QUESTION
How to reverse number in java ?
SOLUTION
import java.util.Scanner;
public class Main
{
public static void main(String args[])
{
int nbr, r = 0;
System.out.print(“Enter a number to reverse: “);
Scanner sc = new Scanner(System.in);
nbr = sc.nextInt();
while(nbr != 0)
{
r = r * 10;
r = r + nbr;
nbr = nbr/10;
}
System.out.println(“The reciprocal of the number is” + r);
}
}
QUESTION 2
Calculate the sum of even numbers ?
SOLUTION
import java.util.Scanner;
public class Main {
public static void main(String[] args)
{
int n, i, p = 0;
Scanner sc = new Scanner(System.in);
System.out.print(“enter a number : “);
n = sc.nextInt();
for(i = 1; i <= n; i++)
{
if(i % 2 == 0)
{
p = p + i;
}
}
System.out.println(“the sum of even numbers from 1 to “+n+” = “+p);
}
}
QUESTION
Test if a character is a letter ?
SOLUTION
public class Main {
public static void main(String[] args) {
char ch = ‘?’;
if((ch >= ‘A’ && ch = ‘a’ && ch <= 'z')){
System.out.println(ch + ” is a number.”);
}
else{
System.out.println(ch + ” is not a number.”);
}
}
}