In a program that processes large amounts of data, what strategy can be used to optimize the performance of loops?
- Loop branching optimization
- Loop indexing optimization
- Loop parallelization
- Loop unrolling
To optimize the performance of loops when processing large data, 'loop unrolling' can be used. Loop unrolling reduces loop overhead and can improve data processing speed.
The fread function in C is used to read data from a file and stores the data in the ________.
- Buffer
- Memory
- Stack
- Registers
The fread function in C reads data from a file and stores it in memory, making option b) "Memory" the correct answer.
In C, the ________ function is used to copy a specified number of characters from one string to another.
- memcpy()
- strcpy()
- strncat()
- strncpy()
In C, the strncpy() function is used to copy a specified number of characters from one string to another. Unlike strcpy(), it allows you to specify the maximum number of characters to copy, which helps prevent buffer overflows and enhances program security.
In C, a double pointer is a pointer that points to another ________.
- double
- int
- pointer
- variable
In C, a double pointer is a pointer that points to another pointer. It is used to store the address of a pointer variable.
A ________ allows multiple variables to share the same memory location.
- Function
- Pointer
- Structure
- Union
A union allows multiple variables to share the same memory location, making it useful for scenarios where different types of data need to occupy the same memory space.
In C, an array name acts as a ________ pointing to the first element of the array.
- label
- pointer
- reference
- variable
In C, an array name is a constant pointer that points to the address of the first element in the array.
How do you declare a pointer variable in C?
- Using the % operator
- Using the & operator
- Using the * operator
- Using the -> operator
In C, you declare a pointer variable using the * operator. For example, int *ptr; declares a pointer to an integer.
How does the 'extern' keyword affect the scope and lifetime of a variable in C?
- It doesn't affect the scope or lifetime of a variable.
- It extends the scope and lifetime of a variable.
- It extends the scope but reduces the lifetime of a variable.
- It reduces the scope but extends the lifetime of a variable.
In C, the 'extern' keyword extends the scope of a variable but reduces its lifetime. It allows a variable declared outside a function to be used within that function, but the variable's lifetime remains outside the function.
How are strings typically terminated in C?
- With a comma
- With a newline character
- With a null character ( ' ' )
- With a space character
Strings in C are typically terminated with a null character (' ') to indicate the end of the string.
In a program that processes large datasets, you notice that reading the data from a file is a performance bottleneck. Which file handling functions could help improve the performance?
- fread() and fwrite()
- fseek() and ftell()
- fprintf() and fscanf()
- fgetc() and fputc()
To improve performance when dealing with large datasets, using fread() and fwrite() for bulk reading and writing of data would be beneficial. The other options involve more granular or formatted I/O operations.