Some help with make my programs faster

This is a discussion on Some help with make my programs faster within the C++ Programming forums, part of the General Programming Boards category; I made some programs at my house and they run find but I trying them out on my schools computer ...

  1. #1
    Registered User Sshakey6791's Avatar
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    Question Some help with make my programs faster

    I made some programs at my house and they run find but I trying them out on my schools computer and it runs slow. any tips on how I can make my codes better so that it runs the same for most computer?
    "Blood you have thirsted for -- now, drink your own!"
    (Dante)

  2. #2
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    Maybe your computer at school doesn't have enough memories for your programs.

  3. #3
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    My tip to make your code faster: change your algorithm.

    Without any info on the code, there's nothing more I can say.

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    Can you show some of your codes? Maybe someone will fix it for u out of the goodness of there heart.

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    First, make sure it's CPU-bound. If it's I/O bound (to harddrive, for example), there is not much you can do except changing the algorithm.

    Otherwise profile the code, look for the performance bottleneck, and try to rewrite it to make it faster.

    But yeah, nothing much we can do without seeing the code.

  6. #6
    Captain Crash brewbuck's Avatar
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    Quote Originally Posted by Sshakey6791 View Post
    I made some programs at my house and they run find but I trying them out on my schools computer and it runs slow. any tips on how I can make my codes better so that it runs the same for most computer?
    Can you create a gallon of gasoline that goes for 45 miles no matter what kind of car you put it in?
    Code:
    //try
    //{
    	if (a) do { f( b); } while(1);
    	else   do { f(!b); } while(1);
    //}

  7. #7
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    We can't give you specific help without at least SOME understanding of what your code does.

    I wrote up some hints on how to measure/improve performance:
    http://apps.sourceforge.net/mediawik...d_optimization

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  8. #8
    Registered User Sshakey6791's Avatar
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    Here's a program a made in my 11th grade class

    Code:
    #include <iostream>
    #include <time.h>
    #include <math.h>
    #include <stdlib.h>
    #include <stdio.h>
    
    
    using namespace std;
    
    int main () {
    
    
    	srand ( time ( NULL ) );
    
    	short int NumGuess;
    	int InvisableNum = ( rand () % 100 ) + 1;
    	short int num = 0;
    
    
    	system("COLOR 7");
    
    	cout << " \t \t Guessing Game" << endl << endl;
    
    
    	do { 
    
    
    
    		cout << "Guess a number between 1 - 100 (0 to exit): ";
    		cin >> NumGuess;
    
    
    
    		if ( NumGuess > InvisableNum ) {
    
    				cout << endl;
    				cout << "To High! " << endl << endl;
    
    
    		} else if ( NumGuess < InvisableNum ) {
    
    				cout << endl;
    				cout << "To Low! " << endl << endl;
    
    		}
    
    		num++;
    
    
    		if ( NumGuess == InvisableNum ) {
    
    				cout << endl << endl;
    
    				cout << "You are right!!, it took you " << num << " trys" << endl << endl;
    				cout << endl;
    
    		} 
    
    	} while ( NumGuess != InvisableNum ); 
    
    		system("pause");
    
    
    	return(0);
    
    
    }
    Very basic but it's the only one I have on me at school : (
    "Blood you have thirsted for -- now, drink your own!"
    (Dante)

  9. #9
    C++ Witch laserlight's Avatar
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    You are saying that this program runs too slow?
    C + C++ Compiler: MinGW port of GCC
    Version Control System: Bazaar

    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  10. #10
    The larch
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    I guess the only things that might be too slow are the system calls. Don't use external programs for these things or just live with it...
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  11. #11
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    that should run like gangbusters on a 286

  12. #12
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    On a windows platform, it MAY run slow if the graphics card isn't accellerating certan bitblt l operations used for scrolling the screen. Try switching to full-screen mode (ALT-ENTER in a command prompt). Or simply reduce the number of "endl" to reduce the amount of scrolling in the first place.

    But yess, I agreee with m37h0d - it shouldn't run slow on any computer produced in the last 15 years or so.

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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