交换价值 [英] SWAP VALUE
问题描述
大家好，
基本上我想要一个程序如何交换价值......我知道2方法1 ---
temp = a;
a = b;
b = temp;
2nd ----
a = a + b ;
b = ab;
a = ab;
如果你知道任何其他方法然后给我程序..
Pramod Sahgal
Pramod写道：
大家好，
基本上我想要一个程序如何交换价值...我知道2方法1 ---
temp = a;
a = b;
b = temp;
2nd ----
a = a + b;
b = ab;
a = ab;
如果你知道任何其他方法然后给我程序..
Pramod Sahgal
std :: swap（a，b）;
据推测它适用于任何类型a和b是。
在第二个你避免临时v ariable，但实际上是
如果temp的范围有限，它可能不存在于寄存器外的任何地方，所以你不会保存任何东西
秒。
第二个有重大问题。
如果a + b或ab有溢出会怎样？
有些人使用XOR做同样的事情，但XOR
对所有数字类型都不起作用。
< blockquote> 6月12日下午4:26，Ron Natalie< r ... @ spamcop.netwrote：
Pramod写道：
大家好，
基本上我想要一个程序如何交换价值...我知道2方法1 ---
temp = a;
a = b;
b = temp;
2nd ----
a = a + b;
b = ab;
a = ab;
如果你知道任何其他方法然后给我程序..
Pramod Sahgal
std :: swap（a，b）;
据推测，它针对a和b类型进行了优化。
在第二个你避免一个临时变量，但实际上
如果temp有足够的范围，它可能不存在于寄存器外的任何地方，所以你不是通过
秒保存任何东西。
第二个有重大问题。
如果a + +会发生什么b或ab有溢出吗？
有些人用XOR做同样的事情，但是XOR
甚至对所有数字类型都不起作用。
哥们我想要另一种方法......如果你有帖子就交换价值。
< blockquote> Pramod写道：
6月12日下午4:26，Ron Natalie< r ... @ spamcop.netwrote：
>>
std :: swap（a，b）;
据推测，它针对a和b类型进行了优化。在第二个中你避免使用一个临时变量，但实际上如果temp的范围有限，它可能不存在于寄存器外的任何地方，所以你不会通过
第二。
第二个有重大问题。
如果a + b或ab有溢出会怎样？
有些人用XOR做同样的事情，但XOR
对所有数字类型都不起作用。
哥们我想要另一个方法......如果你有帖子就交换价值。
Nice那里的男人（或加仑）...
那里有另一种方法。
-
[我的电子邮件中没有x']
我有权保持沉默
（并且应该尽可能多地使用它）
我打字的任何东西都可以用来对付我
在白痴法庭上
我有权利出错
（可能是我）
如果我不能提出自己的错误
我相信有人会为我提供它。
Hello to all of you,
basically i want a program how to swap value...i know 2 method 1st ---
temp=a;
a=b;
b=temp;
2nd----
a=a+b;
b=a-b;
a=a-b;
if u know any another method then give me program ..
Pramod Sahgal
Pramod wrote:Hello to all of you,
basically i want a program how to swap value...i know 2 method 1st ---
temp=a;
a=b;
b=temp;
2nd----
a=a+b;
b=a-b;
a=a-b;
if u know any another method then give me program ..
Pramod Sahgal
std::swap(a,b);
Presumably it is optimized for whatever the types a and b are.
In the second you avoid a temporary variable, but actually
if temp has limited enough scope, it might not exist anywhere
outside a register, so you''re not saving anything by the
second.
The second has SUBSTANTIAL problems.
What happens if the a+b or a-b have overflows?
Some people do the same thing with XOR, but XOR
doesn''t work on even all the numeric types.
On Jun 12, 4:26 pm, Ron Natalie <r...@spamcop.netwrote:Pramod wrote:Hello to all of you,
basically i want a program how to swap value...i know 2 method 1st ---
temp=a;
a=b;
b=temp;
2nd----
a=a+b;
b=a-b;
a=a-b;
if u know any another method then give me program ..
Pramod Sahgal
std::swap(a,b);
Presumably it is optimized for whatever the types a and b are.
In the second you avoid a temporary variable, but actually
if temp has limited enough scope, it might not exist anywhere
outside a register, so you''re not saving anything by the
second.
The second has SUBSTANTIAL problems.
What happens if the a+b or a-b have overflows?
Some people do the same thing with XOR, but XOR
doesn''t work on even all the numeric types.buddy i want another method...to swap value if u have then post.
Pramod wrote:On Jun 12, 4:26 pm, Ron Natalie <r...@spamcop.netwrote:>>
std::swap(a,b);
Presumably it is optimized for whatever the types a and b are.
In the second you avoid a temporary variable, but actually
if temp has limited enough scope, it might not exist anywhere
outside a register, so you''re not saving anything by the
second.
The second has SUBSTANTIAL problems.
What happens if the a+b or a-b have overflows?
Some people do the same thing with XOR, but XOR
doesn''t work on even all the numeric types.
buddy i want another method...to swap value if u have then post.
Nice manners there guy (or gal)...
And there was another method there.
--
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I have the right to remain silent
(and should probably use it as much as possible)
Anything I type can and will be used against me
in a court of idiocy
I have the right to be wrong
(and probably am)
If I can not furnish my own wrongness
I''m sure someone will provide it for me.
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