{
   "question_id": 7436880,
   "question_title": "计算出因子里面4和7的个数",
   "question_content": "<p>输入一个正数n&#xff0c;计算出因子里面分别有几个4和7&#xff0c;输出因子中4和7的个位数</p>",
   "difficulty": "简单",
   "answer_id": 53409217,
   "answer_content": "<pre>\n<code class=\"language-python\">n &#61; int(input(&#34;输入数字&#xff1a;&#34;))\nfactor &#61; [n]   # 包括n&#xff1f;\nnum &#61; 1\nwhile num &lt;&#61; n/2&#43;1:\n    if n % num &#61;&#61; 0:\n        factor.append(num)\n    num &#61; num &#43; 1\nprint(factor)\nm &#61; [str(i) for i in factor]\ncount4 &#61; 0\ncount7 &#61; 0\nfor i in m:\n    if &#39;4&#39; in i:\n        count4 &#43;&#61; 1\n        print(&#39;以4结尾的因子的个位数&#xff1a;&#39;, int(i)%10)\n    if &#39;7&#39; in i:\n        count7 &#43;&#61; 1\n        print(&#39;以7结尾的因子的个位数&#xff1a;&#39;, int(i)%10)\nprint(&#39;因子里面分别有{0}个4和{1}个7&#39;.format(count4,count7))</code></pre>\n\n<p>这里的因子包括了数字本身&#xff0c;如果不想包括可以将factor 初始化为[]</p>\n\n<p>输入&#xff1a;140</p>\n\n<p>输出&#xff1a;</p>\n\n<pre>\n[140, 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70]\n以4结尾的因子的个位数&#xff1a; 0\n以4结尾的因子的个位数&#xff1a; 4\n以7结尾的因子的个位数&#xff1a; 7\n以4结尾的因子的个位数&#xff1a; 4\n以7结尾的因子的个位数&#xff1a; 0\n因子里面分别有3个4和2个7</pre>\n\n<p> </p>\n",
   "tag_name": "python",
   "python": "n = int(input(\"输入数字：\"))\nfactor = [n]   \nnum = 1\nwhile num <= n/2+1:\n\tif n % num == 0:\n\t\tfactor.append(num)\n\tnum = num + 1\nprint(factor)\nm = [str(i) for i in factor]\ncount4 = 0\ncount7 = 0\nfor i in m:\n\tif '4' in i:\n\t\tcount4 += 1\n\t\tprint('以4结尾的因子的个位数：', int(i)%10)\n\tif '7' in i:\n\t\tcount7 += 1\n\t\tprint('以7结尾的因子的个位数：', int(i)%10)\nprint('因子里面分别有{0}个4和{1}个7'.format(count4,count7))",
   "topic_link": "https://bbs.csdn.net/topics/600470505",
   "status": 1,
   "keywords": "算法高阶,数论算法,算法问题选编,整数的因子分解",
   "license": "csdn.net",
   "notebook": {
      "python": "https://codechina.csdn.net/csdn/csdn-daily-code/-/jupyter/master/data/notebook/answer/ipynb/python/36.ipynb?type=file"
   },
   "notebook_enable": 1
}