C Programming Quiz: Variable Names, Output, Constants, sizeof()
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Questions and Answers

What is the purpose of the & operator in C?

  • Bitwise AND
  • Address of operator (correct)
  • Pointer to operator
  • Bitwise OR

    • Which of the following is the correct way to access the fourth element of an array named nums?

  • nums.4
  • nums(4)
  • nums{4}
  • nums (correct)

    • What is the output of the following code?

    int i = 0; for (; i < 5; i++) { printf("%d ", i); }

  • Infinite loop
  • 1 2 3 4
  • 0 1 2 3 (correct)
  • 0 1 2 3 4

    • Which of the following statements is true about the do-while loop in C?

    <p>The loop body is executed at least once</p> Signup and view all the answers

    What is the correct way to define a function in C that returns an integer and takes two parameters a and b?

    <p>int functionName(int a, int b) { }</p> Signup and view all the answers

    Which of the following is NOT a valid way to declare a string in C?

    <p>string str = &quot;Hello&quot;;</p> Signup and view all the answers

    Which of the following is NOT a valid C variable name?

    <p>123variable</p> Signup and view all the answers

    What does the sizeof() operator return in C?

    <p>Size of the type</p> Signup and view all the answers

    What does the scanf() function do in C?

    <p>Reads formatted input</p> Signup and view all the answers

    What is the result of the expression 3 / 2 in C?

    <p>1.0</p> Signup and view all the answers

    Which of the following is a logical operator in C?

    <p>||</p> Signup and view all the answers

    What is the correct way to declare a constant in C?

    <p>const int CONSTANT = 10;</p> Signup and view all the answers

    Study Notes

    C Variable Names

    • myVariable and variable123 are valid variable names
    • 123variable is not a valid variable name (numbers cannot start a variable name)
    • _variable is a valid variable name

    C Output

    • printf("%d", x++); outputs 5 (post-increment x++ returns the original value of x)

    Declaring Constants in C

    • const int CONSTANT = 10; is the correct way to declare a constant in C

    sizeof() Operator

    • The sizeof() operator returns the size of a type or variable in bytes

    Division in C

    • The result of the expression 3 / 2 in C is 1 (integer division truncates the decimal part)

    Logical Operators in C

    • || is a logical operator in C (logical OR)

    Array Declaration in C

    • int array[10]; is the syntax to declare an array in C with 10 elements

    scanf() Function

    • The scanf() function reads formatted input from the standard input

    Terminating a C Program

    • return 0; is the correct way to terminate a C program

    Conditional Operator

    • x &gt; y ? x : y returns x if x is greater than y, and y otherwise

    Header Files in C

    • stdio.h is the header file required for input and output operations in C

    break Statement

    • The purpose of the break statement in a loop is to terminate the loop

    for Loop Syntax

    • The correct syntax for the for loop in C is for (int i = 0; i &lt; 10; i++)

    while Loop Output

    • The output of the code while (i &lt; 5) { printf("%d ", i); i += 2; } is 0 2 4

    String Declaration in C

    • char str[] = "Hello"; and char *str = "Hello"; are valid ways to declare a string in C
    • char str = "Hello"; and string str = "Hello"; are not valid ways to declare a string in C

    if Statement

    • The output of the code if (x = 6) printf("True"); else printf("False"); is True (assignment x = 6 has a non-zero value, which is considered true)

    continue Statement

    • The purpose of the continue statement in a loop is to skip the remaining code in the loop and proceed to the next iteration

    Array Access

    • arr is a pointer to the first element of the array, so printf("%d", arr); prints the memory address of the first element (garbage value)

    do-while Loop

    • The loop body of a do-while loop is executed at least once before the condition is evaluated

    Prefix Increment Operator

    • The prefix increment operator ++i increments i before returning its value, so printf("%d", ++i); outputs 11

    Array Access

    • nums[3] is the correct way to access the fourth element of an array named nums

    & Operator

    • The &amp; operator is an address of operator, which returns the memory address of a variable

    for Loop Output

    • The output of the code for (; i &lt; 5; i++) { printf("%d ", i); } is 0 1 2 3 4

    Function Definition in C

    • The correct way to define a function in C that returns an integer and takes two parameters a and b is int functionName(int a, int b) { }

    strcmp() Function

    • The strcmp() function compares two strings, returning a negative value if the first string is less than the second, zero if they are equal, and a positive value if the first string is greater than the second.

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    Quiz Team

    Description

    Test your knowledge of C programming with this quiz! Identify valid variable names, predict the output of code snippets, determine the correct way to declare constants, and understand the purpose of the sizeof() operator.

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