C,Delphi,PHP 基础语法对比[转载]
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: arrayof 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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