c#如何将一串数字按4个一组截取出来

Question

比如随便输入：765489431256

截得：7654 8943 1256这三组数

Answer 1

long num = 765489431256L;
long step = (long) System.Math.Pow(10, 4);
for (; num > 0; num = num / step)
{
    Console.WriteLine(num % step);
}