From 1 to each number in parameter n, the number of occurrences of 1 on each bit and

/** * For each number from 1 to parameter n, 1 occurrences and *  * @param n * @return */public static int countone (int n) {int factor = 1;int Cur;int lo W;int High;int cnt = 0;while ((n/factor)! = 0) {low = n-(n/factor) * factor;//lower digit cur = (n/factor)% 10;//current bit digit h IgH = N/(factor * 10);//high-level digital switch (cur) {case 0:cnt + = high * factor;//up to higher level break;case 1:cnt + = higher * factor + low + 1;break;default:cnt + = (high + 1) * factor;} Factor *= 10;} return CNT;}

From 1 to each number in parameter n, the number of occurrences of 1 on each bit and