Starting Out With Visual Basic (8th Edition)
8th Edition
ISBN: 9780135204658
Author: Tony Gaddis, Kip R. Irvine
Publisher: PEARSON
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Expert Solution & Answer
Chapter 4, Problem 1FTE
Explanation of Solution
a.
Given code:
'if the condition is true
If intX > 100
'Set the result
lblResult.Text = "Invalid Data"
'End the statement
End If
Error in the statement:
The “Then” keyword is missing in the “If” statement...
Explanation of Solution
b.
Given code:
'Create a variable "str" and set the value
Dim str As String = "Hello"
'Create an integer variable "intLength"
Dim intLength As Integer
'set the value of "intLength" as the length of "str"
intLength = Length(str)
Error in the statement:
The last statement should read “intLength = str.Length”...
Explanation of Solution
c.
Given code:
'if the condition is true
If intZ < 10 Then
'set the value of result
lblResult.Text = "Invalid Data"
Error in the statement:
The “End If” statement is missing in the above snippet.
Corrected statement:
'if the condition is true
If intZ < 10 Then
Explanation of Solution
d.
Given code:
'Create a variable "str" and set the value
Dim str As String = "123"
'if the condition is true
If str.IsNumeric Then
'set the result
lblResult.Text = "It is a number."
'end if condition
End If
Error in the statement:
The If statement should read: “If IsNumeric(str) Then”
Corrected statement:
'Create a variable "str" and set the value
Dim str As String = "123"
'if the condition is true
If IsNumeric(str) Then
'set the result
lblResult...
Explanation of Solution
Given code:
'start select case
Select Case intX
'case 1
Case < 0
'set the result
lblResult. Text = “Value too low”
'case 2
Case > 100
'set the result
lblResult. Text = “Value too high”
'else case
Case Else
'set the result
lblResult. Text =”Value just right”
'end select
End Select
Explanation:
The above code snippet is used to execute select statements. In the code,
- Start a select case
- Case 1 “<0”
- Set the result as “Value too low”
- Case 2 “>100”
- Set the result as “Value too high”
- Else Case
- Set the result as “Value just right”
- Case 1 “<0”
- End select statement.
Error in the statement:
The “Is” keyword is missing in the “Select Case” statements...
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
The next problem concerns the following C code:
/copy input string x to buf */
void foo (char *x) {
char buf [8];
strcpy((char *) buf, x);
}
void callfoo() {
}
foo("ZYXWVUTSRQPONMLKJIHGFEDCBA");
Here is the corresponding machine code on a Linux/x86 machine:
0000000000400530 :
400530:
48 83 ec 18
sub
$0x18,%rsp
400534:
48 89 fe
mov
%rdi, %rsi
400537:
48 89 e7
mov
%rsp,%rdi
40053a:
e8 di fe ff ff
callq
400410
40053f:
48 83 c4 18
add
$0x18,%rsp
400543:
c3
retq
400544:
0000000000400544 :
48 83 ec 08
sub
$0x8,%rsp
400548:
bf 00 06 40 00
mov
$0x400600,%edi
40054d:
e8 de ff ff ff
callq 400530
400552:
48 83 c4 08
add
$0x8,%rsp
400556:
c3
This problem tests your understanding of the program stack. Here are some notes to
help you work the problem:
⚫ strcpy(char *dst, char *src) copies the string at address src (including
the terminating '\0' character) to address dst. It does not check the size of
the destination buffer.
• You will need to know the hex values of the following characters:
Consider the following assembly code for a C for loop:
movl $0, %eax
jmp
.L2
.L3:
addq
$1, %rdi
addq
%rsi, %rax
subq
$1, %rsi
.L2:
cmpq
%rsi, %rdi
jl
.L3
addq
ret
%rdi, %rax
Based on the assembly code above, fill in the blanks below in its corresponding C
source code. Recall that registers %rdi and %rsi contain the first and second, respectively,
argument of a function. (Note: you may only use the symbolic variables x, y, and
result in your expressions below do not use register names.)
long loop (long x, long y)
{
long result;
}
for (
}
return result;
__; y--) {
In each of the following C code snippets, there are issues that can prevent the compiler
from applying certain optimizations. For each snippet:
Circle the line number that contains compiler optimization blocker.
⚫ Select the best modification to improve optimization.
1. Which line prevents compiler optimization? Circle one: 2 3 4 5 6
Suggested solution:
⚫ Remove printf or move it outside the loop.
Remove the loop.
• Replace arr[i] with a constant value.
1 int sum (int *arr, int n) {
2
int s = 0;
3
for (int i
=
0; i < n; i++) {
4
5
6
}
7
8 }
s = arr[i];
printf("%d\n", s);
return s;
234206
2. Which line prevents compiler optimization? Circle one: 2 3 4 5 6
Suggested solution:
Move or eliminate do_extra_work() if it's not necessary inside the loop.
Remove the loop (but what about scaling?).
⚫ Replace arr[i] *= factor; with arr[i] = 0; (why would that help?).
1 void scale (int *arr, int n, int factor) {
5
6 }
for (int i = 0; i < n; i++) {
rr[i] = factor;
do_extra_work ();
Chapter 4 Solutions
Starting Out With Visual Basic (8th Edition)
Ch. 4.2 - Prob. 4.1CPCh. 4.2 - In the following If Then statement, assume that...Ch. 4.2 - Do both of the following If Then statements...Ch. 4.2 - Prob. 4.4CPCh. 4.3 - Prob. 4.5CPCh. 4.4 - The following If Then ElseIf statement has...Ch. 4.4 - Prob. 4.7CPCh. 4.6 - Prob. 4.8CPCh. 4.7 - Prob. 4.9CPCh. 4.7 - Prob. 4.10CP
Ch. 4.8 - Convert the following If Then Elself statement...Ch. 4.10 - Prob. 4.12CPCh. 4.10 - Prob. 4.13CPCh. 4.10 - Write a Boolean expression that equals true when a...Ch. 4.10 - Prob. 4.15CPCh. 4.10 - Prob. 4.16CPCh. 4 - A (n) _______structure allows a program to execute...Ch. 4 - A (n) _______operator determines if a specific...Ch. 4 - Boolean expressions can only be evaluated as_____...Ch. 4 - A (n)_______is a Boolean variable that signals...Ch. 4 - Prob. 5FIBCh. 4 - Prob. 6FIBCh. 4 - A(n)________ If statement is an If statement that...Ch. 4 - _______operators connect two or more relational...Ch. 4 - Prob. 9FIBCh. 4 - Prob. 10FIBCh. 4 - Prob. 11FIBCh. 4 - Prob. 12FIBCh. 4 - Prob. 13FIBCh. 4 - Prob. 14FIBCh. 4 - Prob. 15FIBCh. 4 - Prob. 16FIBCh. 4 - Prob. 17FIBCh. 4 - Prob. 18FIBCh. 4 - ________ is the process of inspecting input values...Ch. 4 - Prob. 20FIBCh. 4 - Prob. 21FIBCh. 4 - Prob. 1TFCh. 4 - T F: It is not possible to write Boolean...Ch. 4 - Prob. 3TFCh. 4 - T F: Clicking on a radio button selects it and...Ch. 4 - T F: Radio buttons that are placed inside a group...Ch. 4 - Prob. 6TFCh. 4 - Prob. 7TFCh. 4 - Prob. 8TFCh. 4 - Prob. 9TFCh. 4 - Prob. 10TFCh. 4 - Prob. 1MCCh. 4 - This statement can cause other program statements...Ch. 4 - Prob. 3MCCh. 4 - This statement is like a chain of If statements....Ch. 4 - When placed at the end of an IfThenElself...Ch. 4 - When an If statement is placed inside another If...Ch. 4 - This operator connects two Boolean expressions...Ch. 4 - This operator connects two Boolean expressions...Ch. 4 - Prob. 9MCCh. 4 - This operator connects two Boolean expressions...Ch. 4 - When determining whether a number is inside a...Ch. 4 - When determining whether a number is outside a...Ch. 4 - Prob. 13MCCh. 4 - This method attempts to convert a value to...Ch. 4 - Prob. 15MCCh. 4 - Describe the difference between the If Then ...Ch. 4 - In an IfThenElseIf statement, what is the purpose...Ch. 4 - What is a flag and how does it work?Ch. 4 - Briefly describe how the And operator works.Ch. 4 - Briefly describe how the Or operator works.Ch. 4 - How is the Xor operator different from the Or...Ch. 4 - Prob. 7SACh. 4 - How is the OrElse operator different from the Or...Ch. 4 - Why are the relational operators called...Ch. 4 - Prob. 2WDTCh. 4 - Why does Visual Studio automatically indent them...Ch. 4 - Prob. 4WDTCh. 4 - Prob. 1FTECh. 4 - Prob. 1AWCh. 4 - Write an IfThen statement that assigns 0 to intX...Ch. 4 - Write an IfThen statement that multiplies...Ch. 4 - Prob. 4AWCh. 4 - Write an IfThen statement that sets the variable...Ch. 4 - Write an IfThenElse statement that assigns 1 to...Ch. 4 - The string variable strPeople contains a list of...Ch. 4 - Write an IfThen statement that prints the message...Ch. 4 - Write an IfThen statement that prints the message...Ch. 4 - Prob. 10AWCh. 4 - Prob. 1PCCh. 4 - Roman Numeral Converter The Roman Numeral...Ch. 4 - Fat Percentage Calculator Create an application...Ch. 4 - Weekly Temperatures with Validation Programming...Ch. 4 - Software Sales Software companies often offer...Ch. 4 - Sailboat Race Ranking Programming Challenge 7 in...Ch. 4 - Pay Per Click Advertising Revenue Many Web sites...Ch. 4 - Speed of Sound The following table shows the...Ch. 4 - Prob. 9PCCh. 4 - Name Formatting Create an application that lets...Ch. 4 - Prob. 11PCCh. 4 - Museum Tours Write a program that lets the user...Ch. 4 - Prob. 13PCCh. 4 - Mass and Weight Scientists measure an objects mass...Ch. 4 - Book Club Points Serendipity Booksellers has a...Ch. 4 - Body Mass Index Program Enhancement In Programming...Ch. 4 - Magic Dates The date June 10, 1960, is special...
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