Enumerated Types in Programming

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Questions and Answers

What does the 'typedef' keyword allow us to do in C?

  • Create a new type from scratch
  • Define a function
  • Declare a variable
  • Create a new name for an existing type (correct)

What is the significance of '&' in C when used with variables?

  • Evaluates the size of a variable
  • Returns the address of a variable (correct)
  • Updates the value of a variable
  • Evaluates the value of a variable

When declaring a pointer variable in C, what does the '*' symbol indicate?

  • It represents the size of the data it points to
  • It indicates the end of the line
  • It declares an array
  • It denotes that the variable is a pointer (correct)

What does dereferencing a pointer mean in C?

<p>Accessing the value stored at the memory location pointed to (D)</p> Signup and view all the answers

What does 'typedef double vector;' create in C?

<p>A new type named 'vector' (D)</p> Signup and view all the answers

What happens when you assign the address of one pointer variable to another pointer variable in C?

<p>Both pointers point to the same location (B)</p> Signup and view all the answers

What primary purpose do types serve in C's type system?

<p>To assist the compiler in generating code (B)</p> Signup and view all the answers

In C, what happens when dividing an integer variable by a decimal value?

<p>The result is promoted to a float (C)</p> Signup and view all the answers

Which of the following is true about automatic type conversion in C?

<p>It promotes the result of integer division to a float (A)</p> Signup and view all the answers

What happens when assigning a character to an integer variable in C?

<p>The character is implicitly converted to its ASCII value (C)</p> Signup and view all the answers

When working with pointers in C, what is essential to consider?

<p>Pointers must be dereferenced before use (A)</p> Signup and view all the answers

What is the purpose of using enums in C?

<p>To provide hints to readers of the code (A)</p> Signup and view all the answers

How are arrays indexed in C?

<p>Not bounds checked (B)</p> Signup and view all the answers

What is the purpose of a terminator in C strings?

<p>Signal the end of a string (A)</p> Signup and view all the answers

How are structs used in C?

<p>To bundle values of different types together (C)</p> Signup and view all the answers

In C, how can we access fields within a struct?

<p>Through pointers or field names (C)</p> Signup and view all the answers

What is one consequence of not using terminators for strings in C?

<p>Strings lose their length information (C)</p> Signup and view all the answers

Why should we avoid passing structs to functions or returning them directly?

<p>Structs may lose information during function calls (D)</p> Signup and view all the answers

What does an enum represent in C?

<p>A predefined set of named constants (D)</p> Signup and view all the answers

How does C represent strings?

<p>&quot;char&quot; arrays terminated by a specific character (C)</p> Signup and view all the answers

"int is_northwest(struct point p) { return (p.x > 0 && p.y > 0); }": What does this function check?

<p>&quot;if both coordinates of point p are positive&quot; (D)</p> Signup and view all the answers

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