In a large software project, certain code needs to be compiled only for debugging purposes. How can preprocessor directives be used to achieve this?
- By using 'ifdef' and 'ifndef'
- By using 'for' loops
- By using 'switch' statements
- By using 'while' loops
Preprocessor directives like 'ifdef' and 'ifndef' can conditionally include or exclude sections of code based on predefined conditions. This is often used to include debugging code only during debugging builds. Options b, c, and d are not related to preprocessor directives.
In C, a pointer is a variable that stores the ________ of another variable.
- Address
- Function
- Size
- Value
In C, a pointer stores the address of another variable. Pointers are used to work with memory addresses, allowing you to access and manipulate the data stored at that location.
When a file is opened in ________ mode, it is opened for both reading and writing in binary format.
- binary_rw
- r+b
- rb+
- rw
Opening a file in r+b mode in C allows for both reading and writing operations in binary format. The 'r' stands for read, and the 'b' indicates binary mode, making it suitable for combined read and write tasks.
What is the purpose of the strcpy function in C?
- Allocates memory for a new string
- Calculates the length of a string
- Compares two strings
- Copies one string to another
The strcpy function in C is used to copy one string into another. It does not calculate the length, compare strings, or allocate memory.
When using pointers in a C program, what does the 'dereferencing' operation do?
- Accesses the value stored at a memory address
- Allocates memory for a new pointer
- Increases the pointer's size
- Retrieves the memory address of a variable
Dereferencing a pointer in C means accessing the value stored at the memory location pointed to by the pointer. It allows you to work with the actual data.
How can you determine the size of an array in C?
- By counting the number of elements
- By using the 'size' function
- Using the 'length' keyword
- Using the 'sizeof' operator
You can determine the size of an array in C by using the 'sizeof' operator. It returns the size in bytes, so dividing it by the size of one element gives you the number of elements in the array.
In C, the ________ function is used to write a string to a file.
- write()
- fputstring()
- fwrite()
- fputs()
The correct option is fputs(). This function is used to write a string to a file in C, providing a convenient way to output a sequence of characters to the specified file.
In C, a structure member with a specified width is known as a ________.
- Bit Field
- Conditional Statement
- Enum Member
- Pointer Variable
In C, a structure member with a specified width is known as a bit field, allowing you to optimize memory usage by using a specific number of bits.
An array name in C essentially acts as a ________ to the first element of the array.
- container
- pointer
- reference
- variable
An array name in C essentially acts as a reference to the first element of the array, making it easy to access.
To allocate memory dynamically and initialize it to a specific value, the ________ function can be used in C.
- calloc()
- free()
- malloc()
- realloc()
In C, the "calloc()" function is used to dynamically allocate memory and initialize it to a specific value. It takes two arguments for the number of elements and the size of each element, allocating memory for an array.
What is the impact of using inline functions on the size of the compiled binary?
- It depends on the compiler
- Larger compiled binary
- No impact on the binary size
- Smaller compiled binary
Inline functions tend to reduce binary size because they replace function calls with code directly inserted at the call site. This can lead to more efficient code and smaller binary sizes.
The ________ statement is used to skip the rest of the loop's body and continue with the next iteration.
- break
- continue
- exit
- return
In C and many other programming languages, the 'continue' statement is used to skip the current iteration and move to the next iteration within a loop. It allows you to bypass the remaining code in the loop body.