Answered: Hello, I have some problems with this…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

Hello, I have some problems with this code.

It says:

"Main.scala:1: error: expected class or object definition
def extend(p: Long): Long = {
^
Main.scala:21: error: expected class or object definition
def ok(x: Long): Boolean = {
^
2 errors

Could you please help me fix it?

Code：

def extend(p: Long): Long = {
// Count the number of 1's in the payload
var count = 0
for (i <- 0 until 63) {
if ((p & (1L << i)) != 0) {
count += 1
}
}
// Set the parity bit to 0 or 1 depending on whether the number of 1's is even or odd
if (count % 2 == 0) {
p | (1L << 63)
} else {
p & ~(1L << 63)
}
}

def ok(x: Long): Boolean = {
// Count the number of 1's in the extended payload
var count = 0
for (i <- 0 until 64) {
if ((x & (1L << i)) != 0) {
count += 1
}
}
// Return true if the number of 1's is even and false if it is odd
count % 2 == 0
}