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amonsch
amonsch
Last Activity: Aug 6 '09, 07:39 PM
Joined: Nov 19 '08
Location: Northern Europe
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  • amonsch
    started a topic Pointer Swap local vs. global func, whats the difference?
    in C

    Pointer Swap local vs. global func, whats the difference?

    Hi,

    does anyone know what the difference is between:

    Code:
    #include <iostream>

using std::cout; 
using std::endl;

void func( int *p1, int* p2 )
{
	p2 = p1;
}

int main(int argc, char* argv[]) {
	int* p2;
	int* p1 = new int;
	
	func(p1, p2);
	
	cout << "P1 Address: " << p1 <<
    ...
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    • amonsch
      replied to Using friend classes
      in C
      hm..

      maybe :
      Code:
      using namespace std;
      could help you. Or could you give us the compiler message ?

      ---
      amonsch
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      • amonsch
        replied to Modifying data in file
        in C
        Code:
        fstream modData("Department1.txt",ios::out || ios::in || ios::binary);
        you need to use the bitwise inclusive or-operator ( | ) not the relational or-operator( || )

        ---
        amonsch
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        • amonsch
          replied to to Use close(int) from< unistd.h > in QT
          in C
          maybe.

          you should try including stdio.h and using

          FILE * fopen ( const char * filename, const char * mode )
          int fclose ( FILE * stream )

          EDIT:
          but if you are using Qt you should definitely use an object of the QFile class.

          ---
          amonsch
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          • amonsch
            replied to How do explicit casts affect program performance ?
            in C
            @weaknessforcat s

            Wow, your snippet knocked me almost off my seat :)
            BUT, after i played a little bit with the code it seems to me that this behaviour is c++ related, because the Code below is analog to yours only written in C and shows the expected output.
            Hmm.. do you have an explanation ?

            P.S.
            it is a little bit off topic and sorry for my poor english.

            Thanks for all replies!...
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            Last edited by amonsch; Nov 21 '08, 07:25 PM. Reason: typo in closing code tag

              Leave a comment:

            • amonsch
              started a topic How do explicit casts affect program performance ?
              in C

              How do explicit casts affect program performance ?

              So as you all can see i would like to know how an explicit cast influences the performance of a program.

              Thank you!
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