How to ascending or descending numbers in the array without using < and > symbols in C++?

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Hi,
I want to Ascend or descend numbers in the array without using

and

symbols. And also don't use predefined functions like sort() and so on...

Give me some solutions to solve this problem.

What I have tried:

I tried with different methods, But I couldn't find any way without using < and > symbols.

Posted 9-Jul-18 6:48am

Piraisudan

Updated 9-Jul-18 21:03pm

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Patrice T 9-Jul-18 14:22pm

What is your problem with using < or > ?

3 solutions

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Rick York · Answer 1 · 2018-07-09T07:23:00

Solution 1

You can subtract two numbers and then test the sign of the result. A negative value means the second was larger than the first. You can determine the sign by testing the most significant bit - if it is set then it is a negative number. That can be done by masking off all other bits and comparing with zero using '==', so there is no greater than or less than comparison.

Posted 9-Jul-18 7:23am

Rick York

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[no name] 9-Jul-18 14:02pm

+5. What I think to remember, there is also a std::signbit method finally available

CPallini 10-Jul-18 3:05am

5.

John R. Shaw · Answer 2 · 2018-07-09T09:09:00

Solution 3

Here is a quick method that makes no assumptions about the size of int, because the size is implementation dependent. The only assumption is that a byte is 8-bits.

bool isLess(int n1, int n2)
{
	const int mask = 1 << ((sizeof(int)<<3)-1);
	int dif = (n1-n2);
	return ((dif & mask) != 0);
}

Posted 9-Jul-18 9:09am

John R. Shaw

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CPallini 10-Jul-18 3:07am

5.

CPallini · Answer 3 · 2018-07-09T21:03:00

Solution 4

C++

#define LESS <

:-D

Posted 9-Jul-18 21:03pm

CPallini