Visual Basic Programming Exercises: Chapter 5 Lists and Loops

5.3 Introduction to Loops: The Do While Loop a posttest loop 

 

40181

 

Given an Integer variable  n that has been initialized to a positive value and, in addition, Integer 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. 

k = 0
total = 0
Do While (k <= n)
 total = (total + (k*k*k))
 k += 1
Loop

 

40178

Given an Integer variable  k that has already been declared, use a pretest Do While loop to print a single line consisting of 88 asterisks. Use no variables  other than k. 

Do While k < 88
    Console.Write("*")
    k+= 1
Loop

 

40179

Given an Integer variable  n that has already been declared and initialized to a positive value, use a pretest Do While loop to print a single line consisting of n asterisks. Use no variables  other than n.

 

 Do While (n > 0)
 Console.Write("*")
 n -= 1
Loop

 

 

40387

 

Write a statement that increments the value of the int variable  total by the value of the int variable  amount. That is, add the value of amount to total and assign the result to total. 

total += amount

 

40180

Given Integer variables  k and total that have already been declared, use a pretest Do While loop to compute the sum of the squares of the first 50 whole 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. 

k = 1
total = 0
Do While (k <= 50)
 total = (total + (k*k))
 k += 1
Loop

 

40379

 

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 counting numbers, and store this value in total. Thus if n equals 4, your code should put 1*1*1 + 2*2*2 + 3*3*3 + 4*4*4 into total. Use no variables  other than n, k, and total. Do NOT modify n. 

k = 0
total = 0
Do While (k <= n)
 total = (total + (k*k*k))
 k += 1
Loop

40378

 

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. 

k = 1
total = 0
Do While (k <= 50)
 total = (total + (k*k))
 k += 1
Loop

 

 

5.4 The Do Until and For...Next Loops

 

40182

 

Given an Integer variable  k that has already been declared, use a posttest Do While loop to print a single line consisting of 53 asterisks. Use no variables  other than k. 

Do
    Console.Write("*")
    k+= 1
Loop While k < 53

 

40183

 

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

Do
    Console.Write("*")
    n -= 1
Loop While n > 0

 

40184

 

Given int variables  k and total that have already been declared, use a posttest Do While loop to compute the sum of the squares of the first 50 whole 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. 

k = 1
total = 0
Do While (k <= 50)
 total = (total + (k*k))
 k += 1
Loop

 

40174

 

Given an int variable  k that has already been declared, use a for loop to print a single line consisting of 97 asterisks. Use no variables  other than k. 

For k = 1 To 97
Console.Write("*")
Next

 

40288

  Write a for loop that computes the following sum: 5+10+15+20+...+485+490+495+500. The sum should be placed in a variable  sum that has already been declared and initialized to 0. In addition, there is another variable , num that has also been declared. You must not use any other variables .

 

 sum = 0
For num = 5 to 500 step 5
 sum += num
Next

 

 

40185

 

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 do...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. 

total = 0
For k = 0 to n
 total += k*k*k
Next

 

40385

 

Assume the int variables  i, lo, hi, and result have been declared and that lo and hi have been initialized.

Write a for loop that adds the integers between lo and hi (inclusive), and stores the result in result.

Your code should not change the values of lo and hi. Also, do not declare any additional variables  -- use only i, lo, hi, and result. 

result = 0
For i = lo To hi
 result += i
Next

 

40374

  Given int variables  k and total that have already been declared, use a for 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.

 

total = 0

For k = 0 To 50

total = total + k*k

Next

 

 

40375

 

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 for loop to compute the sum of the cubes of the first n whole numbers, and store this value in total. Thus if n equals 4, your code should put 1*1*1 + 2*2*2 + 3*3*3 + 4*4*4 into total. Use no variables  other than n, k, and total. 

total = 0

For k = 1 to n

total += k*k*k

Next

 

40502

 

Assume the integer variables  counter, low, high, and result have been declared and that low and high have been initialized.

Write a For loop that adds the integers between low and high (inclusive), and stores the result in result.

Your code should not change the values of low and high. Also, do not declare any additional variables  -- use only counter, low, high, and result. 

result = 0

For counter = low to high

result = result + counter

Next

 

40176

 

Given int variables  k and total that have already been declared, use a for loop to compute the sum of the squares of the first 50 whole 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. 

total = 0

For k = 0 to 50

total = total + k*k

Next

 

40177

 

Given an Integer variable  n that has been initialized to a positive value and, in addition, Integer variables  k and total that have already been declared, use a For 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. 

total = 0

For k = 1 to n

total += k*k*k

Next

 

40187

 

Assume the int variables  i,lo, hi, and result have been declared and that lo and hi have been initialized. Assume further that result has been initialized to the value 0.

Write a for loop that adds the integers between lo and hi (inclusive), and stores the result in result.

Your code should not change the values of lo and hi. Also, do not declare any additional variables  -- use only i,lo, hi, and result. 

For i = lo To hi

result += i

Next

 

40223

 

Give that two Integer variables , total and amount have been declared, write a loop that reads non-negative values into amount and adds them into total. The loop terminates when a value less than 0 is read into amount. Don't forget to initialize total to 0.

To read a value into amount use a method, getNum() that we provide for you a class named TC:
   amount = TC.getNum();

total = 0
amount = 0

Do

    total += amount

    amount = TC.getNum()

Loop Until (amount < 0)