int i = 0;
char ch;
for (i = 0; i <= 10; i++) { // Normally we know how many iterations we want, even if it is dynamic
Label1->Text = i;
for (ch = ‘a’; ch <= ‘z’; ch++) {
Label2->Text = ch;
}
}
i = 0;
while (i <= 5) { // Normally, we don’t know how many iterations, like reading a file or a web page
Label1->Text = i;
i = i + 2;
}
var
ch: Char;
I: Integer;
begin
for I := 1 to 1000 do
begin
Label1.Text := InttoStr(I);
for ch := ‘a’ to ‘z’ do // This is a nested loop
Label2.Text := ch; // It will count through the alphabet 1000 times
end;
I:= 0;
while I < 5 do
begin
Label2.Text := ‘I is less than 5′;
I := I +1;
// Inc(I);
end;
end;
< Previous Next >
a := 3;
b := 4;
c := 5;
if a > b then
Label1.Text := ‘c is greater than b’
else if b = 2 then
Label1.Text := ‘b is equal to 2′
else if b < c then
Label1.Text := ‘b is less than c’
else if b <> c then
Label1.Text := ‘b is not equal to c’
else if a + b = c then
Label1.Text := ‘a + b is equal to c’
else
Label1.Text := ‘a and b are not greater b or c’
< Previous Video Next Video >
// Check for even or odd
if (5 / 3 == 9) // Test condition
{
// If the condition is true then do this
Label1->Text = “Even”;
}
else {
Label1->Text = “Odd”;
}
< Previous Video Next Video >
The full code is below, and here are the two theams of the video:
The “for” loop. Used to do something several times. The $i counts and in our case the $decimals tells the computer how many times to do it.
for ($i=1; $i < $decimals; $i++) { // The code to execute goes here. } The “if” and “else” statements if ($i = 1 )Actual code from the video
for ($i=1; $i < $decimals; $i++)
{
}
$pi_calc = 4 * $pi_calc;
$this->Label1->Caption = $pi_calc;
// pi = 3.14
// pi = 4 * (1 – 1/3 + 1/5 – 1/7. . . )
Variables in PHP use the “$‘. If we define a variable, then we pick a name for it and then put the $ in front of it. So if our variable was LastName, we would define it in PHP as $LastName;
We can then assign it a value by: $LastName = “Smith”; Some other examples from the video are as follows.
$a = 2;
$b = 3.4;
$c = $a + $b; // Adding numbers
$firstName = “John”; // Storing strings of text
$lastName = “Smith”;
$fullName;
$fullName = $firstName . $lastName; // Add the text together
$this->Label1->Caption = $fullName;
Delphi Tutorial Code:
var
i: Integer; // 1, 2, 3, -1, -2, -3
d: real; // 1.2, 3.4, -6.7
s: string; // store text
begin
i := 5;
d := 56.34;
s := ‘Hello There’;
Label1.Text := FormatFloat(‘###,###.##’, d); //IntToStr(i); StrToInt(Edit1.Text)
end;
Numbers
// Integer data types :
Byte; // 0 to 255
ShortInt; // -127 to 127
Word; // 0 to 65,535
SmallInt; // -32,768 to 32,767
LongWord; // 0 to 4,294,967,295
Cardinal; // 0 to 4,294,967,295
LongInt; // -2,147,483,648 to 2,147,483,647
Integer; // -2,147,483,648 to 2,147,483,647
Int64; // -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// Decimal data types :
Single; // 7 significant digits, exponent -38 to +38
Currency; // 50+ significant digits, fixed 4 decimal places
Double; // 15 significant digits, exponent -308 to +308
Dec4 : Extended; // 19 significant digits, exponent -4932 to +4932
Strings
Char; // Holds a single character, small alphabet
WideChar; // Holds a single character, International alphabet
AnsiChar; // Holds a single character, small alphabet
shortString; // Holds a string of up to 255 Char’s
String; // Holds strings of Char’s of any size desired
AnsiString; // Holds strings of AnsiChar’s any size desired
WideString; // Holds strings of WideChar’s of any size desired
C++ Tutorial Code:
int a; // Integer 1, 2, 3, -1, -2
a = 5; // After creating the space, put something in it
double b = 5.7; // Create the space that can hold decimals.
double c = 9.5;
char t = ‘h‘; // hold a character
String u = “Hello There“; // hold a String of characters
Label1->Text = u;
| Name | Description | Size | Range |
|---|---|---|---|
| char | Character or small integer. | 1byte | signed: -128 to 127 unsigned: 0 to 255 |
|
short int |
Short Integer. | 2bytes | signed: -32768 to 32767 unsigned: 0 to 65535 |
| int | Integer. | 4bytes | signed: -2147483648 to 2147483647 unsigned: 0 to 4294967295 |
| long int | Long integer. | 4bytes | signed: -2147483648 to 2147483647 unsigned: 0 to 4294967295 |
| bool | Boolean value. It can take one of two values: true or false. | 1byte | true or false |
| float | Floating point number. | 4bytes | +/- 3.4e +/- 38 (~7 digits) |
| double | Double precision floating point number. | 8bytes | +/- 1.7e +/- 308 (~15 digits) |
| long double | Long double precision floating point number. | 8bytes | +/- 1.7e +/- 308 (~15 digits) |
| wchar_t | Wide character. | 2 or 4 bytes | 1 wide character |
