Counting the # of items in an array

This is a discussion on Counting the # of items in an array within the C++ Programming forums, part of the General Programming Boards category; I have this prog and what I need to do is have the user input their numbers and print the ...

  1. #1
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    Counting the # of items in an array

    I have this prog and what I need to do is have the user input their numbers and print the array, Then, for it to count the number of times the number was inputted and print a histogram of the number of times it was used. EX:

    2.......10........3.5
    4.......3.5 ..........21
    3.........8...........7
    //etc....

    response ........# of times....... Histogram
    1 .................... 2 ..................**
    2 ................... 1 .......................*
    //etc....

    Here is what I have and I am unsure of the last few lines. I copied the last couple of lines from another example, I just included it because I know it will look somewhat to those lines. Please help, any help appreciated!

    Code:
    #include <iostream>
    #include <iomanip>
    using namespace std;
    
    const int numrow = 5;
    const int numcol = 3;
    
    int main ()
    {
    double nums[numrow][numcol];
    	
    	for (int i = 0; i <numrow; i++)
    {
    	for (int j = 0; j < numcol; j++)
    {
    	cout << "enter grades for row # " << (i + 1)<< ": ";
    	cin >> nums [i][j];
    }
    }
    	for (int a = 0; a < numrow; a++)
    {
                    for (int b = 0; b < numcol; b++)
    {
                   cout << setw (4) << nums [a][b];
    }
                   cout << "Response" << setw( 13 ) << "Frequency"
                    << setw( 17 ) << "Histogram" << endl;
    
       for ( int i; i < numrow; i++ ) 
    {
          cout << setw( 7 ) << i << setw( 13 ) 
               << n[ i ] << setw( 9 );
    
          for ( int j = 0; j < n[ i ]; j++ )   // print one bar
          cout << '*';
       
       cout << endl;
    }
       return 0;
    }
    Last edited by stevedawg85; 03-23-2006 at 07:20 PM.

  2. #2
    C++ Witch laserlight's Avatar
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    Here is what I have and I am unsure of the last few lines. I copied the last couple of lines from another example, I just included it because I know it will look somewhat to those lines.
    What do you think those 'last few lines' are supposed to do?
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
    and the hat of int overfl Salem's Avatar
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    > Please help, any help appreciated!
    But always ignored
    How to create a multi-dimensional user array?
    Storing and printing matrices
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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