Check first two characters in string

[muha]

Hi all, I would like to know how to check if the first two characters in a string are equal to a value.e.g I have a string containing 701285463257.

if(first two characters are 70){int o=2;}
else{o=3;}

Thanks :D

[Moschops]

std::string someString("701285463257");

if ( (someString[0] == '7') &&
      (someString[1] == '0'))
{
  o = 3;
}
else
{
  o = 2;
}

[andywestken]

I would add a guard using 2 <= someString.length(), as operator[] doesn't like being used on empty strings.

[helios]

Alternatively, someString.substr(2)=="70", although it's a little more expensive.

[muha]

Thanks so much guys :D

[andywestken]

Another approach I sometimes use is 0 == someString.find("70")