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10 Questions

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CS50 Week 2 Quiz

Created by

@UncomplicatedClematis

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];`?

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

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

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

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

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

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

The output will be 'Hello'. Signup and view all the answers

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

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

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

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

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

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

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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Description

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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