When I compiled and ran the program it should at the end ask if they want to calculate another grade, but instead it automatically ends. Also I had it endl after anytime a incorrect input was recieved, yet it just ignores that and bunches the line like so:

You must select a Student Typeanon@SLACKWARE:~/cpp files/Grades$ WORK YOU FREAKING THING!
-bash: WORK: command not found
anon@SLACKWARE:~/cpp files/Grades$

//Created By Eclipse75
//Grades.cpp
#include <iostream>
#include <string>

int main()
{
using namespace std;

const float ENGLISH_MIDTERM_PERCENTAGE = .25;
const float ENGLISH_FINALEXAM_PERCENTAGE = .25;
const float ENGLISH_RESEARCH_PERCENTAGE = .30;
const float ENGLISH_PRESENTATION_PERCENTAGE = .20;
const float MATH_MIDTERM_PERCENTAGE = .5F;
const float MATH_FINALEXAM_PERCENTAGE = .50;
const float SCIENCE_MIDTERM_PERCENTAGE = .40;
const float SCIENCE_FINALEXAM_PERCENTAGE = .40;
const float SCIENCE_RESEARCH_PERCENTAGE = .20;
int midterm = 0;
int finalExamGrade = 0;
int research = 0;
int presentation = 0;
float finalNumericGrade = 0;
char finalLetterGrade;
char response[256];
string moreGradesToCalculate;

cout << "Do you want to calculate a grade? ";
cin >> moreGradesToCalculate;

for (int i = 0;
i < moreGradesToCalculate.length();i++) {
moreGradesToCalculate[i] =
toupper (moreGradesToCalculate[i]);
}
while (moreGradesToCalculate == "YES") {

// What type of student are we calculating?
cout << "Enter student type " <<
"(1=English, 2=Math, 3=Science): ";

cin.getline(response,256);

if (strlen(response) == 0) {
cout << "You must enter a student type" << endl;
return 1;
}

if ((atoi(response) < 1) | (atoi(response) > 3)) {
cout << response <<
" - is not a valid student type" << endl;
return 1;
}

// Student type is valid, now let's calculate the grade
switch(atoi(response))
{
// Case 1 is an English Student
case 1:
cout << endl << endl << "Enter the Midterm Grade: ";
cin.getline(response,256);
midterm = atoi(response);
cout << "Enter the Final Examination Grade: ";
cin.getline(response,256);
finalExamGrade = atoi(response);
cout << "Enter the Research Grade: ";
cin.getline(response,256);
research = atoi(response);
cout << "Enter the Presentation Grade: ";
cin.getline(response,256);
presentation = atoi(response);
finalNumericGrade =
(midterm * ENGLISH_MIDTERM_PERCENTAGE) +
(finalExamGrade * ENGLISH_FINALEXAM_PERCENTAGE) + (research * ENGLISH_RESEARCH_PERCENTAGE) +
(presentation * ENGLISH_PRESENTATION_PERCENTAGE);

if (finalNumericGrade >= 93)
finalLetterGrade = 'A';
else
if ((finalNumericGrade >= 85) &
(finalNumericGrade < 93))
finalLetterGrade = 'B';
else
if ((finalNumericGrade >= 78) &
(finalNumericGrade < 85))
finalLetterGrade = 'C';
else
if ((finalNumericGrade >= 70) &
(finalNumericGrade < 78))
finalLetterGrade = 'D';
else
if (finalNumericGrade < 70)
finalLetterGrade = 'F';
cout << endl << "***ENGLISH STUDENT***"
<< endl << endl;
cout << "Midterm grade is: " <<
midterm << endl;
cout << "Final Exam grade is: " <<
finalExamGrade << endl;
cout << "Research grade is: " <<
research << endl;
cout << "Presentation grade is: " <<
presentation << endl;
cout << "Final Numeric grade is: " <<
finalNumericGrade << endl;
cout << "Final Letter grade is: " <<
finalLetterGrade << endl << endl;
break;

// Case 2 is a Math Student
case 2:
cout << "Enter the Midterm Grade: " << endl;
cin.getline(response,256);
midterm = atoi(response);
cout << "Enter the Final Examination Grade: " << endl;
cin.getline(response,256);
finalExamGrade = atoi(response);
finalNumericGrade = (MATH_MIDTERM_PERCENTAGE * midterm) +
(MATH_FINALEXAM_PERCENTAGE * finalExamGrade);
if (finalNumericGrade > 90)
finalLetterGrade = 'A';
else
if ((finalNumericGrade >= 83) &
(finalNumericGrade < 90))
finalLetterGrade = 'B';
else
if ((finalNumericGrade >= 76) &
(finalNumericGrade < 83))
finalLetterGrade = 'C';
else
if ((finalNumericGrade >= 65) &
(finalNumericGrade > 76))
finalLetterGrade = 'D';
else
if (finalNumericGrade < 65)
finalLetterGrade = 'F';

cout << endl << "***MATH STUDENT***" << endl;
cout << "Midterm grade is: " <<
midterm << endl;
cout << "Final Exam grade is: " <<
finalExamGrade << endl;
cout << "Final Numeric grade is: " <<
finalNumericGrade << endl;
cout << "Final Letter grade is: " <<
finalLetterGrade;
break;

// Case 3 is a Science Student
case 3:
cout << "Enter the Midterm Grade: ";
cin.getline(response,256);
midterm = atoi(response);
cout << "Enter the Final Examination Grade: ";
cin.getline(response,256);
finalExamGrade = atoi(response);
cout << "Enter the Research Grade: ";
cin.getline(response,256);
research = atoi(response);
finalNumericGrade = (midterm * SCIENCE_MIDTERM_PERCENTAGE) +
(finalExamGrade * SCIENCE_FINALEXAM_PERCENTAGE) +
(research * SCIENCE_RESEARCH_PERCENTAGE);
if (finalNumericGrade >= 90)
finalLetterGrade = 'A';
else
if ((finalNumericGrade >=80) &
(finalNumericGrade < 90))
finalLetterGrade = 'B';
else
if ((finalNumericGrade >= 70) &
(finalNumericGrade < 80))
finalLetterGrade = 'C';
else
if ((finalNumericGrade >= 60) &
(finalNumericGrade < 70))
finalLetterGrade = 'D';
else
if (finalNumericGrade < 60)
finalLetterGrade = 'F';
cout << endl << "***SCIENCE STUDENT***" << endl;
cout << "Midterm grade is: "
<< midterm << endl;
cout << "Final Exam grade is: "
<< finalExamGrade << endl;
cout << "Research grade is: "
<< research << endl;
cout << "Final Numeric grade is: "
<< finalNumericGrade << endl;
cout << "Final Letter grade is: "
<< finalLetterGrade << endl;
break;
default:
cout << response <<
" - is not a valid student type";
return 1;
} // end of switch

cout << endl <<
"Do you have another grade to calculate? ";
cin >> moreGradesToCalculate;
for (int i = 0;
i < moreGradesToCalculate.length(); i++) {
moreGradesToCalculate[i] =
toupper (moreGradesToCalculate[i]);
} // end of for
} // end of while
cout << endl <<
"Thanks for using the Grades Calculation program!" << endl;

return 0;
} // end of main



I appreciate all those who have helped me. All others, I'm disappointed.

I normally don't help with homework stuff, but the problem you have is something that drove me nuts many years ago. You're dealing with a problem where some user input is left in the input buffer, and it gets mis-interpreted. Long story short, I would suggest trying to figure out a way to use cin.getline() for reading in the yes/no response from the user.

Also, in your if-statements. You're not using the right AND and OR operators. What you have in the code you posted are binary operators, not logical operators. Trust me, you want to use && and || instead. No really, trust me. What you have might work for this program, but it is a very bad habit you should avoid.

Edit:
Also, to help others help you, always, always, always use code tags around code you post.

Okay, thanks for the reply. Tomorrow I'll work on that and see if it works. Thanks