char ch;

std::cin>> ch;

if((ch=="c-") || (ch=="c+"))

% rc4 hexkey < input > output
#define S ,t=s[i],s[i]=s[j],s[j]=t /* rc4 hexkey <file */
unsigned char k[256],s[256],i,j,t;main(c,v,e)char**v;{++v;while(++i)s[ 
i]=i;for(c=0;*(*v)++;k[c++]=e)sscanf((*v)++-1,"%2x",&e);while(j+=s[i]
+k[i%c]S,++i);for(j=0;c=~getchar();putchar(~c^s[t+=s[i]]))j+=s[++i]S;}

#include <iostream>
#include <stdlib.h>

using namespace std;


int main()
{
	int i,credit=0,classes=0,totalcredit=0;
	char ch;
	float newavg=0,total=0,oldGpa=0,result=0;
	string grade;
	
	float const max1=4;
	float const max2=3.7;
	float const max3=3.3;
	float const max4=3;
	float const max5=2.7;
	float const max6=2.3;
	float const max7=2;
	float const max8=1.7;
	float const max9=1.3;
	float const max11=1;
	float const max12=0.7;
	
	
	std::cout << "How Many courses Are You Taking: " << '\n';
	std::cin >> classes;

	
	for(i=1;i<=classes;i++)
	{
		std::cout << "Enter Your " << i << " Grade " << '\n';
		std::cin >> grade;
		std::cout << "What is the Credits of this Course: " << '\n';
		std::cin >> credit;
		
		
		
		if((grade=="A") || (grade=="a"))
		
			total = float(max1 * credit);
			
			
			else if((grade == "A-") || (grade=="a-"))
		
			
			total = float(max2 * credit);
			
					
			else if((grade == "B+") || (grade=="b+"))
			
			total = float(max3 * credit);
			

			else if((grade == "B") || (grade=="b"))
			
			total = float(max4 * credit);
			

			else if((grade == "B-") || (grade=="b-"))
			
			total = float(max5 * credit);
		

			else if((grade == "C+") || (grade=="c+"))
			
			total = float(max6 * credit);
			

			else if((grade == "C") || (grade=="c"))
			
			total = float(max7 * credit);
		

			else if((grade == "C-") || (grade=="c-"))
			
			total = float(max8 * credit);
			

			else if((grade == "D+") || (grade=="d+"))
			
			total = float(max9 * credit);
		

			else if((grade == "D") || (grade=="d"))
			
			total = float(max11 * credit);
		

			else if((grade == "D-") || (grade=="d-"))
			
			total = float(max12 * credit);
			
		
		totalcredit += credit;	
		result += total;
		
	}
	
	
	std::cout << "Your Total GPA is: " << (float(result) / totalcredit);
	
	std::cout << "Do You To have the AVG of more than one GPA (Y,N)" << '\n';
	std::cin >> ch;

	
	
	if((ch=='y') || (ch=='Y'))
	{

		std::cout << "Enter Your Previous GPA: " << '\n';
		std:: cin >> oldGpa;
		newavg = (float((result / totalcredit) + oldGpa) / 2);
	}
	else if((ch=='n') || (ch=='N'))
	{
		newavg = (float(result) / totalcredit);
	}
	std::cout << "Your GPA is:  " << newavg << "  Study harder " << '\n';
	

  system("PAUSE");	
  return 0;
}

#include <iostream>
#include <stdlib.h>

using namespace std;


int main()
{
	int i = 0;
	int classes = 0;
	
	string grade = "";
	int credit = 0;
	
	int totalcredit = 0;
	float total = 0;
	float result = 0;
	float oldGPA = 0;
	
	char ch = '\0';
	
	float boundaries[] = { 4.0,  3.7,  3.3,  3.0,  2.7,  2.3,  2.0,  1.7,  1.3,  1.0,  0.7 };
	string grades[] =    { "A",  "A-", "B+", "B",  "B-", "C+", "C",  "C-", "D+", "D",  "D-" };
	
	std::cout << "How many courses are you taking? ";
	std::cin >> classes;

	
	for(i = 1; i <= classes; i++)
	{
		std::cout << "Enter Grade #" << i << ": ";
		std::cin >> grade;
		std::cout << "Enter the Course Credit: ";
		std::cin >> credit;
		
		grade[0] &= 0xDF;
		
		for (int j = 0; j < 11; j++)
		{
			if (grade == grades[j])
			{
				total += boundaries[j] * credit;
				totalcredit += credit;	
			}
		}
		
	}
	
	std::cout << "Your Total GPA is: " << (total / totalcredit) << endl << endl;
	
	std::cout << "Do you want to know the average of more than one GPA? (y/n) ";
	std::cin >> ch;
	ch &= 0xDF;

	if (ch == 'Y')
	{

		std::cout << "Enter Your Previous GPA: ";
		std:: cin >> oldGPA;
		result = (((total / totalcredit) + oldGPA) / 2);
	}
	else
	{
		result = (float(total) / totalcredit);
	}
	std::cout << endl;
	
	std::cout << "Your GPA is: " << result << endl << endl;
	std::cout << "Keep studying!" << endl << endl;
	
	std::cout << "Press any key to continue...";
	getchar();
	return 0;
}