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#include<iostream>
#include<iomanip>
#include<fstream>
#include<string>
#include<cmath>
using namespace std;
int studentdetails_mean();
double standard_deviation();
void barchart();
int main(){
int number_stud[5],sum=0;
double exam_marks[5],mean=0;
string student_name;
ifstream infile; // input file
ofstream outfile; //output file
infile.open("input.txt");
outfile.open("output.txt");
if(!outfile){ //if cannot open the file
cout<<"Cannot open file."<<endl;
return 1;
}
string data;
while(!infile.eof()){
getline(infile,data);
cout<<data<<endl; //output to terminal window
}
studentdetails_mean(mean);
standard_deviation(std_dev);
barchart();
infile.close();
outfile.close();
system("pause");
return 0;
}
int studentdetails_mean(int mean){
ofstream outfile;
outfile.open("output.txt");
string student_name;
int exam_marks[5],sum=0;
for(int x=0;x<5;x++){
cout<<"Please enter the student name: ";
cin>>student_name;
cout<<"Please enter the examination marks: ";
cin>>exam_marks[x];
sum=sum+exam_marks[x];
}
mean=sum/5;
outfile<<"The mean is "<<mean<<endl;
outfile.close();
return mean;
}
double standard_deviation(double std_dev){
ofstream outfile;
outfile.open("output.txt");
int exam_marks[5],students=5,mean,sum=0;
double sox_m,s=0;
int nminus=4;
for(int ii=0;ii<students;ii++){
mean;
s=s+((exam_marks[ii]-mean)*(exam_marks[ii]-mean));
}
std_dev=sqrt(s/nminus);
cout<<"The standard deviation is: "<<std_dev<<endl;
outfile<<"The standard deviation is: "<<std_dev<<endl;
outfile.close();
return std_dev;
}
void barchart(){
ofstream outfile;
outfile.open("output.txt");
int G_A=0,G_B=0,G_C=0,G_D=0,G_F=0,exam_marks[5];
for(int x=0;x<5;x++){
if(exam_marks[x]<=39.9){
cout<<"Grade F"<<setw(15)<<endl;
outfile<<"Grade F";
cout<<"*"<<endl;
outfile<<"*"<<endl;
G_F++;
}else if(exam_marks[x]<=49.9){
cout<<"Grade D"<<setw(15)<<endl;
outfile<<"Grade D";
cout<<"*"<<endl;
outfile<<"*"<<endl;
G_D++;
}else if(exam_marks[x]<=69.9){
cout<<"Grade C"<<setw(15)<<endl;
outfile<<"Grade C";
cout<<"*"<<endl;
outfile<<"*"<<endl;
G_C++;
}else if(exam_marks[x]<=79.9){
cout<<"Grade B"<<setw(15)<<endl;
outfile<<"Grade B";
cout<<"*"<<endl;
outfile<<"*"<<endl;
G_B++;
}else if(exam_marks[x]<=100){
cout<<"Grade A"<<setw(15)<<endl;
outfile<<"Grade A";
cout<<"*"<<endl;
outfile<<"*"<<endl;
G_A++;
}
outfile.close();
}
}
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