Exercise 4   A number, a, is a power of b if it is divisible by b and a/b is a power of b. Write a function called is_power that takes parameters a and b and returns True if a is a power of b. Note: you will have to think about the base case.

60 points Write a function which takes one parameter int num, and prints out a countdown timer with minutes and seconds separated by a colon (:). It should print out one line for each second elapsed and then pause one second before printing out the next line. After it has done all of this, it should call a special function ringAlarm () to sound an alarm. A few things to note: - You can assume that calling the function sleepytime () makes the program pause for one second - You can assume that calling the function ringAlarm () makes the program sound an alarm - It should count down from num minutes:zero seconds to zero minutes:zero seconds - Your function must have the following signature: void timer (int num) You do not need to demonstrate calling this function from main(). You don't need to format the output nicely; the below is acceptable output for calling this function when num is 10: 10:0 9:59 9:58 //...and so on, all the way down to: 9:1 9:0 8:59 8:58 //..and so on, all the way…

Which of the following statements about testing are always true. A. If a test fails, there must necessarily be a defect in the executed code. B. If a test passes, there cannot be a defect in any code executed by the test, but there could be a defect elsewhere in the function. C. If a test is unsound, that test passing or failing doesn't tell us whether or not a defect exists. D. All of the above are true

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