Question

Write a C++ program that computes student grades for an assignment as a percentage given each student's score and the total points. The final score must be rounded up to the nearest whole value using the ceil function in the <cmath header file and displayed as a percentage. You must also display the floating-point result up to 5 decimal places. You must use at least 2 functions: one to print the last name of the student and another function to compute and print the percentage as well as "Excellent" if the grade is greater than 90, "Well Done" if the grade is greater than 80, "Good" if the grade is greater than 70, "Need Improvement" if the grade is greater than or equal to 60, and "Fail" if the grade is less than 50. The main function is responsible for reading the input file and passing the appropriate arguments to your functions. Here is an example of what the input file might look like: Weems 50 60 Dale 51 60 R1chards 57 60 Smith 36 60 Toml in 44 60 B1rd 45 60 Here is an example of what the output of your program might look like: eens 83% .83333 Well Done Dale 85% .85000 ell Done Richards 95% .95000 Excellent Smith 60% .60000 Need Improvement Tomlin 73% .73333 Good Bird 75% .75000 Good

Answer 1

Here is the code:

#include <iostream>

#include <fstream> //for inputting the file

#include <string>

#include <cmath>

#include <iomanip> //for precision purpose

using namespace std;

// this function is used to print the name of the student in output

void print_name(string lastName)

{

cout << lastName << " ";

}

// this function prints remarks based on percentage of user

void print_remark(int per)

{

if (per > 90)

{

cout << "Excellent";

return;

}

if (per > 80 && per <= 90)

{

cout << "Well done";

return;

}

if (per > 70 && per <= 80)

{

cout << "Good";

return;

}

if (per >= 60 && per <= 70)

{

cout << "Need Improvement";

return;

}

if (per >= 50 && per < 60)

{

// no condition given for range 50-60

//would not do anything .....

}

if (per < 50)

{

cout << "Fail";

return;

}

}

int main()

{

string filePath;

cout << "Please mention the filepath: ";

cin >> filePath;

//to read data from the file

ifstream inputFile(filePath);

string lastName;

int obtained, maximum;

//every line of the file will be assumed to have one string

//and two numbers and will be read token by token.

while (inputFile >> lastName >> obtained >> maximum)

{

double per, per1;

//calculate percentage

per = (double)obtained / maximum;

per1 = per * 100;

print_name(lastName);

// here instead of just using integer part of per1

// u can use 'ceil' or 'floor' function as per your convenience

//using ceil function will get you 84(nearest upper integer) for .83333 and floor will get us 83(nearest lower integer)

// You can use ceil or floor instead of int below accordingly.

cout << (int)per1;

cout << "% ";

// std::fixed is used for printing trailing zeroes in decimal part eg:- 8.5000

// setprecision fixes the number of digits you want to print after decimal

cout << std::fixed;

cout << setprecision(5) << per << " ";

// this function prints necessary remarks based on percentage

print_remark((int)per1);

cout << "\n";

}

return 0;

}

Answer 2

#include <iostream>

#include <fstream> //for inputting the file

#include <string>

#include <cmath>

#include <iomanip> //for precision purpose

using namespace std;

// this function is used to print the name of the student in output

void print_name(string lastName)

{

cout << lastName << " ";

}

// this function prints remarks based on percentage of user

void print_remark(int per)

{

if (per > 90)

{

cout << "Excellent";

return;

}

if (per > 80 && per <= 90)

{

cout << "Well done";

return;

}

if (per > 70 && per <= 80)

{

cout << "Good";

return;

}

if (per >= 60 && per <= 70)

{

cout << "Need Improvement";

return;

}

if (per >= 50 && per < 60)

{

// no condition given for range 50-60

//would not do anything .....

}

if (per < 50)

{

cout << "Fail";

return;

}

}

int main()

{

string filePath;

cout << "Please mention the filepath: ";

cin >> filePath;

//to read data from the file

ifstream inputFile(filePath);

string lastName;

int obtained, maximum;

//every line of the file will be assumed to have one string

//and two numbers and will be read token by token.

while (inputFile >> lastName >> obtained >> maximum)

{

double per, per1;

//calculate percentage

per = (double)obtained / maximum;

per1 = per * 100;

print_name(lastName);

// here instead of just using integer part of per1

// u can use 'ceil' or 'floor' function as per your convenience

//using ceil function will get you 84(nearest upper integer) for .83333 and floor will get us 83(nearest lower integer)

// You can use ceil or floor instead of int below accordingly.

cout << (int)per1;

cout << "% ";

// std::fixed is used for printing trailing zeroes in decimal part eg:- 8.5000

// setprecision fixes the number of digits you want to print after decimal

cout << std::fixed;

cout << setprecision(5) << per << " ";

// this function prints necessary remarks based on percentage

print_remark((int)per1);

cout << "\n";

}

return 0;

}