Cs 38 Ch 6

Front 1

The flow of control that programmers use to complete jobs with this pattern is called _____ or _____.

Back 1

looping or repetition

Front 2

one execution of the loop body

Back 2

iteration

Front 3

one or more statements that could cause the loop condition to evaluate to false (and thus end the looping)

Back 3

loop update

Front 4

the event that causes the loop condition to evaluate to false

Back 4

loop termination condition

Front 5

If the loop condition never evaluates to false, the loop body is executed continuously, without end. This is called _____ or _____.

Back 5

an endless loop or an infinite loop

Front 6

How can we stop an infinite loop?

Back 6

Abort the program

Front 7

20678: Given an int variable k that has already been declared, use a while loop to print a single line consisting of 88 asterisks. Use no variables other than k.

Back 7

k = 0;

while (k < 88)

{

System.out.print("*");

k = k + 1;

}

Front 8

20679: Given an int variable n that has already been declared and initialized to a positive value, use a while loop to print a single line consisting of n asterisks. Use no variables other than n.

Back 8

while (n != 0)

{

System.out.print("*");

n = n - 1;

}

Front 9

21000: Given an int variable n that has already been declared, write some code that repeatedly reads a value n until at last a number between 1 and 10 (inclusive) has been entered. ASSUME the availability of a variable, stdin, that references a Scanner object associated with standard input.

Back 9

do

{

n = stdin.nextInt();

}

while (n>10 || n < 1);

Front 10

21001: Given a string variable response that has already been declared, write some code that repeatedly reads a value from standard input into response until at last a Y or y or N or n has been entered. ASSUME the availability of a variable, stdin, that references a Scanner object associated with standard input.

Back 10

do

{

response = stdin.next();

}

while (!response.equals("Y") && !response.equals("y") && !response.equals("N") && !response.equals("n"));

Front 11

21208: Given a String variable named line1 and given a Scanner reference variable stdin that has been assigned a reference to a Scanner object, read the next line from stdin and save it in line1.

Back 11

line1 = stdin.nextLine();

Front 12

21216: Given a Scanner reference variable named input that has been associated with an input source consisting of a sequence of strings and two int variables, count and longest, write the code necessary to examine all the strings in the input source and determine how long the longest string (or strings are). That value should be assigned to longest; the number of strings that are of that length should be assigned to count.

Back 12

count = 0;

longest =0;

String myString = new String();

while (input.hasNext())

{

myString = input.next();

if (myString.length() == longest)

count++;

else if (myString.length() > longest)

{

longest = myString.length();

count = 1;

}

}

Front 13

20680: Given int variables k and total that have already been declared, use a while loop to compute the sum of the squares of the first 50 counting numbers, and store this value in total. Thus your code should put 1*1 + 2*2 + 3*3 + … + 49*49 + 50*50 into total. Use no variables other than k and total.

Back 13

total = 0;

k = 1;

while (k <= 50)

{

total += (k*k);

k = k+1;

}

Front 14

20682: Given an int variable k that has already been declared, use a do…while loop to print a single line consisting of 53 asterisks. Use no variables other than k.

Back 14

k = 0;

do

{

System.out.print("*");

k++;

}

while (k < 53);

Front 15

20685: Given an int variable n that has been initialized to a positive value and, in addition, int variables k and total that have already been declared, use a while loop to compute the sum of the cubes of the first n whole numbers, and store this value in total. Use no variables other than n, k, and total and do not modify the value of n.

Back 15

k = n;

total = 0;

while (k > 0)

{

total = total + k*k*k;

k--;

}