一、题目

二、拆分数字

#include <iostream>

using namespace std;

void breakNumber(int num)
{
	while (num > 10) {
		int digit = num % 10;
		num = num / 10;
		cout << digit << endl;
	}
	cout << num << endl;
}

int main()
{
	breakNumber(123456789);
	return 0;
}

输出：

9
8
7
6
5
4
3
2
1

三、代码

#include <iostream>

using namespace std;

//记录四个人各跳了几次
//skip[0] - 丁
//skip[1] - 甲
//skip[2] - 乙
//skip[3] - 丙
int skip[4] = { 0,0,0,0 };

int n;

int cnt = 0;

bool containSeven(int num)
{
	while (num > 10) {
		int digit = num % 10;
		num = num / 10;
		if (digit == 7)
			return true;
	}
	if (num == 7)
		return true;
	else
		return false;
}

int main()
{
	cin >> n;
	for (int num = 1; ; num++) {
		if (num % 7 == 0 || containSeven(num))
			skip[num % 4]++;
		else
			cnt++;
		if (cnt == n)
			break;
	}
	cout << skip[1] << endl;
	cout << skip[2] << endl;
	cout << skip[3] << endl;
	cout << skip[0] << endl;
	return 0;
}