plus static method
精确加法
Implementation
static num plus(dynamic num1, dynamic num2, [List<dynamic>? others]) {
if (others != null) {
return plus(plus(num1, num2), others[0], others.length >= 2 ? others.sublist(1) : null);
}
num baseNum = pow(10, max(digitLength(num1), digitLength(num2)));
return (times(num1, baseNum) + times(num2, baseNum)) / baseNum;
}