如何计算百分比[关闭]

Question

I am really bad at math and i can't calculate the following thing.. I have two columns named experience and level .

If experience is over 200 then level is updating to 1

If experience is over 500 then level is updating to 2

.... I mean I never reset experience.

So, I have a loading bar image and i have to calculate how long to be in percentages. I tried something like this

function lvlbar($xp, $level){

if($level == 0)
    {

         $percent = @round(($xp / 200)*100);

   }

    elseif($level == 1){

$percent = @round(($xp / 500)*100);

    }

    elseif($level == 2){

    $percent = @round(($xp / 900)*100);
} 

    elseif($level == 3){
    $percent = @round(($xp / 1400)*100);
} 

    elseif($level == 4){
    $percent = @round(($xp / 1900)*100);
} 

    elseif($level == 5){
    $percent = @round(($xp / 2500)*100);
} 

    elseif($level == 6){
    $percent = @round(($xp / 3200)*100);
} 

    elseif($level == 7){
    $percent = @round(($xp / 4000)*100);
} 

    elseif($level == 8){
    $percent = @round(($xp / 4900)*100);
} 

    elseif($level == 9){
    $percent = @round(($xp / 5800)*100);
} 

    elseif($level == 10){
    $percent = @round(($xp / 6800)*100);
}

return $percent;

}

It's working fine when you are under level 1 but once you hit level 2 calculations goes wrong and percentages starts at 50, 60 and so.. I guess it's my formula.Help me out

Answer 1

Your concept looks good, but there is a slight mistake. The experience bar needs to reset for each level. For example, when experience is 350, you want to show 50%.

It means, your formula is:

Percent to next level = Experience from current level / Experience required to advance to next level

Again, example:

Percent to level 2 when experience is 350 = (350 - 200) / (500 - 200) = 50%