Undefined Reference Problem

This is a discussion on Undefined Reference Problem within the C++ Programming forums, part of the General Programming Boards category; I can't seem to find out the problem here. If anyone could help me, that would be great. Compiler output: ...

  1. #1
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    Question Undefined Reference Problem

    I can't seem to find out the problem here. If anyone could help me, that would be great.

    Compiler output:
    c:\windows\TEMP\ccTo2Afb.o(.text+0x6b):histog~1.cp p: undefined reference to `average_numbers(int *, int)'
    c:\windows\TEMP\ccTo2Afb.o(.text+0xd0):histog~1.cp p: undefined reference to `make_frequency(int *, int, int *, int)'
    c:\windows\TEMP\ccTo2Afb.o(.text+0xe4):histog~1.cp p: undefined reference to `make_histogram(int *, int)'

    Program:

    #include <iostream.h>
    #include <stdlib.h>
    #include <iomanip.h>
    #include <fstream.h>

    const int MAX_ELMNTS = 100;
    const int ANLYS_RNG = 19;

    // ===========Open input file===========
    // Gets the name of the input file and opens it for input

    void open_input_file ( ifstream &in_file );
    // =============Get Data============
    // Read data from the file into the array. The array may not be completely
    // filled. It will use what is there and discard any extra data.

    int get_data
    ( int numbers[], int size, int range );

    // ============Print Data=============
    // Print the data as a 2-dimensional array.

    void print_data
    ( const int numbers[], int size, int line_size );

    // ============Average Numbers===========
    // Reckons the average of the numbers in the array.

    float average_numbers
    ( int numbers[], int size);

    // ===========Make Frequency==========
    // Puts the frequency count into an array.

    void make_frequency
    ( int numbers[], int size, int frequency[], int range );

    // ==============Make histogram========
    // Prints the histogram based on the frequency counts.

    void make_histogram
    ( int frequency[], int range );

    // ===============main==============
    int main()
    {
    // Local Declarations
    int size;
    int nums[MAX_ELMNTS];
    int frequency[ANLYS_RNG + 1];

    // Statements
    size = get_data( nums, MAX_ELMNTS, ANLYS_RNG );

    cout << "The average of the numbers is "
    << average_numbers( nums, size )
    << endl;

    print_data( nums, size, 10 );

    make_frequency( nums, size, frequency, ANLYS_RNG );
    make_histogram( frequency, ANLYS_RNG );

    system("PAUSE");
    return 0;
    }

    // ==========Open Input File===============
    void open_input_file
    ( ifstream &in_file )
    { char in_file_name[80];

    cout << "Enter the input file name: ";
    cin >> in_file_name;

    in_file.open(in_file_name);
    if (!in_file)
    cerr << "Error opening file\a\a\n", exit(100);
    }
    // ===========Average Numbers=============
    float average_numbers
    ( const int numbers[], int size )
    { float sum = 0.0;
    int i;

    for (i = 0; i < size; i++ )
    sum = float( numbers[i] ) + sum;
    if (size != 0)
    { return (sum/float(size)); }
    else
    { cout << "No values entered \n";
    exit (101);
    }
    }
    // =============Get Data===============
    int get_data
    ( int numbers[], int size, int range )
    {
    int data_in;
    int loader = 0;
    ifstream fs_data;

    open_input_file (fs_data);

    while (loader < size && (fs_data >> data_in))
    {
    if (data_in >= 0 && data_in <= range)
    numbers[loader++] = data_in;
    else
    cout << "Data point " << data_in
    << " invalid. Ignored. \n";
    }

    if (loader == size && (fs_data >> data_in))
    cout << "\nToo much data. Will process what was read. \n";
    return loader;
    }
    //==============Print Data===============
    void print_data
    ( const int numbers[], int size, int line_size )
    {
    int i;
    int num_printed = 0;

    cout << endl << endl;

    for (i = 0; i < size; i++)
    {
    num_printed++;
    cout << setw(4) << numbers[i];
    if (num_printed >= line_size)
    {
    cout << endl;
    num_printed = 0;
    }
    }
    cout << endl << endl;
    return;
    }
    //==============Make Frequency==========
    void make_frequency
    ( const int numbers[], int size, int frequency[], int range )
    {
    int i;

    for (i = 0; i <= range; i++)
    frequency[i] = 0;
    for (i = 0; i <= size; i++)
    frequency[numbers[i]] = frequency[numbers[i]] + 1;

    return;
    }
    //=============Make Histogram============
    void make_histogram
    ( const int frequency[], int range )
    {
    int i;
    int j;

    for (i = 0; i <= range; i++)
    {
    cout << setw(3) << i << setw(3) << frequency[i];
    for (j = 1; j <= frequency[i]; j++)
    cout << "*";
    cout << endl;
    }
    return;
    }
    Last edited by esilja; 11-08-2001 at 12:05 AM.

  2. #2
    zen
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    It's because the parameter types in your declarations don't match the parameter types in your definitions, so the compiler is looking for the definitions but can't find them.

    'const int numbers[]' is not the same as 'int numbers[]'.
    zen

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