C language help post (email address in the judgment of the @ symbol)-CodePudding

Judgment with c language email address the following four points, appear a quote error
1. The email address of the first is the @ symbol
2. The email address in the last one is the @ symbol
3. Email address does not appear in the @ symbol
4. In the email address above 2 times the @ symbol

CodePudding user response:

 # include & lt; stdio.h> 
#include  

Int check_at_ch SRC (char *); 

Int main () 
{
Char STR []="xx @ XXXX"; 

If (check_at_ch (STR) & lt; 0) 
Printf (" error! \n"); 

Printf (" % d \ n ", check_at_ch (STR)); 

return 0; 
} 

Int check_at_ch (char * SRC) 
{
Char * PSTR; 
Unsigned int pos. 

PSTR=STRCHR (SRC, '@'); 
if (! PSTR)//no '@' 
The return - 3; 

Pos=PSTR - SRC; 
If (pos==0)//at first 
return -1; 
Else if (pos==strlen (SRC) - 1)//at the end 
The return - 2; 
Else if (STRCHR (PSTR + 1, '@'))//appear more than 2 times 
The return - 4; 
The else 
return 0; 
}

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