Operators in C Programming
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Questions and Answers

What is the purpose of an operator in programming?

  • To perform operations (correct)
  • To define functions
  • To declare variables
  • To display output on the screen

    • Which type of operator is used to add two operands?

  • Relational operator
  • Logical operator
  • Assignment operator
  • Arithmetic operator (correct)

    • What does the term 'precedence of operators' refer to?

  • Order of evaluation of operators (correct)
  • Speed of execution
  • Number of operands an operator takes
  • Type of data used in a program

    • In 'int value = 10+20*20;', why is the value 210?

    <p>Multiplicative operator is evaluated before Additive operator (B)</p> Signup and view all the answers

    Which type of operator checks the relationship between two operands?

    <p>Relational operator (D)</p> Signup and view all the answers

    What does the Unary + operator do?

    <p>Finds the absolute value of a number (B)</p> Signup and view all the answers

    Which type of operator is used to assign a value to a variable?

    <p>= operator (D)</p> Signup and view all the answers

    What is the purpose of Turnery or Conditional Operators?

    <p>Make decisions based on conditions (C)</p> Signup and view all the answers

    What is the purpose of the sizeof operator in C?

    <p>To find the memory space allocated for data types (C)</p> Signup and view all the answers

    In C, how is the bitwise AND operator denoted?

    <p>&amp; (B)</p> Signup and view all the answers

    Which operand is greater in the expression 'A' + 2?

    <p>A (A)</p> Signup and view all the answers

    What output would be generated by the bitwise OR operator if one operand is 0?

    <p>1 (B)</p> Signup and view all the answers

    Which operator is used to perform left shift in C?

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

    What is true about the modulo-arithmetic operator in C?

    <p>It operates on integer operands as required (C)</p> Signup and view all the answers

    How are invalid arithmetic expressions often represented?

    <p>With missing operators connecting operands (C)</p> Signup and view all the answers

    What role does the comma operator play in C?

    <p>It links related expressions together (B)</p> Signup and view all the answers

    What is the purpose of the getchar() function in C programming?

    <p>To read a single character from the keyboard (B)</p> Signup and view all the answers

    Which function in C is used to display a character value on the screen or console?

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

    What will be the output of the code snippet provided?

    <p>Enter a value : this is test You entered: t (A)</p> Signup and view all the answers

    What is the main purpose of the gets() function in C programming?

    <p>To read a single string from the keyboard (D)</p> Signup and view all the answers

    Which format specifier is used for signed integer values in formatted input and output operations?

    <p>%d (A)</p> Signup and view all the answers

    What does the printf() function do in C programming?

    <p>Display any value on the console screen (A)</p> Signup and view all the answers

    Which function can be used to write output to the standard output stream in C?

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

    '%lf' is used in C programming for which type of data?

    <p>Double (floating data) (A)</p> Signup and view all the answers

    What is the first step to convert a given valid C expression to its mathematical form?

    <p>Determine the order in which the operators are bound to their operands (D)</p> Signup and view all the answers

    Which operators have the next highest precedence after unary operators?

    <p>Multiplicative operators (D)</p> Signup and view all the answers

    In the given expression -a+ b * c - d I e + f, what is the associativity of additive operators + and -?

    <p>Left-to-right (A)</p> Signup and view all the answers

    Why does the expression -a-+ -b++ * -c appear invalid?

    <p>The excessive use of operators (D)</p> Signup and view all the answers

    Which operator in C has the highest precedence?

    <ul> <li>(B)</li> </ul> Signup and view all the answers

    If a simple expression can be directly converted to its mathematical form, what does it imply?

    <p>The expression is complex (B)</p> Signup and view all the answers

    What does it mean when two operators are said to have 'right-to-left associativity'?

    <p>Operators are bound to their operands from right to left (C)</p> Signup and view all the answers

    Why do we need operator precedence and associativity rules in C expressions?

    <p>To determine the order in which operations are performed (D)</p> Signup and view all the answers

    What is the purpose of the printf() function in C programming?

    <p>Printing values on the console screen (C)</p> Signup and view all the answers

    Which header file contains the pre-defined function printf() in C programming?

    <p>stdio.h (B)</p> Signup and view all the answers

    What is the purpose of using the & symbol in scanf() function in C?

    <p>To store variable values in memory (D)</p> Signup and view all the answers

    Which function prints a string into a character array instead of displaying it on the console screen?

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

    In the C programming language, what does sscanf() function do?

    <p>Reads data from strings or arrays (D)</p> Signup and view all the answers

    What happens if a wrong format specifier is used with printf() function?

    <p>It displays garbage values on screen (C)</p> Signup and view all the answers

    Which operator is used to store variable values at their respective memory locations in scanf() function?

    <p>&amp; (C)</p> Signup and view all the answers

    What output would be expected from the given code snippet? C program to implement scanf() function #include int main() { char str; int a = 2, b = 8; sprintf(str, "%d and %d are even number", a, b); printf("%s", str); return 0; }

    <p>&quot;2 and 8 are even numbers&quot; (D)</p> Signup and view all the answers

    Study Notes

    Operators in Programming

    • Operators perform operations on one or more operands in programming languages.
    • The addition operator (+) is used to add two operands together.
    • Precedence of operators determines the order in which operations are processed in expressions.

    Expression Evaluation

    • In the expression int value = 10 + 20 * 20;, multiplication takes precedence, resulting in value being 210 (10 + 400).
    • Relational operators check the relationship between two operands, such as equality or inequality.

    Unary and Assignment Operators

    • The Unary + operator signifies a positive value or operates with a single operand.
    • The assignment operator (=) assigns a value to a variable.

    Conditional and Sizeof Operators

    • The ternary (conditional) operator evaluates a condition and returns one of two values based on the result.
    • The sizeof operator determines the size, in bytes, of a data type or variable in C.

    Bitwise Operators

    • In C, the bitwise AND operator is represented by "&".
    • The output from the bitwise OR operator (|) with a zero operand is the value of the other operand.
    • The left shift operator (<<) shifts bits to the left in C.

    Modulo and Invalid Expressions

    • The modulo operator (%) returns the remainder of a division operation.
    • Invalid arithmetic expressions may appear as syntax errors.

    Comma Operator and Input/Output Functions

    • The comma operator allows two expressions to be evaluated in a single statement, returning the value of the second expression.
    • The getchar() function reads a single character from standard input.
    • The putchar() function displays a character value on the console.

    String and Formatted Input/Output

    • The gets() function reads a string from the input until a newline is encountered.
    • The format specifier '%d' is used for signed integer values in formatted input/output.

    printf() Function

    • The printf() function formats and outputs data to the console.
    • '%lf' is used for specifying double-precision floating-point numbers.

    Expression Conversion and Operator Precedence

    • The first step in converting a valid C expression to its mathematical form involves identifying and grouping operands.
    • Unary operators have the highest precedence, followed by multiplicative and then additive operators (+/-).
    • Operators with right-to-left associativity process from right to left in expressions.

    Function and Header File Usage

    • The scanf() function uses the & symbol to get the memory address of variables for input.
    • sscanf() reads formatted data from a string instead of standard input.
    • A wrong format specifier in printf() may lead to unexpected output or errors.

    Memory Storage and Example Code

    • The memory location storing variable values is managed by the scanf() function through the use of &'s.
    • Example code with sprintf() incorrectly writes into a string due to lacking proper memory allocation, leading to undefined behavior.

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    Description

    Test your knowledge on different types of operators used in C programming, including arithmetic, relational, shift, logical, bitwise, ternary, assignment, and miscellaneous operators. Learn about the precedence of operators in C language.

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