#include <string> #include <fstream> #include <iostream> #include <sstream> #inc

Question

#include <string>
#include <fstream>
#include <iostream>
#include <sstream>
#include <iomanip>
using namespace std;

int main(){
string name[3];
int tmpScore, studentTotal, minScore, maxScore, countStudent, countClass;
double classTotal;
minScore = 100;
maxScore = 0;
classTotal = 0.0;
countClass = 0;

cout << setw(20) << left << "students";
cout << setw(5) << left << "Data" << endl;
while(!namelist.eof()){
for(int i=0;i<3;i++){
namelist >> name[i];
}
studentDat.open((name[1]+name[0]+".dat").c_str());
studentTotal = countStudent = 0;
while(!studentDat.eof()){
studentDat >> tmpScore;

if(tmpScore>maxScore){
maxScore = tmpScore;
}
if(tmpScore>maxScore){
minScore = tmpScore;
}
studentTotal += tmpScore;
countStudent ++;
}
studentDat.close();
classTotal += (double)studentTotal / (double)countStudent;
countClass++;

cout<<setw(20)<<left
<<name[0] + " "
<<name[1] + " "
<<name[2];
cout<<setprecision(2)<<fixed
<<(double)studentTotal/(double)countStudent
<<endl;
}
cout << setw(20)<<left<<"Class Average:";
cout << (double)classTotal/(double)countClass
<<endl;
cout << setw(20) << left << "Max Score:";
cout << (double)maxScore << endl;
cout << setw(20) << left << "min Score:";
cout << (double)minScore << endl;
namelist.close();

return 0;
}

namelist and studentDat was not declared, how to fix it?

and if this program is right?

Explanation / Answer

I have added the declaration of studentDat and namelist variable in below program.

#include <string>
#include <fstream>
#include <iostream>
#include <sstream>
#include <iomanip>
using namespace std;
int main(){
string name[3];
int tmpScore, studentTotal, minScore, maxScore, countStudent, countClass;
ifstream studentDat;
ifstream namelist; //Please write the open command to open require file.
double classTotal;
minScore = 100;
maxScore = 0;
classTotal = 0.0;
countClass = 0;
cout << setw(20) << left << "students";
cout << setw(5) << left << "Data" << endl;
while(!namelist.eof()){
for(int i=0;i<3;i++){
namelist >> name[i];
}
studentDat.open((name[1]+name[0]+".dat").c_str());
studentTotal = countStudent = 0;
while(!studentDat.eof()){
studentDat >> tmpScore;
if(tmpScore>maxScore){
maxScore = tmpScore;
}
if(tmpScore>maxScore){
minScore = tmpScore;
}
studentTotal += tmpScore;
countStudent ++;
}
studentDat.close();
classTotal += (double)studentTotal / (double)countStudent;
countClass++;
cout<<setw(20)<<left
<<name[0] + " "
<<name[1] + " "
<<name[2];
cout<<setprecision(2)<<fixed
<<(double)studentTotal/(double)countStudent
<<endl;
}
cout << setw(20)<<left<<"Class Average:";
cout << (double)classTotal/(double)countClass
<<endl;
cout << setw(20) << left << "Max Score:";
cout << (double)maxScore << endl;
cout << setw(20) << left << "min Score:";
cout << (double)minScore << endl;
namelist.close();
return 0;
}

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