Question

error C2065: ‘exam1’ : undeclared identifier

// basic file operations
#include <iostream>
#include <fstream>
using namespace std;
void read_file_in_array(int exam[100][3]);
double calculate_total(int exam1[], int exam2[], int exam3[]); // function that calcualates grades to see how many 90,80,70,60
//void display_totals();

int main()
{
    int go,go2,go3;
    go=read_file_in_array(exam);
    go2=calculate_total(exam1,exam2,exam3);
    //go3=display_totals();
    cout << go,go2,go3;
    return 0;
}/*
int display_totals()
{

    int grade_total;
    grade_total=calculate_total(exam1,exam2,exam3);
    return 0;
}   */
double calculate_total(int exam1[],int exam2[],int exam3[])
{
    int calc_tot,above90=0, above80=0, above70=0, above60=0,i,j;
    calc_tot=read_file_in_array(exam);
    for(i=0;i<100;i++)
        {
            exam1[i]=exam[100][0];
            exam2[i]=exam[100][1];
            exam3[i]=exam[100][2];
            if(exam1[i] <=90 && exam1[i] >=100)
                {
                    above90++;
                    cout << above90;
                }
        }
        return exam3[i];

}

void read_file_in_array(double exam[100][3])
{
  ifstream infile;  

  int num, i=0,j=0;
  infile.open("grades.txt");// file containing numbers in 3 columns
    if(infile.fail()) // checks to see if file opended
    {
        cout << "error" << endl;
    }
  while(!infile.eof()) // reads file to end of line
      {
          for(i=0;i<100;i++) // array numbers less than 100
          {
            for(j=0;j<3;j++) // while reading get 1st array or element
            infile >> exam[i][j];
            infile >> exam[i][j];
            infile >> exam[i][j];
            cout << exam[i][j] << endl;
          }
          exam[i][j]=exam1[i];
          exam[i][j]=exam2[i];
          exam[i][j]=exam3[i];

      }
  infile.close();

}

Answer 1

go=read_file_in_array(exam);

exam is not declared in the scope of main 😕 How about declaring it (perhaps int exam[100][3])