Hey guys,
I'm trying to write something to a .txt file from within my program using ofstream.
I have this function names show_results() which is a bunch of cout statements that are connected to a class and a bunch of member functions.
But the function show_results is all cout statements. How do I write the all the the function (what you would see when running the program) to a .txt file.
Thanks
Jump to PostFirst, declare
ofstream report;within main() so it's not global. Then, for your function output_info, pass report in by reference (so you'll have to change your declaration of output_info to report this). Make sure you do the opening of your file within main() first before you pass it into anything.
…
You should just be able to substitute your ofstream object for the cout directly. See http://www.bgsu.edu/departments/compsci/docs/write.html
Hey if anyone can help. Im trying to put the contents (cout statements) of the function show_scores to an external file named student.txt the function show_results is connected to a bunch of class member variables and functions.
i tried something like
out_stream>> show_scores();#include <iostream>
#include <cstdlib>
#include <fstream>
using std::ofstream;
using namespace std;
double class_total;
class student
{
public:
void get_info(); // Acquires input for student id, name
void get_scores(); // Acquires input for student quiz and test scores
void output_info(); // Displays student info and scores and grade summary
void calc_total(); // calculates class total points
void calc_grade(); // calculates student total points and grade
double calc_max(double the_max, double total_points);// calculates highest points achieved
double calc_min(double the_min, double total_points);// calculates lowest points
double get_points();// acqures private member "total_points"
private:
string name_first, name_last;
char letter_grade;
double student_num, quiz_1, quiz_2, mid_exam, final_exam;
double total_points, percent_total;
};
student record1, record2, record3, record4, record5;
student record6, record7, record8, record9, record10;// student records
int n=0;
double average_score;
char average_grade;
void show_scores();// Displays output_info
void class_average();// Displays class average summary
void calc_class(); // calculates class total points for grade and average
void show_max();// displays highest points
void show_min();// displays lowest points
ofstream report;//ouputs the contents of show_results to student.txt file
int main()
{
char ans;
report.open("student.txt");
n++;
record1.get_info();
record1.get_scores();
record1.calc_grade();
class_total=0;
record1.calc_total();
cout << "Is there another student's scores that need to be processed?";
cout << endl;
cout << "Press 'y' or 'Y' for yes or 'n' for Class Summary.";
cin >> ans;
cout << endl;
while (ans == 'n' || ans == 'N')
{
show_scores();
calc_class();
class_average();
system("PAUSE");
return 0;
}
n++;
record2.get_info();
record2.get_scores();
record2.calc_grade();
record2.calc_total();
cout << "Is there another student's scores that need to be processed?";
cout << endl;
cout << "Press 'y' or 'Y' for yes or 'n' for Class Summary.";
cin >> ans;
cout << endl;
while (ans == 'n' || ans == 'N')
{
show_scores();
calc_class();
class_average();
system("PAUSE");
return 0;
}
n++;
record3.get_info();
record3.get_scores();
record3.calc_grade();
record3.calc_total();
cout << "Is there another student's scores that need to be processed?";
cout << endl;
cout << "Press 'y' or 'Y' for yes or 'n' for Class Summary.";
cin >> ans;
cout << endl;
while (ans == 'n' || ans == 'N')
{
show_scores();
calc_class();
class_average();
system("PAUSE");
return 0;
}
n++;
record4.get_info();
record4.get_scores();
record4.calc_grade();
record4.calc_total();
cout << "Is there another student's scores that need to be processed?";
cout << endl;
cout << "Press 'y' or 'Y' for yes or 'n' for Class Summary.";
cin >> ans;
cout << endl;
while (ans == 'n' || ans == 'N')
{
show_scores();
calc_class();
class_average();
system("PAUSE");
return 0;
}
n++;
record5.get_info();
record5.get_scores();
record5.calc_grade();
record5.calc_total();
cout << "Is there another student's scores that need to be processed?";
cout << endl;
cout << "Press 'y' or 'Y' for yes or 'n' for Class Summary.";
cin >> ans;
cout << endl;
while (ans == 'n' || ans == 'N')
{
show_scores();
calc_class();
class_average();
system("PAUSE");
return 0;
}
n++;
record6.get_info();
record6.get_scores();
record6.calc_grade();
record6.calc_total();
cout << "Is there another student's scores that need to be processed?";
cout << endl;
cout << "Press 'y' or 'Y' for yes or 'n' for Class Summary.";
cin >> ans;
cout << endl;
while (ans == 'n' || ans == 'N')
{
show_scores();
calc_class();
class_average();
system("PAUSE");
return 0;
}
n++;
record7.get_info();
record7.get_scores();
record7.calc_grade();
record7.calc_total();
cout << "Is there another student's scores that need to be processed?";
cout << endl;
cout << "Press 'y' or 'Y' for yes or 'n' for Class Summary.";
cin >> ans;
cout << endl;
while (ans == 'n' || ans == 'N')
{
show_scores();
calc_class();
class_average();
system("PAUSE");
return 0;
}
n++;
record8.get_info();
record8.get_scores();
record8.calc_grade();
record8.calc_total();
cout << "Is there another student's scores that need to be processed?";
cout << endl;
cout << "Press 'y' or 'Y' for yes or 'n' for Class Summary.";
cin >> ans;
cout << endl;
while (ans == 'n' || ans == 'N')
{
show_scores();
calc_class();
class_average();
system("PAUSE");
return 0;
}
n++;
record9.get_info();
record9.get_scores();
record9.calc_grade();
record9.calc_total();
cout << "Is there another student's scores that need to be processed?";
cout << endl;
cout << "Press 'y' or 'Y' for yes or 'n' for Class Summary.";
cin >> ans;
cout << endl;
while (ans == 'n' || ans == 'N')
{
show_scores();
calc_class();
class_average();
system("PAUSE");
return 0;
}
n++;
record10.get_info();
record10.get_scores();
record10.calc_grade();
record10.calc_total();
show_scores();
calc_class();
class_average();
system("PAUSE");
return 0;
}
void student::get_info()
{
cout << "Please enter the following:\n" << endl;
cout << "Student ID number:";
cin >> student_num;
while (student_num < 1 || student_num > 99999)
{
cout << "Invalid Student ID number.\n";
cout << "Please enter again.\n";
cin >> student_num;
}
cout << "First name:";
cin >> name_first;
cout << "Last name:";
cin >> name_last;
}
void student::get_scores()
{
cout << "Quiz #1 score:";
cin >> quiz_1;
while (quiz_1 < 0 || quiz_1 > 25)
{
cout << "Invalid quiz score.\n";
cout << "Please enter again.\n";
cin >> quiz_1;
}
cout << "Quiz #2 Score:";
cin >> quiz_2;
while (quiz_2 < 0 || quiz_2 > 25)
{
cout << "Invalid quiz score.\n";
cout << "Please enter again.\n";
cin >> quiz_2;
}
cout << "Midterm exam score:";
cin >> mid_exam;
while (mid_exam < 0 || mid_exam > 50)
{
cout << "Invalid exam score.\n";
cout << "Please enter again.\n";
cin >> mid_exam;
}
cout << "Final exam score:";
cin >> final_exam;
while (final_exam < 0 || final_exam > 100)
{
cout << "Invalid exam score.\n";
cout << "Please enter again.\n";
cin >> final_exam;
}
}
void student::calc_grade()
{
total_points = (quiz_1 + quiz_2 + mid_exam + final_exam);
percent_total = (100)*((quiz_1 + quiz_2 + mid_exam + final_exam)/200);
if (percent_total >= 90)
{
letter_grade = 'A';
}
else if (percent_total >= 80)
{
letter_grade = 'B';
}
else if (percent_total >= 70)
{
letter_grade = 'C';
}
else if (percent_total >= 60)
{
letter_grade = 'D';
}
else
{
letter_grade = 'F';
}
}
void student::output_info()
{
cout << endl << "Summary:" << endl;
cout << "ID number:";
cout << student_num << endl;
cout << "Name:";
cout << name_first <<" "<< name_last << endl;
cout << "Quiz #1 score:";
cout << quiz_1 << endl;
cout << "Quiz #2 score:";
cout << quiz_2 << endl;
cout << "Midterm exam score:";
cout << mid_exam << endl;
cout << "Final exam score:";
cout << final_exam << endl;
cout << "Total points earned:";
cout << total_points << endl;
cout << "Percent Total:";
cout << percent_total << "%" << endl << endl;
cout << "Grade:";
cout << letter_grade << endl << endl;
}
void calc_class()
{
double percent;
average_score = class_total/n;
percent = 100*(average_score/200);
if (percent >= 90)
{
average_grade = 'A';
}
else if (percent >= 80)
{
average_grade = 'B';
}
else if (percent >= 70)
{
average_grade = 'C';
}
else if (percent >= 60)
{
average_grade = 'D';
}
else
{
average_grade = 'F';
}
}
void show_scores()
{
record1.output_info();
if (n>1)
{
record2.output_info();
}
if (n>2)
{
record3.output_info();
}
if (n>3)
{
record4.output_info();
}
if (n>4)
{
record5.output_info();
}
if (n>5)
{
record6.output_info();
}
if (n>6)
{
record7.output_info();
}
if (n>7)
{
record8.output_info();
}
if (n>8)
{
record9.output_info();
}
if (n>9)
{
record10.output_info();
}
}
void student::calc_total()
{
class_total = class_total + total_points;
}
double student::calc_max(double the_max, double points)
{
if (points > the_max)
{
the_max = points;
}
return the_max;
}
double student::calc_min(double the_min, double points)
{
if (points < the_min && points > 0)
{
the_min = points;
}
return the_min;
}
void class_average()
{
cout << endl << "Class Summary" << endl << endl;
cout << "Number of students processed: " << n << endl;
cout << "Highest total points achieved: ";
show_max();
cout << endl;
cout << "Lowest total points achieved: ";
show_min();
cout << endl;
cout << "Average total points achieved: " << average_score << endl;
cout << "Average letter grade achieved: " << average_grade << endl << endl;
}
void show_max()
{
double max = 0;
max = record1.calc_max(max, record1.get_points());
max = record2.calc_max(max, record2.get_points());
max = record3.calc_max(max, record3.get_points());
max = record4.calc_max(max, record4.get_points());
max = record5.calc_max(max, record5.get_points());
max = record6.calc_max(max, record6.get_points());
max = record7.calc_max(max, record7.get_points());
max = record8.calc_max(max, record8.get_points());
max = record9.calc_max(max, record9.get_points());
max = record10.calc_max(max, record10.get_points());
cout << max;
}
void show_min()
{
double min = 200;
min = record1.calc_min(min, record1.get_points());
min = record2.calc_min(min, record2.get_points());
min = record3.calc_min(min, record3.get_points());
min = record4.calc_min(min, record4.get_points());
min = record5.calc_min(min, record5.get_points());
min = record6.calc_min(min, record6.get_points());
min = record7.calc_min(min, record7.get_points());
min = record8.calc_min(min, record8.get_points());
min = record9.calc_min(min, record9.get_points());
min = record10.calc_min(min, record10.get_points());
cout << min;
}
double student::get_points()
{
return total_points;
}First, declare ofstream report; within main() so it's not global. Then, for your function output_info, pass report in by reference (so you'll have to change your declaration of output_info to report this). Make sure you do the opening of your file within main() first before you pass it into anything.
Now anywhere there is a cout at the present (so cout << "ID number:"; becomes report <<"ID number:"; . Any other functions that need it, do the same thing, pass that ofstream report in by reference.
The direction of your << or >> operator should reflect whether you are taking data into a variable from a stream or outputting to a stream.
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