What is the primary purpose of the malloc function in C?
- To allocate memory for a single variable
- To allocate memory for an array of elements and initialize them
- To free memory allocated by calloc
- To reallocate memory for an array
The primary purpose of the malloc function in C is to allocate memory for a single variable. It returns a pointer to the allocated memory, which can be used to store data.
When reading a file in C, which function can be used to check if the end of the file has been reached?
- fclose()
- feof()
- ferror()
- fseek()
The feof() function is used to check if the end of a file has been reached during file reading operations in C.
Which function is used to close a file that has been opened for reading or writing?
- closefile()
- endfile()
- fclose()
- stopfile()
In C, the fclose() function is used to close a file that has been opened for reading or writing. It is essential to close files to release system resources and ensure that data is properly saved.
What is the standard notation for passing command line arguments in a C program?
- int main(String[] args)
- int main(int argc, char *argv[])
- main(int argc, char *argv[])
- void main(args)
The standard notation for passing command line arguments in a C program is 'int main(int argc, char *argv[])'. 'argc' holds the number of arguments, and 'argv' is an array of argument values.
The ________ statement is used to exit a loop prematurely.
- break
- continue
- return
- switch
In programming, the "break" statement is used to exit a loop prematurely. It is often used in loops such as "for" and "while" to terminate the loop based on a specific condition. The "break" statement is not used to return from a function, control a switch statement, or skip the current iteration of a loop, so it is the correct option.
When declaring a pointer in C, which symbol is used to denote that a variable is a pointer?
- #
- $
- &
- *
In C, the asterisk (*) symbol is used to declare a pointer variable. For example, int *ptr declares a pointer to an integer.
When you increment a pointer in C, it advances the pointer by the size of the type to which it points, which is known as ________.
- Looping
- Memory allocation
- Pointer arithmetic
- Typecasting
When you increment a pointer in C, it advances the pointer by the size of the type to which it points, and this operation is known as pointer arithmetic. It allows you to navigate through data structures in memory.
What is the significance of using pointers when working with structures in C?
- Pointers allow dynamic memory allocation.
- Pointers enable structures to be passed to functions efficiently.
- Pointers prevent data corruption in structures.
- Pointers simplify access to structure members.
Using pointers when working with structures in C is essential because they enable efficient access to structure members when they are passed to functions. This allows you to manipulate data inside structures without having to create copies of the entire structure.
How can a structure be passed to a function in C?
- By creating a copy inside the function
- By reference
- By using global variables
- By value
A structure can be passed to a function in C by reference (using a pointer or passing the address of the structure). This allows the function to modify the original structure's contents.
What is a pointer in C programming?
- A control structure in C
- A data type used for characters
- A function that returns values
- A variable that stores addresses
A pointer in C is a variable that stores the memory address of another variable. It's often used for dynamic memory allocation and accessing data indirectly.