So line is a string and str is a C style string so you can use strtok on it.

Why not just use strcpy(str, line.c_str()) ?

In order to make the matrix implementation as flexible as possible, we will not place an a priori limit on the size of the matrix that can be represented. This will require the use of dynamic memory allocation. Consequently, the private data members for matrix is consist of the variable rows and cols, which will be used to store the row and column dimensions of a matrix, and element, which will be used to store a variable of type pointer-to-pointer-to-double. For a given matrix, the variable element will point to an array of pointers, and each element in this array of pointers will point to another array that contains the elements belonging to a single row of the matrix.

Each "row" and "col" has a name (string data type) and is identified by an identifier (int type) in the matrix. To elaborate further, each row in the matrix represents a "row" and each column index represents a unique name of a "col".

crap.cpp(10) : error C2664: 'std::basic_ifstream<_Elem,_Traits>::basic_ifstream(const char *,std::ios_base::openmode,int)' : cannot convert parameter 1 from 'std::string' to 'const char *'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called crap.cpp(42) : error C2664: 'std::basic_ifstream<_Elem,_Traits>::basic_ifstream(const char *,std::ios_base::openmode,int)' : cannot convert parameter 1 from 'std::string' to 'const char *'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called crap.cpp(95) : error C2664: 'std::basic_ifstream<_Elem,_Traits>::basic_ifstream(const char *,std::ios_base::openmode,int)' : cannot convert parameter 1 from 'std::string' to 'const char *'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called

Originally Posted by AdRock

I have been working on this for a little while and have come up with this which isn't perfect by far

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C++ Syntax (Toggle Plain Text)

#include <fstream>
#include <iostream>
#include <string>
#include <vector>
 
using namespace std;
 
void number_rows(string file)
{
	ifstream myfile(file);
	if (!myfile)
	{
		cout << "I could not open the file.\n";
		//return EXIT_FAILURE;
    }
	else 
    {
		string line;
 
		vector<string> rows;
 
		while (getline( myfile, line ))
		{
			string str1 = "<row>";
			string str2 = "</row>";
			int pos = line.find(str1, 0);
			if(pos !=string:: npos)
				continue;
			else
			pos = line.find(str2, 0);
			if(pos != string::npos)
				break;
			else
				rows.push_back(line);	
		}
	}
    myfile.close();
}
 
void number_cols(string file)
{
	ifstream myfile(file);
	if (!myfile)
	{
		cout << "I could not open the file.\n";
		//return EXIT_FAILURE;
    }
	else 
    {
		string line;
 
		vector<string> cols;
 
		while (getline( myfile, line ))
		{
			string str1 = "<col>";
			string str2 = "</col>";
			int pos = line.find(str1, 0);
			if(pos !=string:: npos)
				continue;
			else
			pos = line.find(str2, 0);
			if(pos != string::npos)
				break;
			else
				cols.push_back(line);	
		}
	}
    myfile.close();
}
 
void get_matrix(string file)
{
	/*ifstream data(file, ios::in);
    string line, temp;
    istringstream oss;
    int count = 0;
    vector< vector<string> > DataFromFile;
 
    while(getline(data, line)){
        DataFromFile.push_back( vector<string>() );
        oss.clear();
        oss.str(line);
        while(oss >> temp)
            DataFromFile[count].push_back(temp);
        count++;
    }*/
}
 
int main()
{
 
	string file = "words.txt";
 
	ifstream myfile(file);
	if (!myfile)
	{
		cout << "I could not open the file. Fooey.\n";
		return EXIT_FAILURE;
	}
	else 
	{
		number_rows(file);
		number_cols(file);
		//matrix(myfile);
	}
	return EXIT_SUCCESS;
}

#include <fstream> #include <iostream> #include <string> #include <vector> using namespace std; void number_rows(string file) { ifstream myfile(file); if (!myfile) { cout << "I could not open the file.\n"; //return EXIT_FAILURE; } else { string line; vector<string> rows; while (getline( myfile, line )) { string str1 = "<row>"; string str2 = "</row>"; int pos = line.find(str1, 0); if(pos !=string:: npos) continue; else pos = line.find(str2, 0); if(pos != string::npos) break; else rows.push_back(line); } } myfile.close(); } void number_cols(string file) { ifstream myfile(file); if (!myfile) { cout << "I could not open the file.\n"; //return EXIT_FAILURE; } else { string line; vector<string> cols; while (getline( myfile, line )) { string str1 = "<col>"; string str2 = "</col>"; int pos = line.find(str1, 0); if(pos !=string:: npos) continue; else pos = line.find(str2, 0); if(pos != string::npos) break; else cols.push_back(line); } } myfile.close(); } void get_matrix(string file) { /*ifstream data(file, ios::in); string line, temp; istringstream oss; int count = 0; vector< vector<string> > DataFromFile; while(getline(data, line)){ DataFromFile.push_back( vector<string>() ); oss.clear(); oss.str(line); while(oss >> temp) DataFromFile[count].push_back(temp); count++; }*/ } int main() { string file = "words.txt"; ifstream myfile(file); if (!myfile) { cout << "I could not open the file. Fooey.\n"; return EXIT_FAILURE; } else { number_rows(file); number_cols(file); //matrix(myfile); } return EXIT_SUCCESS; }

what the plan is, is to have seperate functions that adds anything between the <row></row> and <col></col> tags.

I just want to declare a filename once and pass that as a parameter but i get these errors


am i on the right track?

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c++ Syntax (Toggle Plain Text)

ifstream myfile(file);

ifstream myfile(file);