检测是否符合Email格式

最新推荐文章于 2020-07-02 12:52:26 发布

原创最新推荐文章于 2020-07-02 12:52:26 发布 · 1.2k 阅读

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本文介绍了一个简单的C++程序，用于检查用户输入的电子邮件地址是否符合基本的格式要求。程序通过查找‘@’和‘.’字符来判断邮件地址的有效性，并针对几种常见的错误情况给出提示。

#include<iostream>

using namespace std;

int main()
{
char sEmail[10];
char *pAt = NULL;
char *pDot = NULL;
int iAtFlg = 0;
int iDotFlg = 0;
int iLineNum = 1;

cout << "Line Num : " << iLineNum;
iLineNum ++;
while(cin >> sEmail)
{
  iAtFlg = 0;
  iDotFlg = 0;
  if (sEmail[0] == '@')
  {
   cout << "Error 1: First char is @" << endl;
   cout << endl << "Line Num : " << iLineNum << " ";
   iLineNum ++;
  }
  else
  {
   pAt = strchr(sEmail, '@');
   if (NULL == pAt)
   {
    cout << "Error 2: No @" << endl;
    cout << endl << "Line Num : " << iLineNum << " ";
    iLineNum ++;
   }
   else
   {
    pDot = strchr(sEmail, '.');
    if (NULL == pDot)
    {
     cout << "Error 3: No ." << endl;
     cout << endl << "Line Num : " << iLineNum << " ";
     iLineNum ++;
    }
    else
    {
     if(pDot - pAt <= 1)
     {
      cout << "Error 4: @ next is ." << endl;
      cout << endl << "Line Num : " << iLineNum << " ";
      iLineNum ++;
     }
     else
     {
      if ('\0' == *(pDot + 1))
      {
       cout << "Error 5: Last char is ." << endl;
       cout << endl << "Line Num : " << iLineNum << " ";
       iLineNum ++;
      }
      else
      {
       cout << "Email " << sEmail << "is an legitimate" << endl;
      }

     }
    }