Thread: Gradebook Program - Small Problem, Need Assistance

Hi everyone, I am going to post a gradebook program I wrote recently (in C programming, using DevC), but am having some trouble with. I need to have averages in both the Columns and Rows, but can't seem to get the Columns to work, right now it just shows the same as the Rows...If anyone can see my error, which I am sure is there, please let me know, and thanks.

Code:

#include <stdio.h>
#include <stdlib.h>

#define MAX_ROWS 3
#define MAX_COLS 3


void getData      (int   table[][MAX_COLS]); 
void rowAverage   (int   table[][MAX_COLS],
                   float rowAvrg []);
void colAverage   (int   table[][MAX_COLS],
                   float colAvrg []);
void  printTables (int   table[][MAX_COLS], 
                   float rowAvrg[], 
                   float colAvrg[],
                   FILE *fout);

int main (void)
{

    int   table  [MAX_ROWS][MAX_COLS];

   FILE *fout;
   
   fout = fopen ("studentGrades.dat", "w");

    float rowAve [MAX_ROWS] = {0.0};
    float colAve [MAX_COLS] = {0.0};


    getData (table);
    rowAverage (table, rowAve);
    colAverage (table, colAve);

    printf("\n");
    printTables (table, rowAve, colAve, fout);
    printf("Open up \'studentGrades.dat\' to see the grades...\n");
    system ( "PAUSE" );
    return 0;
}
void getData (int table[][MAX_COLS]) 
{
     int row;
     int col;

    
    for (row = 0.0; row < MAX_ROWS; row++)
       for (col = 0.0; col < MAX_COLS; col++)
           {
            printf("\nEnter a grade for student %d and grade %d: ", row+1, col+1);
            scanf("%d", &table[row][col]);
           }
    return;
}

void rowAverage (int    table[][MAX_COLS],
                 float  rowAvrg [])
{
         int row;
         int col;
          
    for (row = 0.0; row < MAX_ROWS; row++)
        {
         for (col = 0.0; col < MAX_COLS; col++)
             rowAvrg[row] += table [row][col];
         rowAvrg [row] /=  MAX_COLS;
        }
    return;
}

void colAverage (int   table[][MAX_COLS],
                   float colAvrg [])
{
    int row;
    int col;
    
    for (col = 0.0; col < MAX_COLS; col++)
    {
        for (row = 0.0; row < MAX_ROWS; row++)
        {
            colAvrg[col] += table [col][row];
        }
        colAvrg [col] /= MAX_ROWS;
    }
    return;                      
}
void printTables (int    table[][MAX_COLS],
                  float  rowAvrg[], 
                  float  colAvrg[],
                  FILE *fout)
{
          int row;
          int col;

    
    for (col = 1; col <= MAX_COLS; col = col + 1)
    {
        fprintf(fout, "  Exm%d"  , col);   
    }
    
        fprintf(fout, "\n"); 
    
    
    for (row = 0.0; row < MAX_ROWS; row++)
       {
        fprintf (fout, "Stu%d ", row+1);
        for (col = 0.0; col < MAX_COLS; col++)
        fprintf (fout,"%4d", table[row][col]);
        fprintf (fout,"   | %4.2f\n", rowAvrg [row]);
       }

fprintf (fout,"-------------------------------------------------\n");
fprintf (fout,"     ");

        for (col = 0.0; col < MAX_COLS; col++)
        fprintf (fout,"%6.2f", colAvrg [col]);
        
    return;
}

Silly me...I needed to change one line to this:

Code:

colAvrg[col] += table [row][col];

Instead of what I had!