#include<stdio.h>
#include<string.h>
int validate_email(char e_mail[25])
{
int i=0,m=0,j=0;
int atc=0,ptc=0,alphabet=0;
if(strcmp(e_mail,"0") == 0)
{
return 1;
}
if( strlen(e_mail) > 25)
{
printf("e_mail length is too long!\n");
return 0;
}
while('\0' != e_mail[i])
{
if( j!=0) m++;
if((e_mail[i] >= 48 && e_mail[i] <= 57) || (e_mail[i] >= 65 && e_mail[i] <= 90) || (e_mail[i] >= 97 && e_mail[i] <= 122))
{
alphabet++;
}
else if(e_mail[i] == '@')
{
if(atc == 1)
{
printf("Have two character '@'!\n");
return 0;
}
atc++;
if(alphabet == 0)
{
printf("The first character is '@'!\n");
return 0;
}
}else if(e_mail[i] == '.')
{
j++;
if(atc == 0)
{
printf("Character '.' before character '@'!\n");
return 0;
}
if(atc == 1)
{
ptc++;
}
if(ptc == 3)
{
printf("Have three charcter '.'!\n");
return 0;
}
}
else
{
printf("Illegal character!!\n");
return 0;
}
if(ptc == 1 && m!=0)
{
if(e_mail[i-1] == '@')
{
printf("The expression is illegal!\n");
return 0;
}
} else if(ptc == 2) { if(e_mail[i-1] == '.') { printf("Twos are character '.' continuous\n"); return 0; } if(e_mail[i] < 65 || (e_mail[i] > 90 && e_mail[i] < 97) || e_mail[i] >122) { printf("Illegal alphabet after character '.' two\n"); return 0; } }
i++; }
if(atc == 0) { printf("No character '@'!\n"); return 0;
}
好的加分0.0