Correct Answer: int
Explanation: In C programming, the keyword “int” is used to declare integer variables. For example, “int x;” declares a variable named ‘x’ of type integer.
Correct Answer: 1 byte
Explanation: The ‘char’ data type in C is typically 1 byte in size. It is used to store characters and small integers within the ASCII range.
Correct Answer: float
Explanation: The ‘float’ data type in C is used to store single-precision floating-point numbers, which have a smaller range and precision compared to ‘double’.
Correct Answer: The size of the variable in bytes
Explanation: The ‘sizeof’ operator in C returns the size of a variable or data type in bytes. For example, ‘sizeof(int)’ returns the size of an integer in bytes.
Correct Answer: %
Explanation: The modulus operator in C is represented by the ‘%’ symbol. It returns the remainder of a division operation.
Correct Answer: Garbage value
Explanation: In C programming, the default value of an uninitialized variable is a garbage value, which is the value stored at its memory location before it is explicitly assigned a value.
Correct Answer: bool
Explanation: In C99 and later versions, the ‘bool’ data type is used to store true or false values, with ‘true’ represented by non-zero and ‘false’ represented by zero.
Correct Answer: It depends on the system
Explanation: The maximum value that can be stored in an ‘int’ variable in C depends on the system architecture. It can vary between different systems.
Correct Answer: \n
Explanation: The escape sequence ‘\n’ is used to represent a new line character in C. It moves the cursor to the beginning of the next line.
Correct Answer: pointer
Explanation: In C programming, the ‘pointer’ data type is used to store memory addresses. It holds the address of a variable or a memory location in the computer’s memory.
Correct Answer: float
Explanation: Single-precision floating-point numbers are stored using the ‘float’ data type in C, which typically occupies 4 bytes of memory.
Correct Answer: 4 bytes
Explanation: On most modern systems, the ‘int’ data type in C occupies 4 bytes of memory, allowing it to represent integer values within a certain range.
Correct Answer: char
Explanation: The ‘char’ data type in C is used to store single characters, such as letters, digits, and special symbols. It typically occupies 1 byte of memory.
Correct Answer: It varies depending on the system
Explanation: The range of values that can be stored in a ‘char’ variable in C can vary depending on the system architecture. It may be signed or unsigned, affecting the range of representable values.
Correct Answer: double
Explanation: Double-precision floating-point numbers are stored using the ‘double’ data type in C, which typically occupies 8 bytes of memory, providing increased precision compared to ‘float’.
Correct Answer: 4 bytes
Explanation: The default size of the ‘float’ data type in C is typically 4 bytes on most systems, allowing it to store single-precision floating-point numbers.
Correct Answer: long double
Explanation: The ‘long double’ data type in C is used to store large floating-point numbers with increased precision compared to ‘float’ and ‘double’. It typically occupies more memory than ‘double’.
Correct Answer: It varies depending on the system
Explanation: The maximum value that can be stored in a ‘char’ variable in C depends on whether it is signed or unsigned, which varies depending on the system architecture.
Correct Answer: long
Explanation: The ‘long’ data type in C is used to store very large integer values, providing a wider range compared to the ‘int’ data type.
Correct Answer: 8 bytes
Explanation: The ‘double’ data type in C typically occupies 8 bytes of memory on most systems, allowing it to store double-precision floating-point numbers.
Correct Answer: long
Explanation: The ‘long’ data type in C is used to store integers with a larger range compared to ‘int’. It typically occupies 4 or 8 bytes of memory, depending on the system.
Correct Answer: const
Explanation: The ‘const’ keyword in C is used to declare a variable as constant, meaning its value cannot be changed once it is initialized.
Correct Answer: int
Explanation: In C, boolean values are often represented using the ‘int’ data type, where ‘0’ represents false and any non-zero value represents true.
Correct Answer: 65535
Explanation: The maximum value that can be stored in an ‘unsigned int’ variable in C is 65535, as it can store only non-negative integers.
Correct Answer: long long
Explanation: The ‘long long’ data type in C is used to store large integers with increased precision, providing a wider range compared to ‘int’ and ‘long’.
Correct Answer: It varies depending on the system
Explanation: The size of the ‘long double’ data type in C can vary depending on the system architecture and compiler implementation, typically ranging from 8 to 16 bytes.
Correct Answer: void
Explanation: The ‘void’ data type in C is used to represent the absence of a value. It is commonly used for functions that do not return a value or pointers that do not point to any data type.
Correct Answer: 0
Explanation: Global variables in C are automatically initialized to zero if no initial value is specified, unlike local variables which contain garbage values if left uninitialized.
Correct Answer: wchar_t
Explanation: The ‘wchar_t’ data type in C is used to store wide characters, providing a wider range compared to the standard ‘char’ data type.
Correct Answer: It varies depending on the system
Explanation: The size of the ‘wchar_t’ data type in C can vary depending on the system architecture and compiler implementation, typically ranging from 2 to 4 bytes.
Correct Answer: wchar_t
Explanation: The ‘wchar_t’ data type in C is commonly used to store a single Unicode character, which can represent characters from various language scripts.
Correct Answer: It varies depending on the system
Explanation: The size of the ‘wchar_t’ data type in C can vary depending on the system architecture and compiler implementation, typically ranging from 2 to 4 bytes.
Correct Answer: char
Explanation: In C programming, the ‘char’ data type is commonly used to store a single byte of data, which can represent characters or small integers.
Correct Answer: 2 bytes
Explanation: The ‘short’ data type in C typically occupies 2 bytes of memory on most systems, allowing it to store integer values within a certain range.
Correct Answer: long long
Explanation: The ‘long long’ data type in C is used to store very large integer values with increased precision compared to ‘int’ and ‘long’.
Correct Answer: It depends on the system
Explanation: The maximum value that can be stored in a ‘long’ variable in C depends on the system architecture, as it can vary between systems.
Correct Answer: long double
Explanation: The ‘long double’ data type in C is used to store single-precision floating-point numbers with increased precision compared to ‘float’.
Correct Answer: *
Explanation: The ‘*’ symbol in C is used to declare a variable as a pointer, indicating that it stores the memory address of another variable.
Correct Answer: bool
Explanation: In C99 and later versions, the ‘bool’ data type is used to store boolean values, where ‘true’ is represented by non-zero and ‘false’ by zero.
Correct Answer: Garbage value
Explanation: Uninitialized local variables in C contain garbage values, which are the values stored at their memory locations before they are explicitly assigned a value.
Correct Answer: unsigned
Explanation: The ‘unsigned’ keyword in C is used to declare a variable as unsigned, meaning it can only store non-negative integer values.
Correct Answer: 0 to 255
Explanation: The range of values that can be stored in an ‘unsigned char’ variable in C is from 0 to 255, as it can only store non-negative integers.
Correct Answer: long
Explanation: The ‘long’ modifier in C is used to increase the range of values that can be stored in an integer variable, allowing it to represent larger integers.
Correct Answer: 4 bytes
Explanation: The ‘long int’ data type in C typically occupies 4 bytes of memory on most systems, allowing it to store larger integer values.
Correct Answer: short
Explanation: The ‘short’ modifier in C is used to decrease the range of values that can be stored in an integer variable, allowing it to represent smaller integers.
Correct Answer: -32768 to 32767
Explanation: The range of values that can be stored in a ‘short int’ variable in C is from -32768 to 32767, as it is typically a signed 16-bit integer.
Correct Answer: int
Explanation: In C, the ‘int’ keyword itself can be used to declare integer variables without explicitly specifying their size, relying on the compiler to determine an appropriate size.
Correct Answer: 8 bytes
Explanation: The ‘unsigned long int’ data type in C typically occupies 8 bytes of memory on most systems, allowing it to store larger non-negative integer values.
Correct Answer: double
Explanation: In C, the ‘double’ data type is used to declare floating-point variables without explicitly specifying their size, as it typically provides more precision than ‘float’.
Correct Answer: -9223372036854775808 to 9223372036854775807
Explanation: The range of values that can be stored in a ‘long long int’ variable in C is from -9223372036854775808 to 9223372036854775807, as it is typically a signed 64-bit integer.
Correct Answer: long unsigned
Explanation: The ‘long unsigned’ modifier in C is used to declare an integer variable as both ‘long’ and ‘unsigned’, allowing it to store large non-negative integer values.
Correct Answer: It varies depending on the system
Explanation: The size of the ‘long double’ data type in C can vary depending on the system architecture and compiler implementation, typically ranging from 8 to 16 bytes.
Correct Answer: double
Explanation: The ‘double’ modifier in C is used to declare a floating-point variable with increased precision compared to ‘float’, typically occupying 8 bytes of memory on most systems.
Correct Answer: It varies depending on the system
Explanation: The range of values that can be stored in a ‘long double’ variable in C can vary depending on the system architecture and compiler implementation, typically providing increased precision compared to ‘double’.
Correct Answer: long long
Explanation: The ‘long long’ modifier in C is used to declare an integer variable with increased range compared to ‘int’, typically allowing it to store larger integer values.
Correct Answer: 2 bytes
Explanation: The ‘short int’ data type in C typically occupies 2 bytes of memory on most systems, providing a smaller range compared to ‘int’.
Correct Answer: long double
Explanation: The ‘long double’ modifier in C is used to declare a floating-point variable with increased precision compared to ‘float’ and ‘double’.
Correct Answer: 0 to 4294967295
Explanation: The range of values that can be stored in an ‘unsigned long int’ variable in C is from 0 to 4294967295, as it can only store non-negative integers.
Correct Answer: long long
Explanation: The ‘long long’ modifier in C is used to declare an integer variable with increased range and size compared to ‘int’ and ‘long’, typically allowing it to store larger integer values.
Correct Answer: 8 bytes
Explanation: The ‘unsigned long long int’ data type in C typically occupies 8 bytes of memory on most systems, allowing it to store larger non-negative integer values.
Correct Answer: int x;
Explanation: In C, the correct syntax to declare a variable named ‘x’ of type integer is ‘int x;’.
Correct Answer: To assign an initial value to a variable
Explanation: Variable initialization in C involves assigning an initial value to a variable at the time of declaration.
Correct Answer: int count = 0;
Explanation: In C, the correct way to initialize a variable named ‘count’ of type integer to 0 is ‘int count = 0;’.
Correct Answer: The variable will contain garbage value
Explanation: If a variable is used without being initialized in C, it will contain a garbage value, which is the value stored at its memory location before it is explicitly assigned a value.
Correct Answer: int a, b, c;
Explanation: In C, multiple variables of the same type can be declared in a single line by separating their names with commas.
Correct Answer: The part of the program where the variable is accessible
Explanation: The scope of a variable in C refers to the part of the program where the variable can be accessed and used.
Correct Answer: const float PI = 3.14;
Explanation: In C, the correct syntax to declare a constant named ‘PI’ with a value of 3.14 is ‘const float PI = 3.14;’.
Correct Answer: To indicate that the variable’s value cannot be changed
Explanation: Declaring a variable as constant in C using the ‘const’ keyword indicates that the variable’s value cannot be changed once it is initialized.
Correct Answer: int x;
Explanation: In C, global variables are declared outside of any function, typically at the beginning of the file, without using the ‘extern’ keyword.
Correct Answer: It indicates the type and name of the variable
Explanation: Variable declaration in C indicates the type and name of the variable, allowing the compiler to allocate memory and perform type checking during compilation.
Correct Answer: Until the function in which it is declared returns
Explanation: Local variables in C have a lifetime limited to the duration of the function in which they are declared. They are destroyed once the function exits.
Correct Answer: Global variables have a longer lifetime compared to local variables.
Explanation: Global variables in C have a longer lifetime compared to local variables. They exist throughout the entire execution of the program.
Correct Answer: The entire program
Explanation: Global variables in C have a scope that extends throughout the entire program, allowing them to be accessed from any part of the code.
Correct Answer: Static variables retain their value between function calls.
Explanation: Static variables in C retain their value between function calls, unlike automatic variables whose value is lost once the function exits.
Correct Answer: The function where it is declared
Explanation: The scope of a static variable in C is limited to the function where it is declared, but its lifetime extends beyond the function call.
Correct Answer: Local variables cannot be accessed from outside the function where they are declared.
Explanation: Local variables in C have a limited scope and cannot be accessed from outside the function where they are declared.
Correct Answer: extern
Explanation: The ‘extern’ keyword in C is used to declare a variable with file scope, allowing it to be accessed from other files.
Correct Answer: Until the program terminates
Explanation: Static variables in C have a lifetime that extends throughout the entire execution of the program, unlike local variables whose lifetime is limited to the function scope.
Correct Answer: File-scope variables can only be accessed within the file where they are declared.
Explanation: File-scope variables in C, whether they are global or static, can only be accessed within the file where they are declared.
Correct Answer: To declare a variable as constant
Explanation: The ‘const’ keyword in C is used to declare a variable as constant, meaning its value cannot be changed after initialization.
Correct Answer: Constants must be initialized at the time of declaration.
Explanation: In C, constants must be initialized at the time of declaration and cannot be modified thereafter.
Correct Answer: const int MAX_VALUE = 100;
Explanation: In C, the correct syntax to declare a constant integer named ‘MAX_VALUE’ with a value of 100 is ‘const int MAX_VALUE = 100;’.
Correct Answer: Using it to define the size of an array
Explanation: Constants in C are often used to define the size of arrays and other fixed values that do not change during program execution.
Correct Answer: They make the code easier to understand and maintain.
Explanation: Constants in C make the code easier to understand and maintain by providing meaningful names to fixed values used throughout the program.
Correct Answer: Constants can only be of integer type.
Explanation: Constants in C can be of various types, including integers, floating-point numbers, characters, and pointers.
Correct Answer: Variables can be modified after initialization, while constants cannot.
Explanation: In C, variables can have their values changed after initialization, while constants cannot be modified once they are initialized.
Correct Answer: The program will not compile.
Explanation: In C, attempting to modify a constant variable results in a compilation error, as constants are meant to be immutable.
Correct Answer: It ensures type consistency between function calls and definitions.
Explanation: Using constants in function prototypes in C ensures type consistency between function calls and their definitions, helping prevent errors related to incorrect parameter types.
Correct Answer: To indicate that the variable’s value can be changed by external factors
Explanation: The ‘volatile’ keyword in C is used to indicate that the value of a variable can be changed unexpectedly by external factors such as hardware interrupts or concurrently executing threads.
Correct Answer: Volatile variables are optimized by the compiler for better performance.
Explanation: Volatile variables in C are not optimized by the compiler for performance improvements, as their values can change unexpectedly due to external factors.
Correct Answer: ‘const’ indicates that the variable’s value cannot change unexpectedly, while ‘volatile’ indicates that it can.
Explanation: The ‘const’ keyword in C indicates that a variable’s value cannot change after initialization, while the ‘volatile’ keyword indicates that its value can change unexpectedly due to external factors.
Correct Answer: Storing variables whose values are computed based on user input.
Explanation: The ‘volatile’ keyword in C is suitable for variables whose values can change unexpectedly, such as those computed based on user input or modified by hardware interrupts.
Correct Answer: The compiler may optimize the code incorrectly, leading to unexpected behavior.
Explanation: Omitting the ‘volatile’ keyword for variables accessed by multiple threads or hardware interrupts in C may lead to incorrect optimizations by the compiler, resulting in unexpected behavior.
Correct Answer: When dealing with variables that are accessed only by a single thread.
Explanation: Using the ‘volatile’ keyword is unnecessary in C when dealing with variables that are accessed only by a single thread, as there are no external factors that can change their values unexpectedly.
Correct Answer: It limits optimizations that could lead to incorrect behavior.
Explanation: The ‘volatile’ keyword in C limits certain optimizations by the compiler that could lead to incorrect behavior, ensuring that the variable’s value is always read from memory rather than cached registers.
Correct Answer: Volatile variables are optimized by the compiler for better performance.
Explanation: Volatile variables in C are not optimized by the compiler for better performance, as their values can change unexpectedly due to external factors.
#include <stdio.h>
int main() {
int integerVariable = 10;
printf("Integer Variable: %d\n", integerVariable);
return 0;
}
Correct Answer: 10
Explanation: The variable `integerVariable` is initialized to 10 using the assignment operator ‘=’.
#include <stdio.h>
int main() {
char characterVariable = 'A';
printf("Character Variable: %c\n", characterVariable);
return 0;
}
Correct Answer: char
Explanation: The variable `characterVariable` is of type ‘char’ as it stores a single character.
#include <stdio.h>
int main() {
double doubleVariable = 6.022e23;
printf("Double Variable: %e\n", doubleVariable);
return 0;
}
Correct Answer: 6.022e23
Explanation: The variable `doubleVariable` is initialized to 6.022e23, representing a large number in scientific notation.
#include <stdio.h>
int main() {
int a = 5;
printf("Value of 'a': %d\n", a);
return 0;
}
Correct Answer: 5
Explanation: The variable ‘a’ is assigned the value 5.
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