- ѳ .
, ѳ:
< >::= < >|< >|
< >
<>::=< >|< >
)
:
< >::= begin{<>}2end;
ѳ:
< >::={{<>}2}
) ( )
:
< >::=if< >then<>
:
if flag = true then { flag }
begin
iA:= iA + 10; { iA }
flag:= false;
end;
ѳ:
< >::=if (< >)<>
< >::=<>< ><>
:
if (flag == 1) // flag
{
iA = iA + 10;
flag = 0;
}
) ( )
:
< >::=if< >then<>else<>
:
if flag = true
iA:= iA * 10;
else
begin
iA:= iA + 10;
flag:= true;
end;
ѳ:
< >::=if (< >)<>;else<>
:
if (flag == 1)
{
iA = iA * 10;
flag = 0;
};
else
{
iA = iA + 10;
flag = 1;
}
) ( /)
:
< >::=case< >of{< >}0
{else<>}01 end
< >::={< {..<>}0 {,}0 }1: <>
:
case cB of { cB }
A: iA:= iA +10;
B, C: iA:= iA +20;
D: iA:= iA +30;
else iA:= iA +100;
end;
ѳ:
< >::=switch (< >){{ case< > }1
{default: <>}01 }
< >::=<R - >: <> break;
:
switch cB
{
case A: {iA = iA +10; break;}
case B: {iA = iA +20; break;}
case C: {iA = iA +30; break;}
default: iA = iA +100;
}
) ( repeat-until / do-while)
:
< >::=repeat <>until< >
:
iMounth:= 1; { iMounth }
repeat { iAccount }
iAccount:= iAccount + iAccount/100;
iMounth:= iMounth + 1;
until iMounth<=12;
ѳ:
< >::=do<>while(< >)
|
|
|
:
iMounth = 1;
do
{
iAccount = iAccount + iAccount/100;
iMounth = iMounth + 1;
}
while (iMounth<=12);
) ( while-do)
:
< >::=while< >do<>
:
iMounth:= 1;
while iMounth <= 12 do
begin
iAccount:= iAccount + iAccount / 100;
iMounth:= iMounth + 1;
end;
ѳ:
< >::=while(< >)<>
:
iMounth = 1;
while (iMounth <= 12)
{
iAccount = iAccount + iAccount/100;
iMounth = iMounth + 1;
}
) ( for-step-do)
:
< >::=for < >to|downto
<> {step<> }01do<>
:
for iMounth:= 1 to 12 do
begin
iAccount:= iAccount + iAccount / 100;
if iMounth > 6 then
iAccount:= iAccount + iAccount * 0.05;
end;
ѳ:
< >::=for ({< >}01;
{< >}01;{< >}01){<>}01
:
for (iMounth = 1; iMounth <= 12; iMounth = iMounth + 1)
{
iAccount = iAccount + iAccount / 100;
if (iMounth > 6)
iAccount = iAccount + iAccount * 0.05;
}
, , , .
then else , , .
( ) .
() , .
, , .
.
, .
, ().
, ' .
1. ( ) ѳ: , .
2. ѳ, .
4. ѳ, (.18). .
18
| ˳ 1 | -25 | |||||
| ѳ | > | |||||
| -7 | ||||||
| ˳ 1 | -37 | |||||
| ѳ | = = | -8 | ||||
| < | -77 | |||||
| -77 | ||||||
| ѳ | + | -10 | ||||
| > | ||||||
| ѳ | ˳ 1 | -18 | ||||
| = = | ||||||
| -2 | ||||||
| ѳ | ˳ 1 | -255 | ||||
| + | -52 | |||||
| ѳ | < | -2 | ||||
| ˳ 1 | -87 | |||||
| ѳ | < | -8 | ||||
| ˳ 1 | -24 | |||||
| ѳ | > | |||||
| -7 | ||||||
| < | -6 | |||||
| -10 | ||||||
| ѳ | ˳ 1 | -128 | ||||
| > | -1 | |||||
| -12 | ||||||
| ѳ | ˳ 1 | -15 | ||||
| = | -57 | |||||
| -57 | -10 | |||||
| ѳ | + | -3 | ||||
| + | -12 | |||||
| ѳ | = | -21 | ||||
| -21 | ||||||
| ˳ 1 | -43 | |||||
| ѳ | = | |||||
| ˳ 1 | -92 | |||||
| ѳ | < | |||||
| > | ||||||
| ѳ | + | |||||
| -73 |
|
|
|
:
- ();
- 0 1 .
, , .
n- (sizeof( ) >= n >= 0) , 1, . , iA :
iBitA:= iA and (1 shl 5) () iBitA = iA & (1 << 5) (ѳ).
iBitA 0, iA 0, , 1.
, , , , .
:
= =
| iA = 2510 = 1 10012 | iBitA = iA and (1 shl 4) = 16 => 1 | => 1<>0 => iA<>iB |
| iB = 910 = 0 10012 | iBitB = iB and (1 shl 4) = 0 => 0 |
, , . , λ, , ົ:
|
|
|
:
+
iA = 2510 = 110012
iB = 910 = 010012
iSum = 3410 = 1 000 1 02
iSum 1 , :
1) iSum = 0, iSum = 010 = 02
2) iSum = iSum or (1 shl 1), iSum = 210 = 000 1 02
3) iSum = iSum or (1 shl 5), iSum = 3410 = 1 000 1 02
˳, . .
, , 0, , , 1, , . , ົ.
:
˳ 1
iA = 2510 = 110012
iA 1 = 2410 = 1100 0 2
1) iA = iA xor (1 shl 0), iA = 2410 = 1100 0 2
iA = 2410 = 110002
iA 1 = 2310 = 1 0111 2
1) iA = iA xor (1 shl 0), iA = 2510 = 1100 1 2
2) iA = iA xor (1 shl 1), iA = 2710 = 110 1 12
3) iA = iA xor (1 shl 2), iA = 3110 = 11 1 112
4) iA = iA xor (1 shl 3), iA = 2310 = 1 0 1112
19
| + | - | = | > | < | + | ||||||
1 , ?
2 , , , ?
3 , ?
4 .
5 .
6 .
7 ?
8 , ?
9 .
10 ?
11 ?
˳: [1]; [3]; [6]; [7].
