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5.6: Chapter Summary

  • Page ID
    117554
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    Highlights from this chapter include:

    • A while loop runs a set of statements, known as the loop body, while a given condition, known as the loop expression, is true.
    • A for loop can be used to iterate over elements of a container object.
    • A range() function generates a sequence of integers between the two numbers given a step size.
    • A nested loop has one or more loops within the body of another loop.
    • A break statement is used within a for or a while loop to allow the program execution to exit the loop once a given condition is triggered.
    • A continue statement allows for skipping the execution of the remainder of the loop without exiting the loop entirely.
    • A loop else statement runs after the loop's execution is completed without being interrupted by a break statement.

    At this point, you should be able to write programs with loop constructs. The programming practice below ties together most topics presented in the chapter.

    Function Description

    range(end)

    Generates a sequence beginning at 0 until
    end
    with step size of 1.

    range(start, end)

    Generates a sequence beginning at start until end with step size of 1.

    range(start, end, s)

    Generates a sequence beginning at start until end with the step size of s.

    Loop constructs Description

    while loop

        # initialization
        while expression:
          # loop body
    
        # statements after the loop

    for loop

        # initialization
        for loop_variable in container:
          # loop body
    
        # statements after the loop

    Nested while loop

        while outer_loop_expression:
          # outer loop body (1)
          while inner_loop_expression:
            # inner loop body
          # outer loop body (2)
    
        # statements after the loop

    break statement

        # initialization
        while loop_expression:
          # loop body
          if break_condition:
            break
          # remaining body of loop
    
        # statements after the loop

    continue statement

        # initialization
        while loop_expression:
          # loop body
          if continue_condition:
            continue
          # remaining body of loop
    
        # statements after the loop

    Loop else statement

        # initialization
        for loop_expression:
          # loop body
          if break_condition:
            break
          # remaining body of loop
        else:
          # loop else statement
        
        # statements after the loop
    Table 5.4 Chapter 5 reference.
    Try It: Prime numbers

    Write a program that takes in a positive integer number (N) and prints out the first N prime numbers on separate lines.

    Note: A prime number is a number that is not divisible by any positive number larger than 1. To check whether a number is prime, the condition of number % i != 0 can be checked for i greater than 1 and less than number.

    Ex: if N = 6, the output is:

        2
        3
        5
        7
        11
        13

    This page titled 5.6: Chapter Summary is shared under a CC BY 4.0 license and was authored, remixed, and/or curated by OpenStax via source content that was edited to the style and standards of the LibreTexts platform.