[solved] Roundup value to nearest 200

[Hareen Laks]

Hi,
I need to roundup a value which is always a positive integer. I have to round up it to the nearest 200.
Rules are;

1. Value should be rounded-up to nearest 200. (if 350 I need 400 and if 250 I need 200)
2. Minimum value should be 200. (even 1 should give me 200)

Can anybody help me?

Thanks in advance.

[raven-worx]

use the modulo operator "%".
if the value returned by modulo is smaller than 100 (half of 200) subtract the mod-value from the current value, otherwise add (200-moduloValue) to your current value.

You just need a special case handling for 2)

[Hareen Laks]

raven-worx,

Thanks for replying.

I created below method. Can you check is it the best way for do that?

@void setLength(int l)
{
int minimum_length = 200;

if(l<minimum_length)
{
    l=minimum_length;
}
else
{
    int mod_200 =l % 200 ;

    if(mod_200!=0)
    {
        l = (l/200 + qRound(mod_200/100))*200;
    }
}

d->length = l;

}@

Thanks again.

[raven-worx]

have you tested your method?!

Your method doesn't behave like you described it should be.
Neither did you implement what i suggested.

Here is the working method:
@
int roundValue(int l)
{
const int mod = 200;

if(l < mod)
{
    l = mod;
}
else
{
    int modVal = l % mod;

    if( modVal < (mod/2.0) )
        l -= modVal;
    else
        l += (mod-modVal);
}

return l;

}
@

[Hareen Laks]

yes I tested it and it is working for me. :)

give minimum 200 and round value to nearest 200.