Error: cannot convert 'std::string (aka std::basic_string}' to 'int' in assignment

Question

I have a problem - I want to store values from standard input line to an int but am unsure how to convert to an int:

string line;
int value;
getline(cin,line);
istringstream ss(line);
while (ss>>line) {
    if (ss.eof()==false) {
        // stores non ints in strings
    }
    else {
        value=line; //ERROR
    }
}

I have tried to convert this using standard documentation material but I am going nowhere. What am I doing wrong?

Simply doing `while(cin >> value)` will generally be what you want. — Chad, Jul 28 '15 at 15:43

score 0 · Answer 1 · answered Jul 28 '15 at 14:24

0

You can use std::stoi:

value=std::stoi(line);

answered Jul 28 '15 at 14:24

yizzlez

8,757
4
29
44

Thanks. I tried that and I'm getting error: 'stoi' is not a member of 'std'. I have included the right libraries eg. std::stoi so is this not a library problem? – theBookeyMan Jul 28 '15 at 14:32
@theBookeyMan Did you include , are you using c++11? – yizzlez Jul 28 '15 at 14:33

score 0 · Answer 2 · answered Jul 28 '15 at 15:40

0

You could use your istringstream to try loading a value into an int while checking for ss.fail().

ss >> temp; // where temp is an int
if(ss.fail())
{
// handle the error because the value wasn't an int
}
else
{
// process your int
}

This, naturally, could be modified a bit based on your needs.

answered Jul 28 '15 at 15:40

Tyler

197
3
13

There may be a cleaner way to do this though... – Tyler Jul 28 '15 at 15:41

Error: cannot convert 'std::string (aka std::basic_string}' to 'int' in assignment

2 Answers2