Program to Print Numbers in a Range (1,upper) Without Using any Loops or by Using Recursion

Python Program to Print Numbers in a Range (1,upper) Without Using any Loops or by Using Recursion

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If we examine closely at this problem, we can see that the concept of “loop” is to track some counter value, such as “i=0″ till I = higher”. So, if we aren’t permitted to use loops, how can we track something in Python?
One option is to use ‘recursion,’ however we must be careful with the terminating condition. Here’s a solution that uses recursion to output numbers.

Examples:

Example1:

Input:

Enter some upper limit range = 11

Output:

The numbers from 1 to 11 without using loops : 
1
2
3
4
5
6
7
8
9
10
11

Example2:

Input:

Enter some upper limit range = 28

Output:

The numbers from 1 to 28 without using loops : 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

Program to Print Numbers in a Range (1,upper) Without Using any Loops/Recursive Approach

Below are the ways to print all the numbers in the range from 1 to upper without using any loops or by using recursive approach.

Method #1:Using Recursive function(Static Input)

Approach:

  • Give the upper limit range using static input.
  • Create a recursive function.
  • Create a basic case for that function in when the integer is greater than zero.
  • If the number is more than zero, call the function again with the input set to the number -1.
  • Print the number.
  • Exit of program.

Below is the implementation:

# function which prints numbers from 1 to gievn upper limit range
# without loop/by using recursion


def printNumbers(upper_limit):
  # checking if th upper limit value is greater than 0 using if statement
    if(upper_limit > 0):
      # If the number is more than zero, call the function again with
      # the input set to the number -1.
        printNumbers(upper_limit-1)
        # Print the upper limit
        print(upper_limit)


# giveen upper limt range
upper_limit = 28
print('The numbers from 1 to', upper_limit, 'without using loops : ')
# passing the given upper limit range to printNumbers
printNumbers(upper_limit)

Output:

The numbers from 1 to 28 without using loops : 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

Method #2:Using Recursive function(User Input)

Approach:

  • Scan the upper limit range using int(input()).
  • Create a recursive function.
  • Create a basic case for that function in when the integer is greater than zero.
  • If the number is more than zero, call the function again with the input set to the number -1.
  • Print the number.
  • Exit of program.

Below is the implementation:

# function which prints numbers from 1 to gievn upper limit range
# without loop/by using recursion


def printNumbers(upper_limit):
  # checking if th upper limit value is greater than 0 using if statement
    if(upper_limit > 0):
      # If the number is more than zero, call the function again with
      # the input set to the number -1.
        printNumbers(upper_limit-1)
        # Print the upper limit
        print(upper_limit)


# giveen upper limt range
upper_limit = int(input('Enter some upper limit range = '))
print('The numbers from 1 to', upper_limit, 'without using loops : ')
# passing the given upper limit range to printNumbers
printNumbers(upper_limit)

Output:

Enter some upper limit range = 11
The numbers from 1 to 11 without using loops : 
1
2
3
4
5
6
7
8
9
10
11

Explanation:

  • The user must enter the range’s top limit.
  • This value is supplied to the recursive function as an argument.
  • The recursive function’s basic case is that number should always be bigger than zero.
  • If the number is greater than zero, the function is called again with the argument set to the number minus one.
  • The number has been printed.
  • The recursion will continue until the number is less than zero.