Qt Vs C sharp Vs Visual Basic的基础知识
文章信息
Contents |
简介
Nokia在宣布和微软一起研发Windows Phone后，为开发者群提供了另一个Windows Phone平台。经过这次公告后，虽然Nokia的开发者群体明显变大了，但Nokia同时也要求Qt开发人员学习全新的Windows Phone平台。这篇文章的理念是非常基础的，我将非常高兴如果能有积极的开发人员和Wiki用户为这篇文章补充更多的内容。这篇文章描述了Qt, C# (读作C Sharp) 和 Visual Basic在编程语言方面的差异。C# 和Visual Basic是Windows Phone开发支持的两种语言。Qt 和 C#都是从C++中派生出的，所以它们的基本语法非常相似。
注解
Visual Basic
'This line is commented
C#
// This line is commented
/* This line block is
Commented */
Qt
与C#相似
// This line is commented
/* This line block is
Commented */
数据类型
Visual Basic
Boolean
Byte, SByte
Char
Short, UShort, Integer, UInteger, Long, ULong
Single, Double
Decimal
C#
bool,
byte, sbyte
char
short, ushort, int, uint, long, ulong
float, double
decimal
Qt
bool,
char,
short,
int,
long,
float,
double
变量声明
Visual Basic
Dim <variable name> as <datatype> = [<default Value>]
for example
Dim TotalAmount as long=123456
C#
<datatype> <variable name> = [<default value>]
// example
long Totalamount = 123456
Qt
<datatype> <variable name> = [<default value>]
// Example
long Totalamount = 123456
If….ElseIf…EndIf
Visual Basic
If <expression> Then
‘Do something
ElseIf <expression> Then
‘Do something
Else
‘Do something
End If
C#
if (<expression>)
{
// do something if expression is true
}
elseif(<expression>)
{
// do something if expression is true
}
else
{
// do something if expression is false
}
Qt
if (<expression>)
{
// do something if expression is true
}
else if(<expression>)
{
// do something if expression is true
}
else
{
// do something if expression is false
}
Switch.. Case结构
Visual Basic
Select Case <data>
Case <value1>
'Do something
Case <value2>
'Do something
Case Else
'Do something if non of above case matched
End Select
C#
switch (data)
{
case <value1>:
//Do something
break;
case <value2>:
//do something
break;
default:
//do something if non of obove case matched.
break;
}
Qt
switch (data)
{
case <value1>:
//Do something
break;
case <value2>:
//do something
break;
default:
//do something if non of obove case matched.
break;
}
循环
Visual Basic
While <expression>
'do something
End While
Do While <expression>
'do something
Loop
Do Until <expression>
'do something
Loop
For <variable>=<startValue> To <endValue> Step <increments>
'do something
Next
C#
while (<expression>)
{
// do something
}
do
{
// do something
}while(expression);
for(<variable>=<startValue>;<expression>;<increment>)
{
// do something
}
Qt
while (<expression>)
{
// do something
}
for(<variable>=<startValue>;<expression>;<increment>)
{
// do something
}
Try....Catch
Visual Basic
Try
'do something
catch ex As Exception
'do something
End Try
C#
try
{
// do something
}
catch (Exception ex)
{
//do something
}
Qt
try
{
// do something
}
catch (e)
{
//do something
}
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