Table Of Contents
- 1. Write a Java code for find a positive or Negative Number
- 2. Write a Java code to print the absolute value of num
- 3. Write a Java code for find a odd or even Number
- 4. Write a Java code for swap of 2 numbers
- 5. Write a Java code for sum of natural numbers
- 6. Write a java Code for Sum of natural numbers – another method
- 7. Write a java Code for Factor of a Number
- 8. Write a java Code for Split Numbers Into Digits
- 9. Write a java Code for Sum of Digits
- 10. Write a java Code Reverse a Number
- 11. Write a java Code for Palindrome Number
- 12. Write a java Code for Armstrong Number
- 13. Write a java Code for Fibonacci Series
- 14. Write a java Code for Prime Number
- 15. Write a java Code for Perfect Number
1. Write a Java code for find a positive or Negative Number
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
//Write your code here
if(num < 0)
System.out.println("Negative");
else if(num > 0)
System.out.println("Positive");
else
System.out.println("Neither positive nor negative");
}2. Write a Java code to print the absolute value of num
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
//Write your code here
if(num < 0)
num = -num;
System.out.println(num);
}3. Write a Java code for find a odd or even Number
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
//Write your code here
if(num % 2 == 0)
System.out.println("Even");
else
System.out.println("Odd");
}4. Write a Java code for swap of 2 numbers
public static void main(String[] args) {
int a, b;
Scanner sc = new Scanner(System.in);
a = sc.nextInt();
b = sc.nextInt();
//Write your code here
int temp;
temp = a;
a = b;
b = temp;
System.out.println(a + " " + b);
}5. Write a Java code for sum of natural numbers
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int N = sc.nextInt();
//Write your code here
int sum = 0;
for(int i = 1; i <= N; i++)
sum += i;
System.out.println(sum);
}6. Write a java Code for Sum of natural numbers – another method
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int N = sc.nextInt();
//Write your code here
int sum = 0;
sum = (N * (N + 1)) / 2;
System.out.println(sum);
}7. Write a java Code for Factor of a Number
public static void main(String[] args) {
int N, X;
Scanner sc = new Scanner(System.in);
N = sc.nextInt();
X = sc.nextInt();
//Write your code here
if(N % X == 0)
System.out.println("Yes");
else
System.out.println("No");
}8. Write a java Code for Split Numbers Into Digits
public static void main(String[] args) {
int num;
Scanner sc = new Scanner(System.in);
num = sc.nextInt();
//Write your code here
while(num > 0)
{
int mod = num % 10;
System.out.print(mod + " ");
num = num / 10;
}
}9. Write a java Code for Sum of Digits
public static void main(String[] args) {
int num;
Scanner sc = new Scanner(System.in);
num = sc.nextInt();
//Write your code here
int sum = 0;
while(num > 0)
{
int mod = num % 10;
sum = sum + mod;
num = num / 10;
}
System.out.println(sum);
}10. Write a java Code Reverse a Number
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
//Write your code here
int ans = 0;
while(num > 0)
{
int mod = num % 10;
ans = ans * 10 + mod;
num = num / 10;
}
System.out.println(ans);
}11. Write a java Code for Palindrome Number
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
//Write your code here
int temp, ans = 0;
temp = num;
while(num > 0)
{
int mod = num % 10;
ans = ans * 10 + mod;
num = num / 10;
}
if(ans == temp)
System.out.println("Palindrome");
else
System.out.println("Not Palindrome");
}12. Write a java Code for Armstrong Number
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
//Write your code here
int temp, result = 0;
temp = num;
while(num > 0)
{
int mod = num % 10;
result = result + mod * mod * mod;
num = num / 10;
}
if(temp == result)
System.out.println("Armstrong number");
else
System.out.println("Not Armstrong number");
}13. Write a java Code for Fibonacci Series
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
//Write your code here
int a = 0, b = 1, c;
for (int i = 1; i <= n; i++)
{
System.out.println(a + " ");
c = a + b;
a = b;
b = c;
}
}14. Write a java Code for Prime Number
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
//Write your code here
int flag = 0;
for(int i = 2; i < num; i++)
{
if(num % i == 0)
{
flag = 1;
break;
}
}
if(flag == 0)
System.out.println("Prime number");
else
System.out.println("Not Prime number");
}15. Write a java Code for Perfect Number
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
//Write your code here
int result = 1;
for(int i = 2; i <= Math.sqrt(n); i++)
{
if(n % i == 0)
{
if(n / i == i)
result = result + i;
else
result = result + i + n / i;
}
}
if(n == result)
System.out.println("Yes");
else
System.out.println("No");
}