CODEWITHSUNDEEP
c++
Xenon8891
Xenon8891

Reputation: 21

Reading file into vector through function

I am trying to read the txt file into the vector in function readIn. I cannot for the life of me get it to work. Either I get the following message "error: expected primary-expression before '&' token readIn(ifstream& infile, vec);" or the function isn't called at all.

int main() {

const int MAXSIZE = 100;
vector<int> vec (MAXSIZE);

ifstream infile;
infile.open("in9.3.txt");

readIn(ifstream& infile, vec);

return(0);
}

void readIn(ifstream& infile, vector<int> &vec) {
int a, count;

count = 0;
while (!infile.eof()) {
    infile >> a;
    vec.at(count) = a;
    count++;
}
infile.close();
vec.resize(count);
}

Upvotes: 1

Views: 56

Answers (1)

paddy
paddy

Reputation: 63471

You must not specify the type of the parameter when passing to a function. What you have written is incorrect:

readIn(ifstream& infile, vec);  // error

Note that you are trying to pass the variable infile which is defined in main. The compiler is complaining about the fact that you prefixed this with ifstream&. The correct call is:

readIn(infile, vec);

Also beware that since the function is defined after main, there must be a function declaration somewhere before main. It is not clear whether you did this or not, since you have not shown a complete program. In any case, you can either move the whole definition before main, or just add this line:

void readIn(ifstream&, vector<int>&);

Upvotes: 3

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