Comparing: Switch() and If() - Printable Version

Comparing: Switch() and If() - Printable Version

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+---- Thread: Comparing: Switch() and If() (/showthread.php?tid=160357)

Comparing: Switch() and If() - DeathOnaStick - 16.07.2010

Hey everyone. Just wanted to know if there is a difference (according to the speed) between:

pawn Код:

if(x==0)print("x=0");

and

pawn Код:

switch(x){case 0:print("x=0");}

I know, the differences will be real small, but i wonder which is actually the faster version.

Thanks!

Re: Comparing: Switch() and If() - Sergei - 16.07.2010

For only one case, I think there's not any difference really. However, for mroe cases switch is definitelly better and easier to use.

Код:

if(x== 0 || x== 1 || x==2)

Код:

switch(x)
{
    case 0,1,2:
}

You can make speed test yourself if you want.

Re: Comparing: Switch() and If() - WackoX - 16.07.2010

''If'' Is for short things like:

Код:

if(PlayerInfo[playerid][pAdmin] >= 1 && PlayerInfo[playerid][pAdmin] != 8)

''Switch'' Is for long things like:

Код:

switch(PlayerInfo[playerid][pAdmin])
{
    case 0:
    case 1:
    case 2:
    case 3:   
    case 4:    
    case 5:
    case 6:
    case 7:
    case 8:
}

Re: Comparing: Switch() and If() - DeathOnaStick - 16.07.2010

I made some sort of speed test and in this case the if-statement is about 75% faster than the switchfunction.

The if-statement takes about 125ms for 1000 simple operations.
The switchfunction takes 229ms for the same amount of the same operations.

I dont know if 1000 is a good value but i let it run about 10 times now and the results did not change more than 25ms.

Cheers.

#edit#
If you care: here my code:

pawn Код:

main()
{
    new TC1, TC2, TC3, TC4, x=0;
    TC1=GetTickCount();
    for(new i=0; i<=1000; i++)switch(x){case 0:print("x=0");}
    TC2=GetTickCount();
    TC3=GetTickCount();
    for(new i=0; i<=1000; i++)if(x==0)print("x=0");
    TC4=GetTickCount();
    printf("%d = switchfunction", (TC2-TC1));
    printf("%d = if-statement", (TC4-TC3));
}

Re: Comparing: Switch() and If() - Finn - 16.07.2010

How come for me it looks like switch is faster when it's about multiple statements and for single statement they're both the same speed?

pawn Код:

new x = 1;
    
    new check1 = GetTickCount();
    
    for(new i; i < 1000; i++)
    {
        if(x == 0) x = 1;
        else if(x == 1) print("abc");
        else if(x == 2) x = 1;
        else if(x == 3) x = 1;
        else if(x == 4) x = 1;
    }
    
    new check2 = GetTickCount();
    
    for(new i; i < 1000; i++)
    {
        switch(x)
        {
            case 0: x = 1;
            case 1: print("abc");
            case 2: x = 1;
            case 3: x = 1;
            case 4: x = 1;
        }
    }
    
    new check3 = GetTickCount();
    
    for(new i; i < 1000; i++)
    {
        if(x == 1) print("abc");
    }
    
    new check4 = GetTickCount();
    
    for(new i; i < 1000; i++)
    {
        switch(x)
        {
            case 1: print("abc");
        }
    }
    
    new check5 = GetTickCount();
    
    printf("1: %d, 2: %d, 3: %d, 4: %d", check2-check1, check3-check2, check4-check3, check5-check4);

Here's my results with the code above:

Код:

[21:05:52] 1: 227, 2: 103, 3: 102, 4: 101

_______________

I use them both. There's no difference really, only in the indentation.

Re: Comparing: Switch() and If() - DeathOnaStick - 16.07.2010

I think you're right but my calculation is a bit weird then, because i tried this code very often and i actually dont see a mistake in it?! Anyway, thanks, my question is answered =).