Questions and Answers
What do we use loops for?
Repeat blocks of code
What is wrong with the following code? num = int(input("Enter a number, negative to stop")); while (num >= 0): print ("You entered: " + str(num)); num = int(input("Enter a number, negative to stop")); print ("Done.")
The line num = int(input("Enter a number, negative to stop")) should be indented so it is inside the loop
What is the correct output for the following code? c = 0; while (c < 10): c = c + 5; print (c)
5 and 10
What is the correct output for the following code? c = 3; while (c < 10): c = c + 2; print (c)
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What is the output of the following code? c = 1; sum = 0; while (c < 10): c = c + 3; sum = sum + c; print (sum)
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What must be entered to make the loop print 60, 70, 80? x = 50; while (x < 80): x = x + ____; print (x)
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How many variables are in the program sum = 0; count = 0; while (sum < maximum): maximum = n; print(maximum)?
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What does the following program do? Trace the code.
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What would happen if only negative numbers are entered in the program?
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Computer __________ are used to represent a real-world situation using a computer.
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____________ run experiments using computer models.
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Which of the following is NOT a use of computer simulations?
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_________ _________ _________ use random numbers made by computers to test computer models.
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Computer simulations were first developed during as a part of the __________.
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Study Notes
Loops and Repetition
- Loops are used to repeat blocks of code in programming.
- A classic loop pattern checks a condition before executing, allowing for control over the sequence of operations.
Indentation and Code Structure
- Proper indentation is crucial for code readability and functionality, such as placing input statements inside a loop to ensure they execute correctly.
Code Practices
- Example code for names input continues until "Nope" is entered, demonstrating a basic usage of while loops with user input.
- Understanding output behavior in loops is essential: varying initial conditions for variables can significantly change the loop's output.
Output Analysis
- In code examples, understanding final outputs is critical:
- For
cinitialized to 0 and incremented by 5, outputs are 5 and 10. - A starting value of 3 incremented by 2 yields outputs of 5, 7, 9, and eventually 11.
- For
Variable Count and Functionality
- Identifying variables in loop structures is fundamental, as in a program that finds the maximum—a functionally exhaustive loop to evaluate numerous inputs.
Computational Models and Simulations
- Computer models represent real-world situations, allowing for experimentation and analysis.
- Simulations leverage models to run experiments, crucial for testing hypotheses.
Randomness in Computational Methods
- Monte Carlo Methods involve random number generation to test computer models, providing valuable insights into probabilistic scenarios.
Historical Context
- The origins of computer simulations trace back to WWII, specifically the Manhattan Project, marking significant developments in computational science.
Use Cases and Limitations
- Understanding practical applications of simulations is vital; however, not every action, such as calculating the area of an oval room, falls under the umbrella of simulation purposes.
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Description
This quiz covers fundamental concepts of loops and repetition in programming. It focuses on how loops operate, proper code structure, and the importance of indentation for readability. Additionally, it includes practical examples and analysis of output behavior in loops.
