What is a spectrum analyzer?
What will be an ideal response?
A spectrum analyzer scans the radio frequency spectrum (2.4 GHz or 5 GHz for WLANs) and can locate potential sources of interference. Spectrum analyzers are passive receivers: they do not make any changes to the signal but instead display it in a way that makes it easy to analyze. Spectrum analyzers usually display the raw and unprocessed signal information such as frequency, voltage, power, period, and the shape of the RF "wave." The most common spectrum analyzer measurements are modulation, distortion, and noise.
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When subfolders are written out in a file path, they are separated from folders with a(n) backslash symbol.
Answer the following statement true (T) or false (F)
Rewrite the class so that it throws appropriate exceptions instead of returning -1 as an error code. Write test code that attempts to withdraw and deposit invalid amounts and catches the exceptions that are thrown.
A method that returns a special error code can sometimes cause problems. The caller might ignore the error code or treat the error code as a valid return value. In this case it is better to throw an exception instead. The following class maintains an account balance and returns a special error code. ``` { private double balance; public Account() { balance = 0; } public Account(double initialDeposit) { balance = initialDeposit; } public double getBalance() { return balance; } // returns new balance or -1 if error public double deposit(double amount) { if (amount > 0) balance += amount; else return -1; // Code indicating error return balance; } // returns new balance or -1 if invalid amount public double withdraw(double amount) { if ((amount > balance) || (amount < 0)) return -1; else balance -= amount; return balance; } } ``` This solution throws a NegativeAmount and InsufficientBalance exception. It is worth pointing out to the students the problems that would occur if negative account balances were desirable.
The structured design approach is also known as ____.
A. top-down design B. bottom-up design C. object design D. stepwise updating
An atomic data type is a set of atomic data having identical properties.
Answer the following statement true (T) or false (F)