Java programs to print all the numbers in a range have been shown here. Both of the iterative and recursive approaches have been covered.

## 1. Algorithm to Print All numbers in a range

1. Take input of two numbers n1, n2 as range limit.

2. Set another variable i=n1

3. Iterate i from n1 to n2 by incrementing 1

4. Print value of i in each iteration

## 2. Pseudocode to Print All numbers in a range

Input : Two integer numbers $n_1, n_2$

Output : All the integer numbers from $n_1$ to $n_2$

1. Procedure printAll($n_1$, $n_2$):

2. $i\leftarrow n_1$

3. Repeat until $i > n_2$

4. Print $i$

5. $i \leftarrow i+1$

6. End Procedure

## 3. Time complexity to Print All numbers in a range

Time Complexity: O(n)

Here, $n$ is the no. of terms in the given range.

## 4. Java Program & Output to Print All Integer numbers in a range using Iteration

Code has been copied
/*********************************************
alphabetacoder.com
Java program to print all integer numbers in
a given range using iterative approach
**********************************************/

import java.util.Scanner;

class Main {
public static void main(String[] args) {
// declare instance of Scanner class
Scanner sc = new Scanner(System.in);

// declare variables
int n1, n2, i;

// take input of the inteval
System.out.print("Enter the lower limit = ");
n1 = sc.nextInt();
System.out.print("Enter the upper limit = ");
n2 = sc.nextInt();

// iterate from n1 to n2 and print the numbers
System.out.print("Numbers in the range: ");
for (i = n1; i <= n2; i++)
System.out.print(i + " ");
}
}


Output

Enter the lower limit = 20

Enter the upper limit = 40

Numbers in the range: 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

## 5. Java Program & Output to Print All Integer numbers in a range using Recursion

Code has been copied
/**********************************************
alphabetacoder.com
Java program to print all integer numbers in
a given range using a recursive approach
***********************************************/

import java.util.Scanner;

class Main {
// recursive function
public void printNumbers(int n1, int n2) {
//condition for calling
if (n2 > n1)
printNumbers(n1, n2 - 1);
// print current number
System.out.print(n2 + " ");
}

public static void main(String args[]) {
// declare instance of Scanner class
Scanner sc = new Scanner(System.in);

// declare object of class Main
Main obj = new Main();

// declare variables
int n1, n2;

// take input of the inteval
System.out.print("Enter the lower limit = ");
n1 = sc.nextInt();
System.out.print("Enter the upper limit = ");
n2 = sc.nextInt();

System.out.print("Numbers in the range: ");
// call the recursive function to print
// all the integer numbers in a range
obj.printNumbers(n1, n2);
}
}


Output

Enter the lower limit = -5

Enter the upper limit = 5

Numbers in the range: -5 -4 -3 -2 -1 0 1 2 3 4 5

## 6. Java Program & Output to Print All Float numbers with specific interval in a range using Iteration

Code has been copied
/********************************************
alphabetacoder.com
Java program to print all float numbers with
specific interval in a given range
*********************************************/

import java.util.Scanner;

class Main {
public static void main(String args[]) {
// declare instance of Scanner class
Scanner sc = new Scanner(System.in);

// declare variables
double n1, n2, in, i;

// take input of the inteval
System.out.print("Enter the lower limit = ");
n1 = sc.nextInt();
System.out.print("Enter the upper limit = ");
n2 = sc.nextInt();
System.out.print("Enter the value of interval = ");
in = sc.nextDouble();

System.out.print("Numbers in the range: ");
// dislay all numbers between n1 and n2
// with given interval
for (i = n1; i <= n2; i += in)
System.out.print(i + " ");
}
}


Output

Enter the lower limit = 50

Enter the upper limit = 55

Enter the value of interval = 0.25

Numbers in the range: 50.0 50.25 50.5 50.75 51.0 51.25 51.5 51.75 52.0 52.25 52.5 52.75 53.0 53.25 53.5 53.75 54.0 54.25 54.5 54.75 55.0

## 7. Java Program & Output to Print All Float numbers with specific interval in a range using Recursion

Code has been copied
/*****************************************************
alphabetacoder.com
Java program to print all float numbers with specific
interval in a given range using recursive approach
******************************************************/

import java.util.Scanner;

class Main {
// recursive function
public void printNumbers(double n1, double n2, double in ) {
//condition for calling
if (n2 >= n1) {
// print current number
System.out.print(n1 + " ");
// call recursive function
printNumbers(n1 + in, n2, in);
}
}

public static void main(String args[]) {
// declare instance of Scanner class
Scanner sc = new Scanner(System.in);

// declare object of class Main
Main obj = new Main();

// declare variables
double n1, n2, in;

// take input of the inteval
System.out.print("Enter the lower limit = ");
n1 = sc.nextDouble();
System.out.print("Enter the upper limit = ");
n2 = sc.nextDouble();
System.out.print("Enter the value of interval = ");
in = sc.nextDouble();

System.out.print("Numbers in the range: ");
// call the recursive function to print
// all the float numbers in input range
obj.printNumbers(n1, n2, in);
}
}


Output

Enter the lower limit = 1

Enter the upper limit = 10

Enter the value of interval = 0.625

Numbers in the range: 1.0 1.625 2.25 2.875 3.5 4.125 4.75 5.375 6.0 6.625 7.25 7.875 8.5 9.125 9.75