split s string at the first whitespace

[tyky9808]

Can anyone help? My program is due on Monday. I'm trying to split strings I'm reading from a file. The split function will divide the original string into two parts, putting the second part of the string into the empty parameter and leaving the first part of the string (without the space and the rest of the string) in the original variable. For example: "you have" the original string will be changed to "you" and the second string will get the value "have". Then main will call the function and print out both strings. This is my code, I'm lost with this.

//Function to split the original string at the first whitespace
void split(string &first, string &second)
{

string::size_type pos;
pos=first.find(' ',0);
second=first.substr(pos,0);

return;
}

[Corpus]

Hi

You are very close. you will make it.

Take a piece of paper, write "you have" and mark the position ("pos" in your code) of the ' '-character. Then, from that mark, think of what needs to go into the first string and what needs to go into the second string. Then, using substr(), put them there.

[tyky9808]

Is this correct?

string::size_type pos;
pos=first.find(' ',0);
second=first.substr(pos+1);
first=first.substr(0,pos);

[firedraco]

That would almost work, but if there is no space in your string? .find() would return string::npos, and adding 1 to that would generate an error.

[Corpus]

tyky: Yes, It would, assuming that there is a whitespace in the string. As firedraco mentions, you will probably need to check this explicitly by checking the returned value from the find()-call. But otherwise, you're good.

[tyky9808]

thank you for your help. My professor wanted us to include a whitespace in each string.