Use the file processing example program shown at the bottom. Modify the program to enter the...
Use the file processing example program shown at the bottom. Modify the program to enter the grades, and count number of grades. Also get total and average grade. Use the following data for grades: 79, 99, 85, 97, 88, 95, 100, 87, 94 EXAMPLE OUTPUT Total: 9 grades Total grade sum: 824 Average grade: 92 Letter grade: A / Using Break, and Continue #include "stdafx.h" #include using namespace std; int main() { int i = 0; for (int x = 1; x <= 5; x++) { for (int y = 1; y <= 3; y++) { if (y == 2) break; //substitute break with continue to see what happens cout << "x " << x << " y " << y << endl; } cout << "x " << x << endl; } return 0; } // Writing and reading a file //From page 274, write to output file #include "stdafx.h" #include #include #include using namespace std; int main() { ofstream outputFile; //ouput file ifstream inputFile; //input file outputFile.open("demofile.txt"); cout << "Write data to a file \n"; outputFile << "One \n"; outputFile << "Two \n"; outputFile << "Three \n"; outputFile.close(); //close the file cout << "Done \n"; //From page 279, Open file string name; cout << "read the file \n"; inputFile.open("demofile.txt"); while(inputFile >> name) cout << name << endl; inputFile.close(); //close the file cout << "All done \n"; return 0; }
Homework Answers
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
ifstream inputFile("input.txt");//Open input file to read grades
if(inputFile.fail())//Check if file has been opened successfully or not
{
cout << "Error: Cannot open file";
exit(EXIT_FAILURE);
}
int grade, count = 0;
float total = 0, average;
char letterGrade;
while(!inputFile.eof())
{
inputFile >> grade;//Read a grade from the file
count++;
total += grade;
}
inputFile.close();//Close file
average = ceil(total/count);//Calculate average grade
//Find letter grade
if(average >= 90)
letterGrade = 'A';
else
if(average >= 80)
letterGrade = 'B';
else
if(average >= 70)
letterGrade = 'C';
else
if(average >= 60)
letterGrade = 'D';
else
if(average >= 50)
letterGrade = 'E';
else
letterGrade = 'F';
//Print stats
cout << "Total: " << count << " grades" << endl;
cout << "Total grade sum: " << total << endl;
cout << "Average grade: " << average << endl;
cout << "Letter grade: " << letterGrade << endl;
return 0;
}
OUTPUT:
INSTRUCTIONS ON WHERE TO PLACE INPUT.TXT FILE:
Add Answer to:
Use the file processing example program shown at the bottom.
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