Problem 1
Mark the following statements as true or false. a. In a counter-controlled while loop, it is not necessary to initialize the loop control variable. b. It is possible that the body of a while loop may not execute at all. c. In an infinite while loop, the while expression (the decision maker) is initially false, but after the first iteration it is always true. d. The while loop: \(j=0\) while \((\mathrm{j}<10)\) \(\mathrm{j}++;\) terminates if \(j>10\) e. A sentinel-controlled while loop is an event-controlled while loop whose termination depends on a special value. f. \(\quad\) A loop is a control structure that causes certain statements to execute over and over. g. To read data from a file of an unspecified length, an EOF-controlled loop is a good choice. h. When a while loop terminates, the control first goes back to the statement just before the while statement, and then the control goes to the statement immediately following the while loop.
Problem 3
What is the output of the following \(\mathrm{C}++\) code? int count \(=10\); double sum \(=0\); while (count > 8) $$\begin{array}{l}\text { Sum = sum + pow (count, 2.0) } \\ \text { count- - ; }\end{array}$$\\} cout \(<<\) sum \(<<\) endl:
Problem 5
When does the following while loop terminate? \(\mathrm{ch}=^{\prime} \mathrm{D}^{\prime} ;\) \(\mathrm{while}\left(^{\prime} \mathrm{A}^{\prime}<\mathrm{ch} \& \& \mathrm{ch}<=\mathrm{z}^{\prime}\right)\) \(\mathrm{ch}=\operatorname{static}_{-} \mathrm{cast}<\mathrm{char}>\left(\mathrm{static}_{-} \mathrm{cast}<\mathrm{int}>(\mathrm{ch})+1\right)\)
Problem 7
Suppose that the input is \(25361816-1 .\) What is the output of the following code? int num; int sum; \(\operatorname{cin}>>\operatorname{sum}\) num \(=\) sum;
Problem 8
Suppose that the input is 25361816 -1. What is the output of the following code? int num; int sum; cin \(>>\) num; sum \(=\) num; while (num \(!=-1)\) \\{ sum \(=\) sum \(+\) num; cin \(>>\) num; } cout \(<<\) "Sum \(="<<\) sum \(<<\) endl;
Problem 15
What is the output of the following program segment? int count \(=5\) while \((--\text { count }>0)\) cout \(<<\) count \(<<\) " \("\) cout \(<<\) endl
Problem 16
What is the output of the following program segment? int count \(=5\) while \((\operatorname{count}-->0)\) cout \(<<\) count \(<<\) " \("\) cout \(<<\) endl
Problem 17
What is the output of the following program segment? int count \(=1 ;\) while \((\operatorname{count}++<=5)\) cout \(<<\) count \(\star(\text { count }-2)<<\cdots\) " cout \(<<\) endl
Problem 18
What type of loop, such as counter-control and sentinel-control, will you use in each of the following situations? a. Sum the following series: \(1+(2 / 1)+(3 / 2)+(4 / 3)+(5 / 4)\) \(+\ldots+(10 / 9)\) b. Sum the following numbers, except the last number: 17,32,62,48,58,-1 c. A file contains an employee's salary. Update the employee's salary.
Problem 24
Write a for statement to add all the multiples of 3 between 1 and 100 .
