ProwessApps|Java Programs | Number Series Using Loops

prowessapps.in Number Series Programs

WAP to print Armstrong number from 100 to 500

class Test {
 public static void main(String[] a)
 {
  int temp,r,sum;
  for(int i=100; i<=500; i++) {
   temp = i;
   sum = 0;
   while(temp!=0) {
    r = temp%10;
    sum = sum+(r*r*r);
    temp = temp/10;
   }
   if(sum ==i) {
    System.out.print(i+"  ");
   }
  }  
 }
}

OUTPUT :

153  370  371  407

WAP to print the following series 1 2 3 4 ... n

import java.util.Scanner;
class Test {
 public static void main(String[] a)
 {
  Scanner s=new Scanner(System.in);
  System.out.print("Enter N: ");
  int n = s.nextInt();
  for(int i = 1; i<=n; i++) {
   System.out.print(i+"  ");
  } 
 }
}

OUTPUT :

Enter N: 10
1  2  3  4  5  6  7  8  9  10

WAP to print the following series. 2 4 6 8... n

import java.util.Scanner;
class Test {
 public static void main(String[] a)
 {
  Scanner s=new Scanner(System.in);
  System.out.print("Enter N: ");
  int n = s.nextInt();
  for(int i = 2; i<=n; i=i+2) {
   System.out.print(i+"  ");
  } 
 }
}

OUTPUT :

Enter N: 15
2  4  6  8  10  12  14

WAP to print the following series. 1 3 5 7... n

import java.util.Scanner;
class Test {
 public static void main(String[] a)
 {
  Scanner s=new Scanner(System.in);
  System.out.print("Enter N: ");
  int n = s.nextInt();
  for(int i = 1; i<=n; i=i+2) {
   System.out.print(i+"  ");
  } 
 }
}

OUTPUT :

Enter N: 16
1  3  5  7  9  11  13  15

WAP to print the following series. 3 6 9 12... n

import java.util.Scanner;
class Test {
 public static void main(String[] a)
 {
  Scanner s=new Scanner(System.in);
  System.out.print("Enter N: ");
  int n = s.nextInt();
  for(int i = 1; i<=n; i++) {
   System.out.print((3*i)+"  ");
  } 
 }
}

OUTPUT :

Enter N: 6
3  6  9  12  15  18

WAP to print the following series. 1 3 7 15 31... n

import java.util.Scanner;
class Test {
 public static void main(String[] a)
 {
  Scanner s=new Scanner(System.in);
  System.out.print("Enter N: ");
  int n = s.nextInt();
  int x = 0;
  for(int i = 0; i< n; i++) {
   x = x + (int) Math.pow(2,i);
   System.out.print(x+"  ");
  } 
 }
}

OUTPUT :

Enter N: 5
1  3  7  15  31

WAP to print all prime numbers till 20

class Test {
 public static void main(String[] a)
 {
  int factors;
  for(int i = 1; i<=20; i++) {
   factors = 0;
   for(int j = 1; j<=i; j++) {
    if(i%j ==0) 
     factors++;
   }
   if(factors ==2) {
    System.out.print(i+"  ");
   }
  } 
 }
}

OUTPUT :

2  3  5  7  11  13  17  19

WAP to print the following febonnaci series. 0 1 1 2 3 5 8 13 21 34 upto n times

import java.util.Scanner;
class Test {
 public static void main(String[] a)
 {
  int x = -1, y = 1, z;
  Scanner s=new Scanner(System.in);
  System.out.print("Enter N: ");
  int n = s.nextInt();
  for(int i = 1; i<=n; i++) {
   z = x+y; 
   System.out.print(z+"  ");
   x = y;
   y = z;
  } 
 }
}

OUTPUT :

Enter N: 10
0  1  1  2  3  5  8  13  21  34

WAP to print the following series.1 2 2 3 3 3 4 4 4 4 5 5 5 5 5

class Test {
 public static void main(String[] a)
 {
  for(int i = 1; i<=5; i++) {
   for(int j = 1; j<=i; j++) {
    System.out.print(i+"  ");
   }
  }
 }
}

OUTPUT :

1  2  2  3  3  3  4  4  4  4  5  5  5  5  5

WAP to print the following series. 0 1 3 6 10 15 21... upto n terms

import java.util.Scanner;
class Test {
 public static void main(String[] a)
 {
  Scanner s=new Scanner(System.in);
  System.out.print("Enter N: ");
  int n = s.nextInt();
  int x = 0;
  for(int i = 1; i<=n; i++) {
   System.out.print(x+"  ");
   x = x+i;
  } 
 }
}

OUTPUT :

Enter N: 10
0  1  3  6  10  15  21  28  36  45

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