Thread: compile problem

I have a problem compiling this program.Any suggestions is due tomorow.THANKS

Code:

#include <iostream.h>
#define	MEAN = 65.4f
#define	STD_DEV = 15.6f

int main(void)
{
	float std_score;
	int score;
    char grade;

	cout <<"Enter the score of a student or enter -1 to stop: \n";
	cin >> score;

	while (score != -1)  
	{
        std_score = (score - MEAN) / STD_DEV;

        if (std_score >= 1)
			grade = ‘A’;
        else if (std_score >= 0)
			grade = ‘B’;
		else if (std_score >= -1)
			grade = ‘C’;
		else if (std_score >= -2)
			grade = ‘D’;
		else
			grade = ‘F’;

		cout << "Grade = " << grade endl;
		cout << " Enter the next score or enter -1 to stop ";
		cin >> score;
}
	return 0;
}

Cpp(17) : error C2059: syntax error : '='
Cpp(20) : error C2018: unknown character '0x91'
Cpp(20) : error C2018: unknown character '0x92'
Cpp(20) : error C2065: 'A' : undeclared identifierCpp(22) : error C2018: unknown character '0x91'
Cpp(22) : error C2018: unknown character '0x92'
Cpp(22) : error C2065: 'B' : undeclared identifier
Cpp(24) : error C2018: unknown character '0x91'
Cpp(24) : error C2018: unknown character '0x92'
Cpp(24) : error C2065: 'C' : undeclared identifier
Cpp(26) : error C2018: unknown character '0x91'
Cpp(26) : error C2018: unknown character '0x92'
Cpp(26) : error C2065: 'D' : undeclared identifier
Cpp(28) : error C2018: unknown character '0x91'
Cpp(28) : error C2018: unknown character '0x92'
Cpp(28) : error C2065: 'F' : undeclared identifier
Cpp(30) : error C2146: syntax error : missing ';' before identifier 'endl'
Cpp(30) : warning C4551: function call missing argument list
Error executing cl.exe.

.exe - 17 error(s), 1 warning(s)