.


:




:

































 

 

 

 


Select Case

3

:
, case.

 

, .

 

( 5) ( ). . .

 

.

.

, .

.

 

VB.NET If :

If X < 0 Then Console.WriteLine("Number must be positive!")

If-Then And, Or Not. , .

If Then

' VB.NET (0 )

End If

Else:

If Then

' VB.NET (0 )

Else

' VB.NET (0 )

End If

 

:

If result > 48 Then Console.WriteLine(result is >48)

Else Console.WriteLine(result is <48)

End If

Else Elseif:

 

If Then

'

Elseif Then

'

Elself Then

'

Else

'

End If

If-Then Exit Do Exit For. Exit Do Exit For, VB.NET , Loop Next ( ).

If-Then. , . , Risk :

If income < 100000 Then

Dim risk As String = "too much risk"

Else

Dim risk As String = "love to make a deal"

End If

Console.WriteLine("Your risk level is " & Risk)

 

:

The name 'risk' is not declared.

risk , ! : , .

, , . (short curcuiting). , foo , bar:

If foo And bar Then...

VB.NET - 1, VB . Microsoft And Or AndAlso OrElse, :

If foo AndAlso Then...

Select Case

Elself VB.NET Select Case, . :

Dim a As Integer

Select Case a

Case 90

Console.WriteLine("A")

Case 80

Console. WriteLine("B")

Case 70

Console.WriteLine("C")

Case Else

Console.WriteLine("You fail")

End Select

, :

Select Case yourChoice

Case 1 To 9

'

Case -1. 0

'

End Select

 

 

1. X, Y, Z . 1, X, Y, Z, - .

 

2. X=LN(X+2.5) :

X(+1)=LN(X()+2.5), k=0,1,...

, () (+1) , 10^(-4). , [,].

 

3. ()

å = (1+^2/4^2 ), ( - )

=1

, 10^(-5).

 

4.

1, <1

Q = 2, 1<=<2

3, 2<=<3

4, 3<=

1

1= - ====

\/+1

2=-1/(+b^2) b1=COS x

a3=-b3*b2 b2=SIN x+COSx

a4=b1+b3 b3=IxI

x .

 

5. , =10^(-4).

 

:

(-1)^n*^n /N!

 

6. , . , 0, 3,2 1 , , - .

 

7. 50 . .

 

8. N>0, N . , .

 

9. , 0 ( ). .

 

10. f(x)=0,

2ax+|a-1| >0

e^x

f(x)= =========

(1+a^2)-1 .

 

11. ,, (=0). ax^2+bx+c=0. , .

 

12. y (y>0) - (, , , 20- 1901, 1900 ).

 

13.

(max(x,y,z))^2-2^x*min(x,y,z)

u=

max (x,y,z)/min(x,y,z)

 

x,y,z- .

 

14. , SIN COS [0,PI/2], y=sin x .

 

15. ,, , >=>=. ,, .

 

16. 1, 1, 1, 2, 2, 2. , 1+1y=c1 2+2y=2, , , .

 

17. 30 . , , . .

 

18. (x,y). , , .

 

19. , N 3. 3, , - .

 

20.

()

2^(2n+1)

S= å

2n+1

n=1

=0.001 .

 

21. . , ax^2+bx+c , a=trunc(c mod2+ 5\/ 0c), b=trunc(a div 5 0c+c^2).

 

22. a, b, c (a^2<>0). , ax^2+bx+c . , .

 

23. a,b,c m. a<b<c>m, .

 

24. x y. x y , . , 0.5.

 

25. x y. [0.5;2.5], 10 . x y .

 

26. x, y z. , (1;3).

 

27. a b. , - .

 

28. a, b c. , .

 

29. a, b c. , a>b> a<b<c. .

 

30. a, b c. , a>b>c, , .

 

 



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