C Language Basics Quiz

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Questions and Answers

What is the data type of the variable 'x' in the declaration: 'register int x;'?

  • int (correct)
  • register
  • auto
  • extern

What is the output of the following code snippet: 'int x = 5; x = x++;'?

  • 7
  • Undefined behavior (correct)
  • 5
  • 6

What is the logical operator that performs a logical NOT operation in C?

  • &&
  • ||
  • ! (correct)
  • &

What is the relational operator that checks if a value is less than or equal to another in C?

<p>&lt;= (D)</p> Signup and view all the answers

What is the assignment operator that performs multiplication and assignment in C?

<p>*= (B)</p> Signup and view all the answers

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Study Notes

Declarations of Variables

  • In C, a variable must be declared before it can be used
  • Declaration of a variable specifies its type and identifier (name)
  • Example: int x; declares an integer variable named x
  • Variables can be declared with an initial value using the assignment operator (=)
  • Example: int x = 10; declares an integer variable named x and initializes it with the value 10

Data Types

  • C has multiple data types, including:
    • int: whole numbers (e.g. 1, 2, 3, etc.)
    • float: decimal numbers (e.g. 3.14, -0.5, etc.)
    • char: single characters (e.g. 'a', 'B', etc.)
    • double: double precision decimal numbers (e.g. 3.14159, -0.00005, etc.)

Assignment Operator

  • The assignment operator (=) is used to assign a value to a variable
  • Example: x = 10; assigns the value 10 to the variable x
  • The assignment operator can also be used with expressions
  • Example: x = 5 + 5; assigns the result of the expression 5 + 5 to the variable x

Incremental and Decrement Operators

  • Incremental operator (++) increases the value of a variable by 1
  • Example: x++; increases the value of x by 1
  • Decremental operator (--) decreases the value of a variable by 1
  • Example: x--; decreases the value of x by 1
  • These operators can be used in both prefix and postfix forms
  • Example: ++x and x++ both increase the value of x by 1, but have different effects on the value of the expression

Logical Operators

  • Logical operators are used to combine conditional statements
  • There are three logical operators:
    • &amp;&amp; (logical AND): true if both operands are true
    • || (logical OR): true if at least one operand is true
    • ! (logical NOT): true if the operand is false
  • Example: if (x &gt; 5 &amp;&amp; x &lt; 10) { ... } executes the code inside the if statement if x is between 5 and 10

Relational Operators

  • Relational operators are used to compare values
  • There are six relational operators:
    • == (equal to)
    • != (not equal to)
    • &gt; (greater than)
    • &lt; (less than)
    • &gt;= (greater than or equal to)
    • &lt;= (less than or equal to)
  • Example: if (x &gt; 5) { ... } executes the code inside the if statement if x is greater than 5

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