Round a decimal number to the first decimal position that is not zero

Question

I want to shorten a number to the first significant digit that is not 0. The digits behind should be rounded.

Examples:

0.001 -> 0.001
0.00367 -&g         


        

Answer 1

var value = 0.000000564;

int cnt = 0;
bool hitNum = false;
var tempVal = value;
while (!hitNum)
{
    if(tempVal > 1)
    {
        hitNum = true;
    }
    else
    {
        tempVal *= 10;
        cnt++;
    }
}

var newValue = (decimal)Math.Round(value, cnt);