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Questions and Answers
What is the purpose of an operator in programming?
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?
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?
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?
In 'int value = 10+20*20;', why is the value 210?
Which type of operator checks the relationship between two operands?
Which type of operator checks the relationship between two operands?
What does the Unary + operator do?
What does the Unary + operator do?
Which type of operator is used to assign a value to a variable?
Which type of operator is used to assign a value to a variable?
What is the purpose of Turnery or Conditional Operators?
What is the purpose of Turnery or Conditional Operators?
What is the purpose of the sizeof operator in C?
What is the purpose of the sizeof operator in C?
In C, how is the bitwise AND operator denoted?
In C, how is the bitwise AND operator denoted?
Which operand is greater in the expression 'A' + 2?
Which operand is greater in the expression 'A' + 2?
What output would be generated by the bitwise OR operator if one operand is 0?
What output would be generated by the bitwise OR operator if one operand is 0?
Which operator is used to perform left shift in C?
Which operator is used to perform left shift in C?
What is true about the modulo-arithmetic operator in C?
What is true about the modulo-arithmetic operator in C?
How are invalid arithmetic expressions often represented?
How are invalid arithmetic expressions often represented?
What role does the comma operator play in C?
What role does the comma operator play in C?
What is the purpose of the getchar() function in C programming?
What is the purpose of the getchar() function in C programming?
Which function in C is used to display a character value on the screen or console?
Which function in C is used to display a character value on the screen or console?
What will be the output of the code snippet provided?
What will be the output of the code snippet provided?
What is the main purpose of the gets() function in C programming?
What is the main purpose of the gets() function in C programming?
Which format specifier is used for signed integer values in formatted input and output operations?
Which format specifier is used for signed integer values in formatted input and output operations?
What does the printf() function do in C programming?
What does the printf() function do in C programming?
Which function can be used to write output to the standard output stream in C?
Which function can be used to write output to the standard output stream in C?
'%lf' is used in C programming for which type of data?
'%lf' is used in C programming for which type of data?
What is the first step to convert a given valid C expression to its mathematical form?
What is the first step to convert a given valid C expression to its mathematical form?
Which operators have the next highest precedence after unary operators?
Which operators have the next highest precedence after unary operators?
In the given expression -a+ b * c - d I e + f, what is the associativity of additive operators + and -?
In the given expression -a+ b * c - d I e + f, what is the associativity of additive operators + and -?
Why does the expression -a-+ -b++ * -c appear invalid?
Why does the expression -a-+ -b++ * -c appear invalid?
Which operator in C has the highest precedence?
Which operator in C has the highest precedence?
If a simple expression can be directly converted to its mathematical form, what does it imply?
If a simple expression can be directly converted to its mathematical form, what does it imply?
What does it mean when two operators are said to have 'right-to-left associativity'?
What does it mean when two operators are said to have 'right-to-left associativity'?
Why do we need operator precedence and associativity rules in C expressions?
Why do we need operator precedence and associativity rules in C expressions?
What is the purpose of the printf() function in C programming?
What is the purpose of the printf() function in C programming?
Which header file contains the pre-defined function printf() in C programming?
Which header file contains the pre-defined function printf() in C programming?
What is the purpose of using the & symbol in scanf() function in C?
What is the purpose of using the & symbol in scanf() function in C?
Which function prints a string into a character array instead of displaying it on the console screen?
Which function prints a string into a character array instead of displaying it on the console screen?
In the C programming language, what does sscanf() function do?
In the C programming language, what does sscanf() function do?
What happens if a wrong format specifier is used with printf() function?
What happens if a wrong format specifier is used with printf() function?
Which operator is used to store variable values at their respective memory locations in scanf() function?
Which operator is used to store variable values at their respective memory locations in scanf() function?
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; }
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; }
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 invaluebeing 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.
