CS50 Week 2 Quiz
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Questions and Answers

What is the purpose of the main function in a C program?

The main function serves as the entry point for the program where execution begins.

What does the following code snippet do: print("Hello");?

It prints the string 'Hello' to the standard output.

How is an array of integers initialized in C with specific values?

An array can be initialized using syntax like int nights[] = {7, 8, 6, 7, 8};

What is the result of declaring an array as int nights[5];?

<p>It creates an array named <code>nights</code> that can hold 5 integer values.</p> Signup and view all the answers

How can you create an array where each value is double the previous integer, starting with 1?

<p>You can declare it as <code>int array[10];</code> and use a loop to set <code>array[i] = array[i-1] * 2;</code>.</p> Signup and view all the answers

What does the notation nights[2] represent in the context of an array?

<p>It accesses the third element of the array <code>nights</code>.</p> Signup and view all the answers

What is the output of the print function if called with the argument "Hello"?

<p>The output will be 'Hello'.</p> Signup and view all the answers

Why is it important to specify the size of an array in C?

<p>Specifying the size helps the compiler allocate the necessary memory for the array.</p> Signup and view all the answers

What does the following code imply: int nights = {7, 8, 6, 7, 8};?

<p>There is an error because <code>nights</code> should be declared as an array, not a single integer.</p> Signup and view all the answers

In the context of arrays, what does the term 'index' refer to?

<p>An index refers to a specific position within an array, starting from 0.</p> Signup and view all the answers

Flashcards

main function purpose

The starting point of program execution.

print("Hello"); output

Displays 'Hello' on the screen.

Initialize an integer array

Use curly braces: int nights[] = {7, 8, 6, 7, 8};

int nights[5]; result

Allocates space for 5 integers named nights.

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nights[2] meaning

Accesses the third element (index 2).

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print("Hello") output

The output is: Hello

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Why specify array size?

To allocate the correct amount of memory.

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int nights = {7, 8, 6, 7, 8}; issue

There is an error; nights must be declared as an array.

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Array 'index' meaning

The position of an element in the array, starting from 0.

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Doubling array values

Declare int array[10]; then loop, setting array[i] = array[i-1] * 2;

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Study Notes

Compilation

  • Basic C code structure illustrated with a simple program: int main(void) { print("Hello"); }
  • Assembly code representation begins with the main function, showcasing function prologue with stack manipulation.
  • The binary representation of the program illustrates how data is stored in memory.

Arrays

  • Concept of arrays introduced, visualized with characters and their corresponding memory addresses.
  • Example array: letters 'H', 'E', 'L', 'L', 'O' mapping each character to an index value.
  • Array values can be structured as integers, demonstrating indexing and storage (e.g., int nights[] = {7, 8, 6, 7, 8};).

Doubling Up Challenge

  • A problem set assignment to create an integer array where each element is double the previous one, starting from 1.
  • Encourages practice with arrays by requiring printing of each integer sequentially.

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Test your knowledge on key concepts covered in CS50 Week 2, including compilation, arrays, strings, and command-line arguments. Dive into problem sets and coding examples to reinforce your understanding. Perfect for students looking to strengthen their grasp on these essential programming fundamentals.

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