When we call the fopen function to open a file and we specific \"rb\" in the sec

Question

When we call the fopen function to open a file and we specific "rb" in the second parameter, which ONE of the following best describes what we're attempting to do? a. Create a new file, and use the fwrite function to write raw bytes into the file. b. Open an existing file for reading, and use the fread function to read raw bytes from the file. c. Open an existing file for reading, and use the fscanf function to read human-readable text from the file. d. Create a new file, and use the fprintf function to write human-readable text into the file. Which of the following are TRUE statements about why we might use bit manipulation in C? Select ALL correct responses. a. Packing information into bits can save file storage space. b. Packing information into bits can save memory space while the program is running. c. Packing information into bits can reduce transmission time of data over a network. d. Hardware devices often provide or receive information as bits packed within bytes. e. Error detection and correction algorithms often use bit manipulation. Assuming x, y, and z are all integer variables that have been initialized, which ONE of the following statements will compute the "bitwise AND" of the values in x and y, and store the result in z? a. z = x & y; b. z = x && y; c. z = &x; && &y; d. z & = x & y; Assuming x contains the binary value 10101010 and y contains the binary value 11001100, which ONE of the following statements is the value of the expression (x^y? a. 11101110 b. 10101010 c. 11001100 d. 11111111 e. 01100110 Assuming x contains the binary value 10101010 and y contains the binary value 11001100, which ONE of the following statements is the value of the expression (x | y? a. 10101010 b. 11001100 c. 11111111 d. 11101110 e. 01100110

Explanation / Answer

1. When we open a file in "rb" mode, it will just open the file for reading in binary format.
So, the answer is:
b. Open an existing file for reading and use the fread function to read raw bytes from the file.

2. Why to use bit manipulation in C?
b. Packing information into bits can save memory space while the program is running.
c. Packing information into bits can reduce transmission time of data over a network.

3. Computing bitwise AND of x, and y, and store the result in z.
a. z = x & y; //The bitwise AND operator is &.

4. x^y is x XOR y. That is 1 if either one of x or y bit is 1, and 0 if either both bits
are same.
So, 10101010 ^ 11001100 is:
10101010
11001100

01100110
So, the answer is: e. 01100110.

5. x | y is if there is atleast one 1 in relavent bits of x, and y, the resultant bit is 1,
and 0 otherwise.
So, 10101010 | 11001100 is:
10101010
11001100

11101110
So, the answer is: d. 11101110.

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