Some what interesting comparison

This is a discussion on Some what interesting comparison within the Tech Board forums, part of the Community Boards category; When writing my paper concerning Pascal and C I noticed the following: For the "Hello World" program the Pascal executeable ...

  1. #1
    & the hat of GPL slaying Thantos's Avatar
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    Some what interesting comparison

    When writing my paper concerning Pascal and C I noticed the following:

    For the "Hello World" program the Pascal executeable was 42484 bytes and the C executeable was 4822 bytes.
    Using the time command the real was .003s for each of the 5 invocations of the C executeable but was .001s for each of the 5 invocations of the Pascal executeable.

    C code:
    Code:
    #include <stdio.h>
    
    int main (void)
    {
      printf("Hello World\n");
      return 0;
    }
    Pascal code:
    Code:
    begin
      writeln('Hello World');
    end.
    The other program was showing how the subroutine definations are(or can be) arranged in C and Pascal.
    Pascal Executable 46212, C Executable 5012.
    time: C: .003s for each of 5 invocations. Pascal: .001 for 4 of the 5 invocations, .002 for the 5th.

    C code
    Code:
    #include <stdio.h>
    void p1 (int);
    void p2 (int);
    void p3 (int);
    
    int main (void)
    {
      int x;
      x = 5;
      printf("%d ",x);
      p1(x);
      return 0;
    
    }
    
    void p3 (int x)
    {
      printf("%d\n", x*x);
    }
    
    void p1 (int x)
    {
      x = x + 1;
      printf("%d ", x);
      p2(x);
    }
    
    void p2 (int x)
    {
      x = x * 2;
      printf("%d ", x);
      p3(x);
    }
    Pascal code
    Code:
    procedure p3 ( x : integer);
      begin
        writeln(x*x)
      end;
    
    procedure p2 ( x : integer);
      begin
        x := x * 2;
        write(x, ' ');
        p3(x)
      end;
    
    procedure p1 ( x : integer);
      begin
        x := x + 1;
        write (x, ' ');
        p2(x)
      end;
    
    var
      x : integer;
    begin
      x := 5;
      write (x, ' ');
      p1(x)
    end.
    While I'm sure most of you don't care I was suprised on the size of the exectuable and the speed of writting to the screen.

    Enviroment: Debian, PII 667 Mhz
    Pascal Compiler: Free Pascal Compiler version 1.0.4 [2001/08/31] for i386
    C Compiler: gcc version 2.95.4 20011002 (Debian prerelease)

  2. #2
    and the hat of wrongness Salem's Avatar
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    Try comparing when you use puts() for your constant strings instead of printf(). printf() has to parse your string one char at a time looking for % conversions.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  3. #3
    & the hat of GPL slaying Thantos's Avatar
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    with puts() in the hello world it ran in all 5 times in .002 seconds. Executable size was 4816 bytes.

  4. #4
    PC Fixer-Upper Waldo2k2's Avatar
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    another thing to check for is whether both or neither are outputting optimized code. That could throw your results if one is and the other isn't.
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  5. #5
    & the hat of GPL slaying Thantos's Avatar
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    Both were unoptimized.

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