swaping two numbers

sharma.s.prakash · 25-08-2011, 02:16 PM

swaping two numbers with the use of third variable

PHP Code:


			
$num=0;

$num1=10;

$num2=20;

echo $num1;

echo"\n";

echo $num2;

$num=$num1;

$num1=$num2;

$num2=$num;

echo"\n";

echo $num1;

echo"\n";

echo $num2;

Code:

and without using third variable

PHP Code:


			
$num1=10;

$num2=20;

echo $num1;

echo"\n";

echo $num2;

$num1=$num1+$num2;

$num2=$num1-$num2;

$num1=$num1-$num2;



echo"\n";

echo $num1;

echo"\n";

echo $num2;

Code:

kaman · 26-08-2011, 05:28 PM

Very useful.

Though both examples give same result, I prefer using first approach. The second approach requires extra processes for addition and subtraction.

What do you think???

sharma.s.prakash · 29-08-2011, 10:02 AM

yah first one is quit good but second one is maths trick!!!!!!!!

kaman · 29-08-2011, 10:39 AM

Agree. the second one is the magic of mathematics. I tried with negative numbers and with decimal too. Always works fine.

sharma.s.prakash · 29-08-2011, 04:57 PM

It takes a big penalty if you do not enjoy Mathematics

kaman · 30-08-2011, 09:09 AM

How is the penalty given? Clarify.

sharma.s.prakash · 30-08-2011, 09:41 AM

It is a pharse : AGAR MATH SAMAJH AA JAYE TO MAJA NAHI TO MATH HAI EK SAJA

kaman · 30-08-2011, 11:57 AM

Okay....

sharma.s.prakash · 30-08-2011, 12:39 PM

thanks you have taken such an interest.

25-08-2011, 02:16 PM	#1
sharma.s.prakash Senior Member Join Date: Aug 2011 Posts: 110	swaping two numbers swaping two numbers with the use of third variable PHP Code: `$num=0; $num1=10; $num2=20; echo $num1; echo"\n"; echo $num2; $num=$num1; $num1=$num2; $num2=$num; echo"\n"; echo $num1; echo"\n"; echo $num2;` Code: 10 20 20 10 and without using third variable PHP Code: `$num1=10; $num2=20; echo $num1; echo"\n"; echo $num2; $num1=$num1+$num2; $num2=$num1-$num2; $num1=$num1-$num2; echo"\n"; echo $num1; echo"\n"; echo $num2;` Code: 10 20 20 10

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26-08-2011, 05:28 PM	#2
kaman Senior Member Join Date: Aug 2011 Posts: 111	Very useful. Though both examples give same result, I prefer using first approach. The second approach requires extra processes for addition and subtraction. What do you think???

29-08-2011, 10:02 AM	#3
sharma.s.prakash Senior Member Join Date: Aug 2011 Posts: 110	yah first one is quit good but second one is maths trick!!!!!!!!

29-08-2011, 10:39 AM	#4
kaman Senior Member Join Date: Aug 2011 Posts: 111	Agree. the second one is the magic of mathematics. I tried with negative numbers and with decimal too. Always works fine.

29-08-2011, 04:57 PM	#5
sharma.s.prakash Senior Member Join Date: Aug 2011 Posts: 110	It takes a big penalty if you do not enjoy Mathematics

30-08-2011, 09:09 AM	#6
kaman Senior Member Join Date: Aug 2011 Posts: 111	How is the penalty given? Clarify.

30-08-2011, 09:41 AM	#7
sharma.s.prakash Senior Member Join Date: Aug 2011 Posts: 110	It is a pharse : AGAR MATH SAMAJH AA JAYE TO MAJA NAHI TO MATH HAI EK SAJA

30-08-2011, 11:57 AM	#8
kaman Senior Member Join Date: Aug 2011 Posts: 111	Okay....

30-08-2011, 12:39 PM	#9
sharma.s.prakash Senior Member Join Date: Aug 2011 Posts: 110	thanks you have taken such an interest.