ForLoop.java

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

public class ForLoop {

    public boolean isPrime(int n) {
	int test = n-1;
	for (test = n-1;test > 1;test--) {
	    if (n%test==0)
		return false;
	}
	return true;
    }

    public String reverse(String s) {
	int length = s.length();
	String result = "";
	for(int i = length -1; i>=0; i--)
	    result = result + s.substring(i, i+1);
	return result;
    }

    public String table(int n, int m) {
	String result = "";

	for(int i=1; i<=n; i++) {
	    result = result + i+ " ";
	}

	result = result + "\n";

	for (int k=1; k<=m; k++) {
	    result = result + k + " ";

	    for (int j=1;j<=n;j++) {
		result = result + (j*k) + " ";
	    }
	    result = result + "\n";
	}
	return result;
	} 
}