sort

[syed123]

I need to sort a string, for example string s="A0,A2,A1,A3" where s is a input string, and the required output is "A0,A1,A2,A3". How do i do it? i tried using sort function but couldn't get the required result

[Anon777]

#include <iostream>
#include <algorithm>
using namespace std;

int main()
{
string a[]={"A0","A2","A1","A3"};
sort (a,a+4);
for (int i=0;i<4;i++){
cout << a[i]<< endl;
}
return 0;
}
You need to get data to array of strings and than sort it

[vlad from moscow]

You can create an array of pointers and sort it. Then rewrite the original character array into the destination array. Here is the corresponding code block

	{
		char s[] = "A0,A2,A1,A3";
		char * p[] = { s, s + 3, s + 6, s + 9 };

		std::sort( std::begin( p ), std::end( p ),
			[]( char *a, char *b ) { return ( std::strncmp( a, b, 2 ) < 0 ); } );

		char t[sizeof( s )];
		char *q = t;

		std::for_each( std::begin( p ), std::end( p ),
			           [&]( char *a )
		               {
						   std::strncpy( q, a, 2 );
						   q += 2;
						   *q++ = ',';
		              } );
		*--q = '\0';
		std::cout << t << std::endl;
	}

I testes it and it works.

[syed123]

Thanks every one.