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Error I can't figure out!

lkegley (12)
We are doing a project for my programming class and the assignment is to have a program that calculates GPA by semester. I have the calculations just fine but I can't get the Semesters to work. I'm not very good at c++, so I would appreciate your help! Below are the errors the compiling gives me:

hw2.cpp: In function âint main()â:
hw2.cpp:31: error: could not convert âSemNameâ to âboolâ
hw2.cpp:87: error: could not convert âSemName.std::basic_string<_CharT, _Traits, _Alloc>::operator= [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>](-0x00000000000000001)â to âboolâ

Thank you!!!

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#include <iostream>
#include <string>
using namespace std;

int main ()
{

cout << endl <<  "Please enter all the grades you wish to use for your GPA." << endl;

cout << endl <<  "When you have finished, enter N to indicate that you have no more grades." << endl;

cout << endl << "The highest acceptable grade is 100%, if you got higher than this congratulations but please enter only 100 as grade."  << endl;

cout << endl;

float Grade = 0;
int NumClass = 0;
const int Stop = -1;
float GPAVal = 0;
float TotGPAVal = 0;
float GPA = 0;
std :: string SemName;

while (SemName)
        {
        cout << "Please enter name of the semester of grades you want to enter." << endl;
        cin >> SemName;
        cout << SemName << endl;


        while ( Grade >= 0 && Grade <= 100 )
                {
                cout << endl << "Please enter grade: ";
                cin >> Grade;
                        if  ( Grade <=100 && Grade >= 90 )
                                {
                                GPAVal = 4.0;
                                cout << "Grade: " << Grade << "%; GPA Value: 4.0" << endl;
                                TotGPAVal = TotGPAVal + GPAVal;
                                }
                        else if ( Grade < 90 && Grade >= 80 )
                               {
                                GPAVal = 3.0;
                                cout << "Grade: " << Grade << "%; GPA Value: 3.0" << endl;
                                TotGPAVal = TotGPAVal + GPAVal;
                                }
                        else if ( Grade < 80 && Grade >= 70 )
                                {
                                GPAVal = 2.0;
                                cout << "Grade: " << Grade << "%; GPA Value: 2.0" << endl;
                                TotGPAVal = TotGPAVal + GPAVal;
                                }
                        else if ( Grade < 70 && Grade >= 60 )
                                {
                                GPAVal = 1.0;
                                cout << "Grade: " << Grade << "%; GPA Value: 1.0" << endl;
                                TotGPAVal = TotGPAVal + GPAVal;
                                }
                        else if ( Grade < 60 && Grade >= 0 )
                                {
                                GPAVal = 0.0;
                                cout << "Grade: " << Grade << "%; GPA Value: 0.0" << endl;
                                TotGPAVal = TotGPAVal + GPAVal;
                                }
                        else if ( Grade = Stop )
                                {
                                GPA = (TotGPAVal / NumClass);
                                cout << endl<< "Your overall GPA, after " << NumClass << " courses, is " << GPA << "." << endl << endl;
                                }
                        else if ( Grade > 100 || Grade < -1 )
                                {
                                cout << "Sorry this is an invalid input, please rerun the program and try again." << endl;
                                }
                        else
                                {
                                cout << "Sorry this is an invalid input, please rerun the program and try again." << endl;
                                }
                NumClass = NumClass + 1;
                }
        if (SemName = -1)
                {
                cout << "Thank you for using this program!" << endl;
                }
        }


return (0);
}

firedraco (6243)
while(SemName) does not make sense because an std::string can't be converted to a bool (i.e., can't be converted to true or false).
arcadiu (82)
As firedraco said it doesn't make sense and your also trying to convert a string into an integer.
if (SemName = -1)
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