C,Delphi,PHP 基础语法对比
说明C(区分大小写)Delphi(不区分大小写)PHP(区分大小写)整型变量的定义 char a = 'a';/*8位有符号*/int a=10;/*16位有符号*/
unsigned int a = 10;/*16位无符号*/
short a = 10;/*16位有符号*/
unsigned short a = 10;/*16位无符号*/
long a = 10;/*32位有符号*/
unsigned long a = 10;/*32位无符号*/
I: ShortInt;{8位有符号}
I: Byte;{8位无符号}
I: SmallInt;{16位有符号}
I: Word;{16位无符号}
I: Integer;{32位有符号}
I: Cardinal;{32位无符号}
I: Int64;{64位有符号}
$i = 10;/*变量以$开头*/实型变量的定义float a = 1.0;/*4字节*/
double a = 1.0;/*8字节*/
long double a = 1.0;/*10字节*/a: Single;{4字节}
b: Real48;{6字节}
c: Double;{8字节}
d: Extended;{10字节}$a =3.14;字符变量的定义char a = 'a';/*1字节*/a: Char;{1字节}
a: WideChar;{2字节}$a = 'a';固定长度字符串无a: ShortString;$a = 'a';动态字符串无a: AnsiString;{一般为String}$a = 'Hello!';以NULL结束的字符串char a[] = "Hello!";a: PChar;无1字节布尔变量/*任何1字节数*/a: Boolean;任何变量都可以加,减,乘,浮点除+,-,*,/+,-,*,/+,-,*,/整除a = 3 / 2;/*运算符两边都是整型*/a := a div b;{a,b都是整型}$a = 3 / 2;取模a = a % b;a := a mod b;$a =$a % $b;赋值a = b;a := b;$a = $b;比较if (a == 12) ...;if a = 23 then ...;if ($a == 23) ...;不等于if (a != 23) ...;if a <> 23 then ...;if($a != 23) ...;小于,大于,小于等于,大于等于<,>,<=,>=<,>,<=,>=<,>,<=,>=逻辑与if (a && b) ...;if(a = 2) and (b = 3) then ...;if ($a && $b) ...;逻辑或if (a || b) ...;if (a = 2) or (b = 2) then ...;if ($a || $b) ...;逻辑非if (!a) ...;if not(a = 2) then ...;if (!$a) ...;数组定义int a = {0};a: array of Integer;$MyArray = array(1,2,3,4);记录类型typedef struct{
int i;
double d;
}MyRes;Type
MyRec = record
i:Integer;
d: Double;
end; 指针int *a;a: ^Integer;判断语句if (a == 2)
{ /*为真执行*/
}else{
/*为假执行*/
}; if a = 2 then
begin
{为真执行}
end else begin
{为假执行}
end;
if ($a == 2)
{ /*为真执行*/
}else{
/*为假执行*/
};多重判断switch (expr){
case expr1:
DoSomething;
break;
case expr2:
default: exprN;
} case Variable of
101: DoSomething;
102:
begin
end;
103: DoAnotherthing;
else DoTheDefault;
end;
switch (expr){
case expr1:
DoSomething;
break;
case expr2:
default: exprN;
}for循环 for(expr1;expr2;expr3){
DoSomething;
}
for i := 10 to 20 do
begin
end;
for i := 20 downto 10 do
begin
end; for(expr1;expr2;expr3){
DoSomething;
}
while循环(先判断)while(expr1)
{
}while(a =30) do
begin
end;while(expr1)
{
}while循环(后判断)do
{
}while(expr1);repeat
inc(c);
until c > 100; do
{
}while(expr1);跳出循环break; continue;break; continue;break; continue;
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