C Programming Language MCQ Exercise 429 Jan 2025 | 4 min read 1. Which of the following is the right way to pass a pointer to the function that accepts float as an argument and returns the int?
Explanation: The correct answer is b. The syntax for declaring a pointer to the function is return_type(*pointer_name)(parameter_list). The declaration of fptr as a pointer to function accepts float as an argument, and it returns int. 2. What is the output for the following code?
Explanation: The correct answer is a. The malloc function is assigned to 15 bytes of the string, and "Hello, World!" is copied over using strcpy. The size of the memory block is converted to 25 bytes by the realloc function, allowing strcat to append a "C" to the string. After that "Hello, World! C" is printed by the printf function. 3. If file is not already present, which of the following creates a fopen function modes file and opens the file for reading and writing?
Explanation: The correct answer is d. Using w+ mode, a file can be opened for both reading and writing to file. If the file does not exist, this mode will create a new file. 4. What is the output of the below-following code?
Explanation: The correct answer is c. All members of the union are united in memory because they share a common place of memory. The information in the shared memory address will be modified when a value is assigned to the member, which affects the value of other members 5. How to dynamically allocate memory for an array of 10 integers in C?
Explanation: The correct answer is b. To allocate the memory dynamically, malloc function is used in C. The total number of bytes to be allocated must be passed as an argument to malloc. 6. What does the code that follows below result in ?
Explanation: The correct answer is a. The factorial of 5 is 120. 7. What does the code that follows below result in ?
Explanation: The correct answer is a. The macro 'SQUARE(x)' is defined as '(x * x)'. When 'SQUARE(a + 1)' is expanded, it becomes '(a + 1 * a + 1)' because a is 3 here which is evaluated as ((3+1) * (3+1)). Therefore, the answer is 16. 8. Which keyword from the following option will indicate to the compiler that it would be better to use code for the function instead of a function call to reduce the overhead of the function call?
Explanation: The correct answer is c. The inline keyword will tell the compiler to replace a function call with the actual code of the function to reduce the function call overhead. 9. What does the code that follows below result in ?
Explanation: The correct answer is a. The & operator is used for bitwise AND operation. 4 is equal to 0100 and 9 is equal to 1001 in binary format. Next TopicC-programming-language-mcq-exercise-5 |
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