Basic calculator of PHP and basic calculator of PHP
Design a computing function that completes computation and verifies unreasonable data and provides error messages.
Rule: the first number and the second number cannot be blank.
If the operator is/, the second number cannot be 0.1
How to Use PHP code to write a
Basic Calculator1Topic content:Implement a small calculator with add and subtract and parentheses, where the input is not negative, and the input is all legal expressions.Personal analysis:1. Use stack to solve the problem and put the resulting temporary results into the stack2. Insert result into stack when the parentheses are encounteredExperience:1. For the addition and subtraction can be directly using
Implement a basic calculator to evaluate a simple expression string.The expression string may contain open ( and closing parentheses ) , the plus + or minus sign - , Non-negati ve integers and empty spaces .Assume that the given expression was always valid.Some Examples:"1 + 1" = 2 "2-1 + 2" = 3 "(1+ (4+5+2)-3) + (6+8)" = 23A basic
1. Title:Implement a basic calculator to evaluate a simple expression string.The expression string may contain open ( and closing parentheses ) , the plus + or minus sign - , Non-negati ve integers and empty spaces .Assume that the given expression was always valid.Some Examples:"1 + 1" = 2 "2-1 + 2" = 3 "(1+ (4+5+2)-3) + (6+8)" = 23
The title requirement is to implement a
Implement a basic calculator to evaluate a simple expression string.The expression string contains only non-negative integers,,, + - * , / operators and empty spaces . The integer division should truncate toward zero.Assume that the given expression was always valid.Some Examples:"3+2*2" = 7 "3/2" = 1 "3+5/2" = 5Note: don't use the eval built-in library function.Credits:Special thanks to @ts for adding th
Upgrade
Wizard
Convert the currency data type to decimal, so the following code:
Dim X as currency
After the upgrade, it will be changed:
Dim X as decimal
Date
Visual
The basic 6.0 date variable is stored internally in the double format and can be operated as a double type variable.
The date variable is stored as an IEEE 64-bit floating point number, which indicates the date from January 1, January
Upgrade Wizard
These statements are not automatically upgraded, so there will be an upgrade error marked with "(statement) is not supported" [(statement) not supported. For example, the following code:
A = varptr (B)
After the upgrade, it will be changed:
'Upgrade_issue: function varptr () is not supported
A = varptr (B)
This will also cause compilation errors.
File I/O
Visual
Basic 6.0 includes file
Upgrade
Wizard
These statements are not automatically upgraded, so there will be an upgrade error marked with "(statement) is not supported" [(statement) not supported. For example, the following code:
A = VarPtr (B)
After the upgrade, it will be changed:
UPGRADE_ISSUE: Function VarPtr () is not supported
A = VarPtr (B)
This will also cause compilation errors.
File I/O
Visual
Basic 6.0 includes file
Upgrade
Wizard
No special processing is required.
Clipboard
Visual
The Basic 6.0 Clipboard object provides access to the system Clipboard.
Visual Basic. NET
The Clipboard class allows you to place data on the system Clipboard and retrieve data from it. The new Clipboard class provides more functions and suppo
Upgrade
Wizard
The paramarray parameter in the process indicates an upgrade warning. For example, the following code:
Function myfunction (paramarray P () as variant)
'...
End Function
After the upgrade, it will be changed:
'Upgrade_warning: paramarray P was changed from byref to byval
Function myfunction (byval paramarray P () as object)
'...
End Function
Declared as any parameter
Visual
The parameter of the local API of
Upgrade
Wizard
Convert the Currency data type to Decimal, so the following code:
Dim x As Currency
After the upgrade, it will be changed:
Dim x As Decimal
Date
Visual
The Basic 6.0 Date variable is stored internally in the Double format and can be operated as a Double type variable.
The Date variable is stored as an IEEE 64-bit floating point number, which indicates the Date from January 1, January
The following Visual Basic 6.0 features are no longer supported by visual Visual Basic. NET.
A
· There are no equivalent objects in Visual Basic. NET for OLE container controls. Applica
provides additional functionality by using the referenced assembly. Ultimately, all frameworks use the. NET Framework 3.5 command line Visual Basic compiler (vbc.exe).
This article discusses the 3.5 and 4 compilers, the compilers that are included in the. NET Framework 3.5 and 4, respectively. The 3.5 compilers are versions that are provided with Visual Studio
visual| Create | controls | Arrays Create control arrays in visual Basic. NET and Visual C #. Net
Matthew A. Stoecker
Visual Studio Team
Microsoft Corporation
January 2002
Summary: This article describes how to create and manage an array of controls using
Matthew A. stoeckerVisual Studio teamMicrosoft CorporationJanuary 2002
Summary: This article describes how to use Visual Basic. NET and Visual C #. Net to create and manage control arrays. Directory
Introduction
Prerequisites
Create a project
Implementation set
Public control array
Create a public event handler
Test Item
Summary
Description, QT is qml to describe), and the Form1.cs file is the code that implements the function (so everyone should at least figure out a complete C # The program contains two parts: The design part of the Designer.cs file and the execution part of the Form1.cs file, of course, here we put the implementation of all in the Form1.cs inside, immediately will not be said in the Form1.cs inside the situation)??For more instructional videos and downloads, please pay attention to the following inf
.
Embed PHP code in HTML
In the front code of the calculator above, we can see that when the data is processed and delivered to the foreground, the data is displayed by writing the PHP code in the P tag. From here we can see how PHP is nested in HTML code.
The development here is the PHP code and HTML code nesting, data and page development together, what mode is useless.
Summarize
The case of the computer contains almost all the previous studies
Total accepted:14291 Total submissions:64507 difficulty:medium Implement a basic calculator to evaluate a simple expression string.The expression string contains only non-negative integers,,, + - * , / operators and empty spaces . The integer division should truncate toward zero.Assume that the given expression was always valid.Some Examples:"3+2*2" = 7 "3/2" = 1 "3+5/2" = 5Note:do not use the eval built-
Basic Calculator IIImplement a basic calculator to evaluate a simple expression string.The expression string contains only non-negative integers,,, + - * , / operators and empty spaces . The integer division should truncate toward zero.Assume that the given expression was always valid.Some Examples:"3+2*2" = 7 "3/2" =
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