ciq-remove-trailing-zeros

// get the number of decimals in a numeric value, up to a given precision (max decimals).
// (to make this determination, the value is first rounded to the max number of decimals)
function getNumberOfDecimals(num as Numeric, maxDecimals as Number) as Number {
    var factor = Math.pow(10, maxDecimals);
    num = Math.round(num * factor).toNumber();
    var count = maxDecimals;
    while (count > 0) {
        if (num % 10 != 0) {
            break;
        }
        num = num / 10;
        count--;
    }
    return count;
}

function toStringWithoutTrailingDecimals(num as Numeric, maxDecimals as Number) as String {
    return num.format("%0." + getNumberOfDecimals(num, maxDecimals) + "f");
}

function test() as Void {
    System.println(toStringWithoutTrailingDecimals(100, 2)); // 100
    System.println(toStringWithoutTrailingDecimals(100.5, 2)); // 100.5
    System.println(toStringWithoutTrailingDecimals(100.55, 2)); // 100.55
    System.println(toStringWithoutTrailingDecimals(100, 3)); // 100
    System.println(toStringWithoutTrailingDecimals(100.5, 3)); // 100.5
    System.println(toStringWithoutTrailingDecimals(100.55, 3)); // 100.55
    System.println(toStringWithoutTrailingDecimals(100.555, 3)); // 100.555

    System.println(toStringWithoutTrailingDecimals(100.5559, 3)); // 100.556
    // demonstrates the original value is properly rounded first
    System.println(toStringWithoutTrailingDecimals(100.5999, 3)); // 100.6
}