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Questions and Answers
What is the primary benefit of using gets() over scanf() when reading user input in C?
Which function in C programming is specifically designed to read a single character from the terminal?
Which statement accurately describes the return value of the putchar() function in C?
In which scenario would scanf() yield incomplete input compared to gets()?
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What should be included at the beginning of a C program to utilize printf() and scanf() functions?
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What will be the result of the expression (A > B) when A holds 10 and B holds 20?
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Which operator can be used to check if two variables are not equal?
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Using the assignment operator '=', what will the value of A be after the operation A += B if A is initially 10 and B is 20?
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What does the expression (A == B) evaluate to when A is 10 and B is 20?
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In the context of dynamic memory management, which function can be used to allocate memory during runtime?
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What operator is used to perform a bitwise AND operation on two integer values?
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Which unary operator will decrement the value of a variable by 1?
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What is the result of applying the logical negation operator '!' to a boolean expression that evaluates to true?
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How does the conditional operator '?:' function in an expression?
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What does the bitwise complement operator '~' do to its operand?
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What is a key reason the C programming language is considered fast?
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Which section of a C program is responsible for including necessary header files?
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What does the definition section in a C program primarily do?
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What is the role of the global declaration section in a C program?
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What indicates that every C program must have a main function?
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In the context of performance, how does C programming compare with higher-level languages like Python?
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What aspect allows C language programs to be extended with new features easily?
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Which statement accurately describes local variable declaration in C?
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Study Notes
Speed
- C language offers fast compilation and execution times due to fewer built-in functions, resulting in lower overhead.
- Newer languages like Java and Python are feature-rich but have additional processing, which slows their performance compared to C.
- As a middle-level language, C allows direct manipulation of computer hardware, an advantage over higher-level languages.
- Statically typed languages like C are generally faster than dynamically typed ones.
Extensibility
- C language is highly extensible, allowing programmers to add new features to existing programs with ease.
Structure of C Program
- A C program consists of six sections: Documentation, Link, Definition, Global Declaration, Main Function, and Output Function.
Documentation Section
- Contains comment lines for documentation purposes.
Link Section
- Provides instructions for the compiler to link necessary header files (e.g.,
#include).
Definition Section
- Uses
#definedirective for defining symbolic constants (e.g.,#define PI 3.14).
Global Declaration Section
- Includes global variables that can be accessed in multiple functions (e.g.,
float area(float r); int a = 7;).
Main Function Section
- Every C program must have a
main()function, which consists of:- Declaration part
- Executable part (Example:
int main(void) { int a = 10; printf("%d", a); return 0; }).
Input/Output Functions
- Standard I/O functions are available in the
stdio.hheader.
printf() and scanf()
-
printf(): Used to display output. -
scanf(): Used to read input from the user (e.g., reads an integer value).
getchar() and putchar()
-
getchar(): Reads a single character from the terminal. -
putchar(): Displays a single character on the screen.
Difference Between scanf() and gets()
-
scanf()halts reading at spaces, whilegets()reads an entire line including spaces.
Operators
- Relational operators include:
-
==: Checks equality (e.g.,A == B). -
!=: Checks inequality. -
>: Greater than. -
<: Less than. -
>=: Greater than or equal to.
-
- Bitwise operators include:
-
&: Bitwise AND. -
|: Bitwise OR. -
^: Bitwise XOR.
-
- Logical operators include:
-
&&: Logical AND. -
||: Logical OR.
-
- Assignment operators modify the value of variables (e.g.,
+=,-=, etc.). - The
sizeofoperator returns the size of a data type or object.
Input Function
- The input function facilitates data entry into a program.
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Description
This quiz covers fundamental concepts of C programming, focusing on speed, extensibility, and the structure of a C program. Test your knowledge on the differences between C and newer languages, as well as the various sections of a C program.
