Reading text to arrays

[Newbiee]

I'm very new to C++ so I don't know much. I have a text file that list students' first names, last names, and three grades. I want to read the values from the file into three separate arrays. The file is formatted as follows:

Bob Smith 40 42 50
Humpty Dumpty 61 66 65
Pam Bam 99 97 96
Letty Lum 99 98 99

I want to create a first array that contains the first names of the students. Then I want to create a second array that contains the last names of the students. Finally I want a third array that contains the scores of each student. I do not want to use a multidimensional array. I cannot use separators or vectors.

How can I read those specific parts of the file to their own arrays? This IS a part of a homework assignment, so I only need a hints.

[giblit]

What I would do is put a separator in between each group instead of spaces ex:
Bob|Smith|40 42 50
You would write this code like this (I'm going to use vectors but you use them basically the same as arrays.)

std::string temp( "" );
std::vector<std::string> first , last , grades;
std::ifstream in( "data.txt" );
while( in.good() )
{
    getline( in , temp , '|' );
    first.push_back( temp );
    getline( in , temp , '|' );
    last.push_back( temp );
    getline( in , temp , '|' );
    grades.push_back( temp );
}

You said you didn't want 2d but I honestly would do something like this

std::string temp( "" );
std::vector<std::vector<std::string> > data( 3 , std::vector<std::string> );
std::ifstream in( "data.txt" );
while( in.good() )
{
    for( int i( 0 ); i < 3; ++i )
    {
        getline( in , temp , '|' );
        data[ i ].push_back( temp );
    }
}

That would read in numbers as strings though if you are trying to modify the number you would want to do something like this

std::string temp_str( "" );
int temp_int( 0 );
std::vector<std::string> first , last;
std::vector<int> grades;
std::ifstream in( "data.txt" );
while( in.good() )
{
    getline( in , temp_str , '|' );
    first.push_back( temp_str );
    getline( in , temp_str , '|' );
    last.push_back( temp_str );
    for( int i( 0 ); i < 3; ++i )
    {
        in >> temp_int;
        grades.push_back( temp_int );
    }
}

What I would do in this situation though is more like this (without a separator also)

std::string temp_str( "" );
int temp_int( 0 );
std::vector<std::vector<std::string> > names( 2 , std::vector<std::string> );
std::vector<std::vector<int> > grades( 3 , std::vector<int> );
std::ifstream in( "data.txt" );

while( in.good() )
{
    for( int i( 0 ); i < 2; ++i )
    {
         in >> temp_str;
         names[ i ].push_back( temp_str );
    }
    for( int i( 0 ); i < 3; ++i )
    {
         in >> temp_int;
         grades[ i ].push_back( temp_int );
    }
}

There are probably better ways to write the code though.

[Newbiee]

Thanks for the ideas! The only problem is I can't use separators or vectors for the assignment. Most suggestions I've seen for this problem involve one of the two.. so I really have no idea where to start.

[JLBorges]

Something like this:

#include <iostream>
#include <string>
#include <fstream>

int main()
{
    constexpr int MAX_STUDENTS = 1024 ; // max possible
    int num_students = 0 ; // actual number

    std::string first_names[MAX_STUDENTS] ;
    std::string last_names[MAX_STUDENTS] ;
    int first_exam_scores[MAX_STUDENTS] = {0} ;
    int second_exam_scores[MAX_STUDENTS] = {0} ;
    int third_exam_scores[MAX_STUDENTS] = {0} ;

    std::ifstream file( "file_name.txt" ) ;
    std::string first_name ;
    std::string last_name ;
    int one, two, three ; // scores

    while( file >> first_name >> last_name >> one >> two >> three ) // for each student
    {
        // store the values
        first_names[num_students] = first_name ;
        last_names[num_students] = last_name ;
        first_exam_scores[num_students] = one ;
        second_exam_scores[num_students] = two ;
        third_exam_scores[num_students] = three ;

        ++num_students ; // increment number of students
    }

    // ....
}

[Newbiee]

I forgot to say earlier that this was exactly what I needed! I'm always surprised by how fast the responses are here when people ask for help. Thanks! :)