ASP. NET Learning Note 1

Grammar rules

To define a variable specification:

Variable definition: Use front + underline + literal words to avoid conflicts with C # keywords

int I_age

Double D_weight

Double D_height

Local variables

int _age

Double _weight

Double _height

Integers into strings

_age. ToString ()

String variable integer

String str_a = "", Str_b = "30";

int i_a, I_b;

I_a = Convert. ToInt16 (str_a)

(I_a + i_b). ToString ();

Integer variable character

Char chr_a;

Chr_a = Convert.tochar (65)

Line break <br/>

C # Data types

String Str_result;

Str_result = Str_name + "This year" + S_age. ToString () + "old <br/>" +

"is more than 30 years old:" + b_outageline;

int 32 bit

Short 16 bit

Double value: 15-16 digits after the decimal point

Float single-precision floating-point f_weight = 67.5f

Boolean b_outageline Ture or False

B_outageline = s_age > 30;

DateTime Dt_birthday;

Dt_birthday = Convert.todatetime ("1901-1-2");

Loop statement:

int i_start = 65;

for (int i=0; i < 6; i++) {

Chr_a = Convert. ToChar (I_start);

Response.Write (chr_a + "<br/>");

I_start + +;

}

Array:

Declares an array int[] A;

Create an array of 5 elements

A = new Int[5]

int [] A = new int[5]

The + assignment can be defined directly: int [] b = new int [] {1,2,3,4,5,6,7} subscript is 0-6

double [] da_a;

da_a = new Double [4] {56.34,55.33}

string [] stra_a = new string [4]

Assignment Operators :

a+= b; equivalent to A=a+b;

a%=5; A= a%5; Take the remainder

x=a++ + b+c; Equivalent to: x=a+b+c; a=a+1;

X=++a + B + C; Equivalent to: a=a+1; X= A+b+c;

A-=b;

A*=b;

A/=b;

number of daffodils : the sum of 3 powers of three digits of a number equals itself

int I_unit, I_ten,i_cen

for (int i = +; i<999; i++)

{i_unit = i% 10;

I_ten = (I/10)%10;

I_cen = i/100;

if (Math. Pow (i_unit,3) + Math.pow (i_ten,3) + Math.pow (i_cen,3) = i)

{

Str_result + = i + ",";

I_count + +;

}

}

Continue jump out of this loop and perform the Next loop

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ASP. NET Learning Note 1