1. Create a program to add two numbers.
public class Addition {
public static void main(String[] args) {
// TODO Auto-generated method stub
int a = 10 , b = 20;
int c = a + b;
System.out.println("Addition = "+c);
}
}
2. Program to calculate Area of circle.
/*Java Program to Calculate the Area of a Circle
* By Rahul Kundu
* Area of a Circle, A = π r², where, π (pie) is equal to the fraction 22/7 and r stands for radius.
*
*/
import java.util.Scanner;
public class AreaCircle {
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
System.out.println("Enter the radius of the circle : ");
float radius = sc.nextFloat();
float area = (22.0f/7.0f) * radius * radius;
System.out.println("Area of the Circle is "+ area +" sq. units");
}
}
3. Program to check Armstrong Number.
/*Java Program to Check Armstrong Number
* By Rahul Kundu
* For example, 0, 1, 153, 370, 371, and 407 are some Armstrong numbers.
*/
import java.util.Scanner;
public class Armstrong {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc = new Scanner(System.in);
System.out.println("Enter the number : ");
int number = sc.nextInt();
if(number == 0 || number == 1){
System.out.println(""+number+" is an Armstrong Number !");
return;
}
int num = number; // preserving the original number
int sum = 0;
while(num > 0){
int digit = num % 10;
//sum += Math.pow(digit,3);
sum = sum + (digit * digit * digit);
num = num / 10;
}
if(sum == number){
System.out.println(""+number+" is an Armstrong Number !");
}else{
System.out.println(""+number+" is NOT an Armstrong Number !");
}
}
}
4. Program to find Average of total marks.
public class Average {
public static void main(String[] args) {
// TODO Auto-generated method stub
int p = 75 , c = 80 , m = 78;
double avg;
double total = p+c+m;
System.out.println("Total= "+total);
avg = total / 300;
System.out.println("Average = "+avg);
double percentage = avg * 100;
System.out.println("Percentage = "+percentage);
}
}
5. Program to calculate Average of N number:
import java.util.Scanner;
/*Java Program to Calculate Average of N Numbers
* Average = (5 + 6 + 9 + 10) / 4 = 30/4 = 7.5
*/
public class AverageOfN {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc = new Scanner(System.in);
System.out.println("Total count of number to find the average of: ");
int n = sc.nextInt();
int sum = 0;
System.out.println("Enter the numbers: ");
for(int i=0;i<n;i++){
sum += sc.nextInt();
}
double average = sum/(double)n; // typecasting n from int to double for decimal division
System.out.println("Average of n given numbers is "+average);
}
}