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#include <iostream>
#include <iomanip>
#include <cmath>
#include <fstream>
using namespace std;
// prototypes for functions
float average(float, float, float);
float lettergrade(float);
float validgrades(float, float, float);
// OUTFILE CALL
ofstream outfile("hwfour.out");
int i;
int main()
{
float num1, num2, num3, avg;
int p, i, v;
char grade;
avg = 1;
p = 0;
i = 0;
v = 0;
ifstream infile("hw4.dat");
{
outfile << setiosflags(ios::left) << setw(10) << "GRADE 1" << setiosflags(ios::left) << setw(10)
<< "GRADE 2" << setiosflags(ios::left) << setw(10)
<< "GRADE 3" << setiosflags(ios::left) << setw(10) << "AVERAGE" << setiosflags(ios::left) << setw(10) << "GRADE"
<< setiosflags(ios::left) << setw(10) << "Groups" << setiosflags(ios::left) << setw(10) << "Invlid "
<< setiosflags(ios::left) << setw(10) << "Valid ";
}
while (avg != 101)
{
ifstream input;
input.open("hw4.dat");
for (p = 0; p < 15; p++)
{
{ cout << " Please enter your 3 grades seperated by spaces " << endl;
infile >> num1;
infile >> num2;
infile >> num3;
}
validgrades(num1, num2, num3);// function call
avg = average(num1, num2, num3);// function call
std::cout << "Your Average is:" << endl << avg << endl;
grade = lettergrade(avg); //function call
std::cout << "Your Grade is:" << endl << grade << endl;
}
std::cout << "The Number of groups Processed is" << endl << p << endl;
std::cout << "Invalid Groups" << endl << i << endl;
std::cout << "Valid Groups" << endl << v << endl;
outfile << setiosflags(ios::fixed) << setprecision(2) << setiosflags(ios::left) << setw(10) << endl
<< num1 << setiosflags(ios::left) << setw(10) << num2 << setiosflags(ios::left) << setw(10)
<< num3 << setiosflags(ios::left) << setw(10) << avg << setiosflags(ios::left) << setw(10) << grade
<< setiosflags(ios::left) << setw(10) << p << setiosflags(ios::left) << setw(10) << i << setiosflags(ios::left) << setw(10) << v;
}
{
infile.close();
outfile.close();
return 0;
}
}
// this function calculates the average of 3 numbers
float average(float a, float b, float c) //a,b and c are justpalce holders
{
return(a + b + c) / 3;
}
// this function validates the grades inputed
float validgrades(float a, float b, float c)
{
{
if (a > 100)
std::cout << "Your number is invalide, it is too big";
return 1;
if (a < 0)
std::cout << "Your number is invalid, it is too small";
return 1;
if (b > 100)
std::cout << "Your number is invalide, it is too big";
return 1;
if (b < 0)
std::cout << "Your number is invalid, it is too small";
return 1;
if (c > 100)
std::cout << "Your number is invalide, it is too big";
return 1;
if (c < 0)
std::cout << "Your number is invalid, it is too small";
return 1;
}
}
// this function assigns letter grades to the average given
float lettergrade(float a)
{
if (a >= 90.00)
return 'A';
else
if (a >= 80.00)
return 'B';
else
if (a >= 70.00)
return 'C';
else
if (a >= 60.00)
return 'D';
else
return 'F';
}
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