Ich schreibe Code, um Schüler und Klassenobjekte einzugeben, sie zu sortieren, ein durchschnittliches gpa zu berechnen und sie in eine Datei auszugeben. Mein aktuelles Problem ist, dass die Ausgabe meiner Schülerobjekte gegeben ist, nachdem ich sie sortiert und ausgedruckt habe, aber der Code scheint die Schleife nicht zu verlassen, wenn ich das tue. Ich habe eine Druckfunktion, in der ich einen Ofstream passiere. Aus dem Debuggen weiß ich, dass das Out-of-Stream-Objekt alles liest, aber dann scheint es einzufrieren und nichts anderes auszugeben. Kann mir jemand sagen, ob ich falsch durch einen Verweis gegangen bin oder ob ich etwas anderes machen muss? Der Fehler, bei dem der Compiler nicht weiter durchgegangen ist, ist im Code markiert.Wie gibt man ein Objekt aus?
Sorry, so für weitere Informationen, unter einem es von schnippeln ist, was
Hinweis ausgeführt wird, wie „bekam durch sie“ wird nur einmal angezeigt. Ich weiß, dass es kein Problem ist, die Datei zu öffnen und auszugeben, weil sie tatsächlich das richtige Material ausgegeben hat. Zur Korrektur kompiliert der Compiler sogar alles in Ordnung. Es ist zur Laufzeit, wo das Terminal aussetzt und nichts mehr ausgegeben wird.
#include <vector>
#include <algorithm>
#include <iostream>
#include <sstream>
#include <iomanip>
#include <fstream>
#include <string>
#include "Grade.h"
#include "Student.h"
using namespace std;
const double A_NUM = 4.0, B_NUM = 3.0, C_NUM = 2.0, D_NUM = 1.0, E_NUM = 0.0, B_PLUSSNUM = 3.4, C_PLUSSNUM = 2.4, D_PLUSSNUM = 1.4;
const double A_MINUSNUM = 3.7, B_MINUSNUM = 2.7, C_MINUSNUM = 1.7, D_MINUSNUM = 0.7;
const int FIRST_INDEX= 0;
const int START_NUM = 0;
const int LESS_ONE = 1, ABOVE_ONE = 1;
const int START_GRADE = 0;
void calcgrades(vector<Grade>& grades)//function that calculates gpa based on letter grades
{
const string A = "A", A_MINUS = "A-", B_PLUSS = "B+", B = "B", B_MINUS = "B-", C_PLUSS = "C+", C = "C", C_MINUS = "C-", D_PLUSS = "D+", D = "D", D_MINUS = "D-", E = "E";
int counter = START_NUM;//used to keep track of current student and current total grade
double current_grade = START_NUM;
for(int i = 0; i < grades.size();i++)
{
//while loop to get the student's current total grade if the next student id is different than the first one.
while(i < grades.size()-LESS_ONE && grades[i].getid() == grades[i+ABOVE_ONE].getid())
{
if (grades[i].getgrade() == A)
{
current_grade == A_NUM + current_grade;
}
if (grades[i].getgrade() == B)
{
current_grade == B_NUM + current_grade;
}
if (grades[i].getgrade() == C)
{
current_grade == C_NUM + current_grade;
}
if (grades[i].getgrade() == D)
{
current_grade == D_NUM + current_grade;
}
if (grades[i].getgrade() == E)
{
current_grade == E_NUM + current_grade;
}
if (grades[i].getgrade() == B_PLUSS)
{
current_grade == B_PLUSSNUM + current_grade;
}
if (grades[i].getgrade() == C_PLUSS)
{
current_grade == C_PLUSSNUM + current_grade;
}
if (grades[i].getgrade() == D_PLUSS)
{
current_grade == D_PLUSSNUM + current_grade;
}
if (grades[i].getgrade() == A_MINUS)
{
current_grade == A_MINUSNUM + current_grade;
}
if (grades[i].getgrade() == B_MINUS)
{
current_grade = B_MINUSNUM + current_grade;
}
if (grades[i].getgrade() == C_MINUS)
{
current_grade = C_MINUSNUM + current_grade;
}
if (grades[i].getgrade() == D_MINUS)
{
current_grade = D_MINUSNUM + current_grade;
}
}
if (grades[i+ABOVE_ONE].getid() != grades[i].getid() || i == grades.size()-LESS_ONE)
{
//computes the average if the currentid is not equal to the nextid
double avggpa = current_grade/counter;
grades[i].newgpa(avggpa);
counter = START_NUM;//resets counter for a new student to get his gpa
}
counter++;
}
}
int main(int argc, char* argv[])
{
string student_file, grades_file, idnum, name, address, pnum, course, gletter;
//creates student and grade objects from respective classes
vector<Student> students;
vector<Grade> grades;
student_file = argv[1];
//reads in information from file to import into student objects
ifstream sfile;
sfile.open(student_file);
while(getline(sfile, idnum))//gets the student information from student file
{
getline(sfile, name);
getline(sfile, address);
getline(sfile, pnum);
//creates student objects to import info. into, and inserts into students vector
Student s(idnum, name, address, pnum);
students.push_back(s);
}
sfile.close();
//opens information from the grade file
grades_file = argv[2];
//reads from file to import into grades objects
ifstream gfile;
gfile.open(grades_file);
//gets the grade information from the grades file
while(getline(gfile, course))
{
getline(gfile, idnum);
getline(gfile, gletter);
//creates grade objects to import info, and inserts into grades vector
Grade g(course, idnum, gletter, START_GRADE);
grades.push_back(g);
}
gfile.close();
//reads the query file
string query_file;
query_file = argv[3];
ifstream qfile;
qfile.open(query_file);
//reads from query file
//creates vector to store each student number
vector<string> query_nums;
string incheck;
while(getline(qfile, incheck))
{
query_nums.push_back(incheck);
}
qfile.close();
//sorts the information for the students
sort(students.begin(), students.end());
//sorts the information for the grades
sort(grades.begin(), grades.end());
ofstream outtxt;
string out_file = argv[4];
outtxt.open(out_file);
//outputs the student information, sorted now.
for(int i = 0; i < students.size();i++)
{
students[i].print(outtxt);
outtxt << "got through it";
}
//compiler did not get past here!
outtxt << "We're here!";
//outputs the grades with student id's, now sorted
for (int i = 0; i < grades.size(); i++)
{
grades[i].print(outtxt);
outtxt << "\n\n" << "so gay!";
}
//calculates the average gpa for every student
calcgrades(grades);
for(int i = 0; i < query_nums.size(); i++)//goes through each query number to check first
{
for (int j = 0; j < students.size(); j++)//after, goes through each student object
{
if (query_nums[i] == students[j].getid())
{
//finds the gpa in the grades class that matches the student id
for (int k = 0; k < grades.size(); k++)
{
if (grades[k].getid() == query_nums[i])//
{
//outputs the resulting id, avg gpa, and name of matching students
outtxt << grades[i].getid() << "\tthere is nothinghere" << grades[i].getgpa() << "\t" << students[i].getname();
}
}
}
}
}
outtxt.close();
return 0;
}
Schüler-Klasse mit Druckfunktion
Schüler CPP-Datei
#include "Student.h"
#include <iostream>
#include <string>
#include <iomanip>
#include <fstream>
using namespace std;
//Student constructor, used to make student objects
Student::Student(string id,string nm,string add,string pnumber)
{
idnum = id;
name = nm;
address = add;
pnum = pnumber;
}
void Student::print(ofstream& out)
{
out << name << endl << idnum << endl << pnum << endl << address << endl;
}
string Student::getname()
{
//returns the student name
return name;
}
string Student::getid()
{
return idnum;
}
Bitte senden Sie uns eine [Minimal , Komplettes, überprüfbares Beispiel] (http://stackoverflow.com/help/mcve) –
Bitte fügen Sie den Compiler-Fehler –