Python Program to Print Numbers in an Interval

In this article, we will learn how to print all numbers within a given interval using Python. We'll explore different approaches including printing all numbers, only even numbers, only odd numbers, and prime numbers in a range.

Problem Statement

Given a starting and ending range of an interval, we need to print all the numbers (or specific types of numbers) within that interval.

Method 1: Print All Numbers in an Interval

The simplest approach is to use a for loop with range() function to iterate through all numbers ?

start = 5
end = 12

print("All numbers in the interval:")
for num in range(start, end + 1):
    print(num)

All numbers in the interval:
5
6
7
8
9
10
11
12

Method 2: Print Even Numbers in an Interval

To print only even numbers, we check if the number is divisible by 2 ?

start = 5
end = 15

print("Even numbers in the interval:")
for num in range(start, end + 1):
    if num % 2 == 0:
        print(num)

Even numbers in the interval:
6
8
10
12
14

Method 3: Print Odd Numbers in an Interval

Similarly, to print only odd numbers, we check if the number is not divisible by 2 ?

start = 5
end = 15

print("Odd numbers in the interval:")
for num in range(start, end + 1):
    if num % 2 != 0:
        print(num)

Odd numbers in the interval:
5
7
9
11
13
15

Method 4: Print Prime Numbers in an Interval

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. We use nested loops to check for prime numbers ?

start = 10
end = 29

print("Prime numbers in the interval:")
for val in range(start, end + 1):
    # Check if number is greater than 1
    if val > 1:
        # Check for factors from 2 to val-1
        for n in range(2, val):
            if (val % n) == 0:
                break
        else:
            print(val)

Prime numbers in the interval:
11
13
17
19
23
29

Using Step Parameter

You can also use the step parameter in range() to print numbers with specific intervals ?

start = 2
end = 20
step = 3

print("Numbers with step 3:")
for num in range(start, end + 1, step):
    print(num)

Numbers with step 3:
2
5
8
11
14
17
20

Comparison

Conclusion

Python's range() function provides a flexible way to print numbers in any interval. Use simple iteration for all numbers, conditional checks for even/odd numbers, and nested loops for prime number filtering.