C + + String programming Training 5

Mobile phone number legality:

1) 13-bit length

2) begin with 86 of the country code

3) Each digit of the mobile phone number is a number

Title: Determine whether the mobile phone number is legitimate, output the corresponding value

Description: function requirements include:

1) legal return 0;

2) The length of the law returns 1;

3) returns 2 if non-numeric characters are included;

4) does not start with 86 and returns 3.

int Legal_phone (const string &str)
{
if (Str.size ()!=13)//Length of judgment
{
return 1;
}
if (str[0]!= ' 8 ' &&str[1]!= ' 6 ')//Whether 86 is the beginning of the judgment
{
return 3;
}
for (int i=0;i<str.size (); i++)//whether there is a non-numeric judgment
{
if (!isdigit (Str[i]))
{
return 2;
}
}
return 0;
}

int main ()
{
String str;
Getline (CIN,STR);
int Res=legal_phone (str);
cout<<res;
}

C + + String programming Training 5