List comprehensions: Difference between revisions

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          +3         +4         +5         +5        +12        +13         +6         +8        +10         +8        +15        +17         +9        +12        +15        +12        +16        +20
 </pre></div>
+=={{header|C++}}==
+<lang C++>
+#include <vector>
+#include <cmath>
+#include <iostream>
+#include <algorithm>
+#include <iterator>
+void list_comprehension( std::vector<int> & , int ) ;
+int main( ) {
+   std::vector<int> triangles ;
+   list_comprehension( triangles , 20 ) ;
+   std::copy( triangles.begin( ) , triangles.end( ) ,
+	 std::ostream_iterator<int>( std::cout , " " ) ) ;
+   std::cout << std::endl ;
+   return 0 ;
+}
+void list_comprehension( std::vector<int> & numbers , int upper_border ) {
+   for ( int a = 1 ; a < upper_border ; a++ ) {
+      for ( int b = a + 1 ; b < upper_border ; b++ ) {
+	 double c = pow( a * a + b * b , 0.5 ) ; //remembering Mr. Pythagoras
+	 if ( ( c * c ) < pow( upper_border , 2 ) + 1 ) {
+	    if ( c == floor( c ) ) {
+	       numbers.push_back( a ) ;
+	       numbers.push_back( b ) ;
+	       numbers.push_back( static_cast<int>( c ) ) ;
+	    }
+	 }
+      }
+   }
+}
+This produces the following output:
+4 5 5 12 13 6 8 10 8 15 17 9 12 15 12 16 20
+</lang>
 =={{header|Clojure}}==