How to do an ascending sort

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:confused:Below is my code for a mini project, I would like to know how to do an ascending sort to sort total_day_wind in ascending order.

C++

cout << "Please enter a specific value : ";
cin >> wind_value;

	for(i=0; i<dataSize; i++)
	{
	   if(data[i].date().day() != currentDay)
	   {
	      total_day_wind /= ave_day_data;
	      if (wind_value <= total_day_wind)
								
	cout << "Average WindSpeed equal or above " << wind_value << " at Month " << data[i].date().month() << " on Day " << data[i].date().day()  << " is " << total_day_wind << " knots " << endl;							
		currentDay = data[i].date().day();
		total_day_wind = 0.0;
		ave_day_data = 0;			
	   }
	   total_day_wind += data[i].windspeed();
	   ave_day_data++;				 		
	}
	system("pause");
	total_day_wind = 0.0;
	ave_day_data = 0;

Posted 16-Jun-10 6:00am

valtron78

Updated 16-Jun-10 6:03am

Moak

v2

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Aescleal · Answer 1 · 2010-06-16T08:34:00

Solution 2

total_day_wind looks like either a float or double to me. It's a bit trivial to sort a single value...

If you've got a collection of wind speeds somewhere and you want to sort them into ascending order then use std::sort:

std::vector<double> wind_speeds;

// Much clever code to populate wind_speeds

std::sort( wind_speeds.begin(), wind_speeds.end() );

Cheers,

Ash

Edited as yet again I forgot to escape angle brackets

Posted 16-Jun-10 8:34am

Aescleal

Updated 16-Jun-10 10:08am

v2

Comments

valtron78 16-Jun-10 22:40pm

Does it mean I do a sort first before I start counting the total?

Aescleal 17-Jun-10 5:47am

Does it matter? I have no idea what your code's trying to achieve so I'm afraid I can't answer that question.

Hans Dietrich · Answer 2 · 2010-06-16T08:15:00

Solution 1

The typical way to do this is by using the C++ runtime qsort function.

Another quickie way is to populate a hidden, sorted listbox (the item data is the index into your array). After all data strings have been added, you have a sorted list.

Posted 16-Jun-10 8:15am

Hans Dietrich

Comments

Aescleal 16-Jun-10 14:40pm

Reason for my vote of 1
Yeuch. If you're using C you don't touch qsort with a bargepole. std::sort will give at least as good performance as qsort and is usually better (std::sort can inline the comparison which in qsort has to be through a function pointer).