Question

Create a function named PrintStudents, which takes a string input filename and an integer minimum score value and a string output file name as a parameters. The function will read the student scores and names from the file and output the names of the students with scores greater than or equal to the value given. This function returns the integer number of entries read from the file. If the input file cannot be opened, return -1 and do not print anything to the file.Read each line from the given filename, parse the data, process the data, and write the required information to the file.Each line of the file contains , , . Read and parse the data, then write to the output file the names and classes for scores matching the criteria.Example: With the following data and value of 80:Constance Shelton, 67, APPM 2002Charlotte Edwards, 85, CSCI 1300Alyssa Hill, 78, MATH 1000Pat Owens, 75, HUMN 1342Shannon Jimenez, 96, LING 2000Kristen Swanson, 80, PSYC 1001Jim Schwartz, 60, CVEN 3241Your function should return 7 and output to the file should contain:Charlotte Edwards, CSCI 1300Shannon Jimenez, LING 200Kristen Swanson, PSYC 1001You only need to write the function code. Our code will create and test your class.HINT: We have provided a function that may make the parsing easier:int split(string s, char sep, string words[], int max_words);

Answer 1

Answer:

The code is implemented below on C++

Explanation:

#include <iostream>

#include <fstream>

#include <string>

using namespace std;

// function declaration

int PrintStudents(string inputFile, int min_score,string outputFile);

int split(string s,char sep, string words[], int max_words );

int main() {

// test the function

              int n = PrintStudents("students.txt",80,"outStudents.txt");

              if(n != -1)

                             cout<<"\n No. of students : "<<n<<endl;

              else

                             cout<<"\n No such file exists";

              return 0;

}

// function to write the details of the students whose score >= min_score

// inputs : input file, minimum score and output file

// output : number of records read, -1 if error

int PrintStudents(string inputFile, int min_score,string outputFile)

{              // open the input file

              ifstream fin(inputFile.c_str());

              // if input file can be opened

              if(fin.is_open())

              {              // open the output file for writing

                             ofstream fout(outputFile.c_str());

                             int n=0,score;

                             string line;

                             string words[3];

                             // read till the end of file

                             while(!fin.eof())

                             {

                                            getline(fin,line);

                                            n++;

                                            // get the score from the record read

                                            score = split(line,',',words,3);

                                            // check if score>=min_score, then write to output file

                                            if(score >= min_score)

                                                           fout<<words[0]<<", "<<words[2]<<"\n";

                                            if(fin.eof())

                                                           break;

                             }

                             // close the files

                             fin.close();

                             fout.close();

                             return n; // return the number of records read

              }else

              {

                             fin.close();

                             return -1; // file not found

              }

}

// function to split a string on a given separator and return the score

// inputs : string , word separator, array of words and max_words

// output is the score

int split(string s,char sep, string words[], int max_words )

{

              int index=0,i=0 ;

              //loop to extract the words from the line

              while(s.find(sep,index+1)!= -1){

                             words[i] = s.substr(index,s.find(sep,index+1)-index);

                             i++;

                             index = s.find(sep,index+1)+2;

              }

              words[i] = s.substr(index); // extract the last word

              // convert to integer and return the score

              return(stoi(words[1]));

}