When a string is declared as a character array, the string must be terminated with a ________.
- comma
- null character
- semicolon
- space
In C, a string is a sequence of characters terminated by a null character (' '). This null character signifies the end of the string.
What is the result of comparing two strings using the '==' operator in C?
- It compares the ASCII values of the first characters
- It compares the content of the strings
- It compares the length of the strings
- It compares the memory addresses of the strings
In C, the '==' operator compares the memory addresses of the strings, not their content.
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.
Which function would you use to compare two strings lexicographically in C?
- strcat()
- strcmp()
- strcpy()
- strlen()
You would use the strcmp() function to compare two strings lexicographically in C. It returns 0 if the strings are equal, a positive value if the first string is greater, and a negative value if the second string is greater.
Using the ________ function, the file pointer can be moved to the end of a file.
- fseek()
- rewind()
- ftell()
- fsetpos()
The correct option is fseek(). This function is used to set the file position indicator to a specific position within the file. When the SEEK_END constant is provided as the reference point, it moves the file pointer to the end of the file, allowing operations like appending data.