :( here's the code

import java.io.*;
 public class Program2 {
 public static void print_array(int[][] numbers)
{
 
 for (int i=1; i<numbers.length; i++) {
 System.out.print("" + i + " |");
 for (int a=1; a<numbers[i].length; a++)
 System.out.print("\t" + numbers[i][a]);
 System.out.println(); }
 
}
 
public static void main(String[] args) throws IOException {
BufferedReader r = 
new BufferedReader (new InputStreamReader(System.in));
 
String yesno="u";
boolean isExit=false;
 
do{
 
String row, column;
int Columns = 0;
int Rows = 0;
System.out.print("\n");
System.out.print("ENTER A NUMBER : ");
row= r.readLine();
Rows= Integer.parseInt( row );
 
 
int values[][] = new int[Rows+1][Rows+1];
int [][] m = new int[Rows][];
for (int i=0; i < Rows; i++)
m[i] = new int[Rows];
for (int i=0; i < values.length; i++)
for (int a=0; a < values[i].length; a++)
values[i][a] = i*a;
System.out.print("\n");
for (int i=0; i < values.length; i++){
System.out.print(" " + i + " ");
}
System.out.println();
for (int i=0; i < values.length; i++){
System.out.print("" + "" + "---");
}
System.out.println();
print_array(values);
System.out.print("\n\n");
 
  System.out.println("Try again (press 1 if yes/press 2 if no)?");
	yesno = r.readLine();
 
		if(yesno.equalsIgnoreCase("1")) {
		    isExit=false;
		} else if(yesno.equalsIgnoreCase("2")) {
		    isExit=true;
		}	
 
		}while(!isExit);
		 System.out.print("Goodbye!");
 
 
 }
}

this is a multiplication table 2d array, can you convert it to 1d array? this is my problem.. i don't how to convert it to 1d array

Do you mean just take all the values and stick them in one array?

Get the total size of the 2D array by doing length*width

int[][] tda = new int[5][5];
int total = tda.length*tda[0].length;
int[] oda = new int[total];

Then iterate through and add.

int index = 0;
for(int[] a:tda) {
    for(int i:a) {
        oda[index] = i;
        index++;
    }
}

Sorry if I messed any syntax or logic up. I whipped that up on the spot, so it might have errors. Let me know and I will come back and fix it.

It should work though.