Question

Hello I need a small fix in my program. I need to display the youngest student and the average age of all of the students. It is not working Thanks.

#include <iostream>

#include <iomanip>

#include <fstream>

#include <vector>

#include <algorithm>

using namespace std;

struct Student {

string firstName;

char middleName;

string lastName;

char collegeCode;

int locCode;

int seqCode;

int age;

};

struct sort_by_age {

inline bool operator() (const Student& s1, const Student& s2)

{

return (s1.age < s2.age); // sort according to age of student

}

};

// main function to run program

int main() {

//CHANGE: vector students; TO vector students;

vector<Student> students; // create vector object to hold students data

ifstream Myfile; // create input file stream object

Myfile.open("a2data.txt"); // open file

// check if file is open

if (!Myfile.is_open()) {

// display error message if file could not be opened

cout << "Could not open the file!";

return 0; //terminate

}

//CHANGE: vector words; TO vector words;

vector<string> words; // create vector object to store words from input file

//read input from file line by line

string line;

while (!Myfile.eof()) {

getline(Myfile, line); // readline from input file stream

line.c_str(); // convert string in to char array

// file given in eample does not contain one record each line

// but it hase some patern for reading

// each word is seprated by space

//read the liine till space is encountered and get the word

int i = 0; // iterator to iterate over line

string word = "";

while (line[i] != '\0') {

// loop till end of line

if (line[i] != ' ') {

word = word + line[i]; // build word with char

i++;

}

else {

if(word!="")

words.push_back(word); // add word to vector

word = ""; //reset word to empty string

i++; //ignore white space

}

}//end of line

words.push_back(word); // add word to vector

}//end of file

//when done reading input from file close the file stream

Myfile.close();

int count = 0; // counts the words proceesed from vector object words

string fname = words.at(count); // variable to store first name of student

count++; //move to next element in the vector

//CHANGE: count < words.size() TO count < words.size() - 2

// at least two words are read in an iteration, so at least two should remain to be read - last name + student id

while (count < words.size() - 2) {

// loop till end of vector words

// create student object

Student s;

//assign first name to student

s.firstName = fname;

//next element in words is middle name

//assign first char to middle name

string mname = words.at(count);

s.middleName = mname[0];

count++;

//next element is last name of student

//assign next word to student

s.lastName = words.at(count);

//CHANGE: start

//If there was no middle name, this is the student id + first name of next student

if(words.at(count).size() >= 12) // college code + locCode + seq + age

{

if(words.at(count)[1] >= '0' && words.at(count)[1] <= '9') // if second character is a digit

{

// this is the student id field, and there is no middle name

count --; // move one step back for next iteration

s.middleName = ' '; //blank middle name

s.lastName = words.at(count);

}

}

//CHANGE: end

count++;

//next element is student id + first name of next student

//id contains college code at first latter

string id = words.at(count);

count++;

//assign college code to the student

s.collegeCode = id[0];

//next 2 char in id contain location

string loc = "";

loc = loc + id[1];

loc = loc + id[2];

// assign location to student

s.locCode = stoi(loc); // convert string to integer

//next 6 char in id contain seqcode

string seq = "";

for (int j = 3; j < 9; j++) {

seq = seq + id[j];

}

// assign seqcode to student

s.seqCode = stoi(seq); //convert string to int

//next 3 char in id contains age

string age = "";

age = age + id[9];

age = age + id[10];

age = age + id[11];

//assign age to student

s.age = stoi(age); // convert string to int

//remainig latters in id contains next student's first name

// delete id of previous student to get name of next student

fname = id.erase(0, 12); // delete first 12 char from id and assign remaining to fname

// add student to student

students.push_back(s);

}

// clear the vector as done working with words

words.clear();

//sort vector according to age of students

sort(students.begin(), students.end(), sort_by_age());

// formating output

cout << setw(15) << left << "Last Name";

cout << setw(15) << left << "Midlle Name";

cout << setw(15) << left << "First Name";

cout << setw(15) << left << "College Code";

cout << setw(12) << left << "Location";

cout << setw(12) << left << "Sequence";

cout << setw(12) << left << "Age" << endl;

cout << "=======================================================================================" << endl;

// print all students

for (int i = 0; i < students.size(); i++) {

cout << setw(15) << left << students.at(i).lastName;

cout << setw(15) << left << students.at(i).middleName;

cout << setw(20) << left << students.at(i).firstName;

cout << setw(13) << left << students.at(i).collegeCode;

cout << setw(10) << left << students.at(i).locCode;

cout << setw(12) << left << students.at(i).seqCode;

cout << students.at(i).age << endl;

}

//print average age

cout << endl;

  

int avg_age = ageCalc(arry, youngest);

cout<<"Average age is: "<<avg_age<<endl;

cout<<"Youngest student is "<<youngest->firstName<<" "<<youngest->MiddleN<<" "<<youngest->LastN<<endl;

for(int i=0; i<index; i++){

delete arry[i];

}

return 0;

}

int ageCalc(Student *studs[], Student *&youngest){

youngest = studs[0];

int i = 0;

int avg_age = 0;

while(studs[i]!=NULL){

avg_age += studs[i]->age;

if(youngest->age>studs[i]->age)

youngest = studs[i];

i++;

}

return avg_age/i;

}

File needed:

https://drive.google.com/file/d/15_CxuGnFdnyIj6zhSC11oSgKEYrosHck/view?usp=sharing

Answer 1

If you have any doubts, please give me comment...

#include <iostream>

#include <iomanip>

#include <fstream>

#include <vector>

#include <algorithm>

using namespace std;

#define MAX_SIZE 50

struct Student

{

    string firstName;

    char middleName;

    string lastName;

    char collegeCode;

    int locCode;

    int seqCode;

    int age;

};

struct sort_by_age

{

    inline bool operator()(const Student &s1, const Student &s2)

    {

        return (s1.age < s2.age); // sort according to age of student

    }

};

int ageCalc(Student *studs[], Student *&youngest);

// main function to run program

int main()

{

    //CHANGE: vector students; TO vector students;

    vector<Student> students;  // create vector object to hold students data

    ifstream Myfile;           // create input file stream object

    Myfile.open("a2data.txt"); // open file

    // check if file is open

    if (!Myfile.is_open())

    {

        // display error message if file could not be opened

        cout << "Could not open the file!";

        return 0; //terminate

    }

    //CHANGE: vector words; TO vector words;

    vector<string> words; // create vector object to store words from input file

    //read input from file line by line

    string line;

    while (!Myfile.eof())

    {

        getline(Myfile, line); // readline from input file stream

        line.c_str();          // convert string in to char array

        // file given in eample does not contain one record each line

        // but it hase some patern for reading

        // each word is seprated by space

        //read the liine till space is encountered and get the word

        int i = 0; // iterator to iterate over line

        string word = "";

        while (line[i] != '\0')

        {

            // loop till end of line

            if (line[i] != ' ')

            {

                word = word + line[i]; // build word with char

                i++;

            }

            else

            {

                if (word != "")

                    words.push_back(word); // add word to vector

                word = "";                 //reset word to empty string

                i++;                       //ignore white space

            }

        }                      //end of line

        words.push_back(word); // add word to vector

    }                          //end of file

    //when done reading input from file close the file stream

    Myfile.close();

    int count = 0;                  // counts the words proceesed from vector object words

    string fname = words.at(count); // variable to store first name of student

    count++;                        //move to next element in the vector

    //CHANGE: count < words.size() TO count < words.size() - 2

    // at least two words are read in an iteration, so at least two should remain to be read - last name + student id

    while (count < words.size() - 2)

    {

        // loop till end of vector words

        // create student object

        Student s;

        //assign first name to student

        s.firstName = fname;

        //next element in words is middle name

        //assign first char to middle name

        string mname = words.at(count);

        s.middleName = mname[0];

        count++;

        //next element is last name of student

        //assign next word to student

        s.lastName = words.at(count);

        //CHANGE: start

        //If there was no middle name, this is the student id + first name of next student

        if (words.at(count).size() >= 12) // college code + locCode + seq + age

        {

            if (words.at(count)[1] >= '0' && words.at(count)[1] <= '9') // if second character is a digit

            {

                // this is the student id field, and there is no middle name

                count--;            // move one step back for next iteration

                s.middleName = ' '; //blank middle name

                s.lastName = words.at(count);

            }

        }

        //CHANGE: end

        count++;

        //next element is student id + first name of next student

        //id contains college code at first latter

        string id = words.at(count);

        count++;

        //assign college code to the student

        s.collegeCode = id[0];

        //next 2 char in id contain location

        string loc = "";

        loc = loc + id[1];

        loc = loc + id[2];

        // assign location to student

        s.locCode = stoi(loc); // convert string to integer

        //next 6 char in id contain seqcode

        string seq = "";

        for (int j = 3; j < 9; j++)

        {

            seq = seq + id[j];

        }

        // assign seqcode to student

        s.seqCode = stoi(seq); //convert string to int

        //next 3 char in id contains age

        string age = "";

        age = age + id[9];

        age = age + id[10];

        age = age + id[11];

        //assign age to student

        s.age = stoi(age); // convert string to int

        //remainig latters in id contains next student's first name

        // delete id of previous student to get name of next student

        fname = id.erase(0, 12); // delete first 12 char from id and assign remaining to fname

        // add student to student

        students.push_back(s);

    }

    // clear the vector as done working with words

    words.clear();

    //sort vector according to age of students

    sort(students.begin(), students.end(), sort_by_age());

    // formating output

    cout << setw(15) << left << "Last Name";

    cout << setw(15) << left << "Midlle Name";

    cout << setw(15) << left << "First Name";

    cout << setw(15) << left << "College Code";

    cout << setw(12) << left << "Location";

    cout << setw(12) << left << "Sequence";

    cout << setw(12) << left << "Age" << endl;

    cout << "=======================================================================================" << endl;

    // print all students

    for (int i = 0; i < students.size(); i++)

    {

        cout << setw(15) << left << students.at(i).lastName;

        cout << setw(15) << left << students.at(i).middleName;

        cout << setw(20) << left << students.at(i).firstName;

        cout << setw(13) << left << students.at(i).collegeCode;

        cout << setw(10) << left << students.at(i).locCode;

        cout << setw(12) << left << students.at(i).seqCode;

        cout << students.at(i).age << endl;

    }

    //print average age

    cout << endl;

    //CHANGE vector to Student array

    Student *stud_arr[MAX_SIZE] = {NULL};

    for(int i=0; i<students.size(); i++)

        stud_arr[i] = &students[i];

    //CHANGE adding yougest student vector

    Student *youngest = NULL;

    int avg_age = ageCalc(stud_arr, youngest);

    cout << "Average age is: " << avg_age << endl;

    cout << "Youngest student is " << youngest->firstName << " " << youngest->middleName << " " << youngest->lastName << endl;

    // delete[] stud_arr;

    return 0;

}

int ageCalc(Student *studs[], Student *&youngest)

{

    youngest = studs[0];

    int i = 0;

    int avg_age = 0;

    while (studs[i] != NULL)

    {

        avg_age += studs[i]->age;

        if (youngest->age > studs[i]->age)

            youngest = studs[i];

        i++;

    }

    return avg_age / i;

}