C++ Code:
# include <iostream>
# include <iomanip>
using namespace std;
char subGrades[6][3];
void calGPA(char subGrades[][3])
{
double gradePoints = 0;
double gpa;
for (int i = 0; i < 6; i++)
{
if (i!=1)
{
if (strcmp(subGrades[i], "A") == 0)
{
gradePoints = gradePoints + (3.0*4.0);
}
else if (strcmp(subGrades[i], "A-") == 0)
{
gradePoints = gradePoints + (3.0*3.7);

}
else if (strcmp(subGrades[i], "B+") == 0)
{
gradePoints = gradePoints + (3.0*3.3);

}
else if (strcmp(subGrades[i], "B") == 0)
{
gradePoints = gradePoints + (3.0*3.0);

}
else if (strcmp(subGrades[i], "B-") == 0)
{
gradePoints = gradePoints + (3.0*2.7);

}
else if (strcmp(subGrades[i], "C+") == 0)
{
gradePoints = gradePoints + (3.0*2.3);

}
else if (strcmp(subGrades[i], "C") == 0)
{
gradePoints = gradePoints + (3.0*2.0);

}
else if (strcmp(subGrades[i], "C-") == 0)
{
gradePoints = gradePoints + (3.0*1.7);

}
else if (strcmp(subGrades[i], "D") == 0)
{
gradePoints = gradePoints + (3.0*1.0);

}
else if (strcmp(subGrades[i], "F") == 0)
{
gradePoints = gradePoints + (3.0*0.0);

}
}
if (i==1)
{
if (strcmp(subGrades[i], "A") == 0)
{
gradePoints = gradePoints + (1.0*4.0);

}
else if (strcmp(subGrades[i], "A-") == 0)
{
gradePoints = gradePoints + (1.0*3.7);


}
else if (strcmp(subGrades[i], "B+") == 0)
{
gradePoints = gradePoints + (1.0*3.3);

}
else if (strcmp(subGrades[i], "B") == 0)
{
gradePoints = gradePoints + (1.0*3.0);

}
else if (strcmp(subGrades[i], "B-") == 0)
{
gradePoints = gradePoints + (1.0*2.7);

}
else if (strcmp(subGrades[i], "C+") == 0)
{
gradePoints = gradePoints + (1.0*2.3);

}
else if (strcmp(subGrades[i], "C") == 0)
{
gradePoints = gradePoints + (1.0*2.0);

}
else if (strcmp(subGrades[i], "C-") == 0)
{
gradePoints = gradePoints + (1.0*1.7);

}
else if (strcmp(subGrades[i], "D") == 0)
{
gradePoints = gradePoints + (1.0*1.0);

}
else if (strcmp(subGrades[i], "F") == 0)
{
gradePoints = gradePoints + (1.0*0.0);

}
}

}
cout << setprecision(3) << showpoint << endl;
gpa = gradePoints / 16.00;
cout << "Your GPA in 1st Semester is : " << gpa << endl;
}
void calGradePoint(double subNumbers[])
{
for (int i = 0; i < 6; i++)
{
if (subNumbers[i] >= 80 && subNumbers[i] <= 100)
{
subGrades[i][0] = 'A';
if (subNumbers[i] >= 80 && subNumbers[i]<85)
{
subGrades[i][1] = '-';
subGrades[i][2] = '\0';
}
else
{
subGrades[i][1] = '\0';
subGrades[i][2] = '\0';
}

}
else if (subNumbers[i] >= 65)
{
subGrades[i][0] = 'B';
if (subNumbers[i] >= 75)
{
subGrades[i][1] = '+';
subGrades[i][2] = '\0';
}
else if (subNumbers[i] >= 70)
{
subGrades[i][1] = '\0';
subGrades[i][2] = '\0';
}
else
{
subGrades[i][1] = '-';
subGrades[i][2] = '\0';
}
}
else if (subNumbers[i] >= 55)
{
subGrades[i][0] = 'C';
if (subNumbers[i] >= 61)
{
subGrades[i][1] = '+';
subGrades[i][2] = '\0';
}
else if (subNumbers[i] >= 58)
{
subGrades[i][1] = '\0';
subGrades[i][2] = '\0';
}
else
{
subGrades[i][1] = '-';
subGrades[i][2] = '\0';
}
}
else if (subNumbers[i] >= 50)
{
subGrades[i][0] = 'D';
subGrades[i][1] = '\0';
subGrades[i][2] = '\0';
}
else
{
subGrades[i][0] = 'F';
subGrades[i][1] = '\0';
subGrades[i][2] = '\0';
}
}
calGPA(subGrades);
}
int main()
{
int choice;
double subNumbers[6];
cout << "Welcome to Your GPA Calculator in 1st Semester" << endl;
cout << endl;
cout << "Please select the way you want to proceed : " << endl;
cout << "Enter '1' to calculate GPA by Grades (A-F)" << endl;
cout << "Enter '2' to calculate GPA by Numbers in each Subject" << endl;
cin >> choice;
while (choice<1 ||choice>2)
{
cout << "Wrong choice" << endl;
cout << "Enter '1' to calculate GPA by Grades (A-F)" << endl;
cout << "Enter '2' to calculate GPA by Numbers in each Subject" << endl;
cin >> choice;
}
cin.ignore();
if (choice == 1)
{
cout << "Please follow the Following table to enter your Grade : " << endl;
cout << "Enter 'A' for 85 marks or above" << endl;
cout << "Enter 'A-' for (80-84) marks" << endl;
cout << "Enter 'B+' for (75-79) marks" << endl;
cout << "Enter 'B' for (70-74) marks" << endl;
cout << "Enter 'B-' for (65-69) marks" << endl;
cout << "Enter 'C+' for (61-64) marks" << endl;
cout << "Enter 'C' for (58-60) marks" << endl;
cout << "Enter 'C-' for (55-57) marks" << endl;
cout << "Enter 'D' for (50-54) marks" << endl;
cout << "Enter 'F' for 50 below marks" << endl;
cout << endl;
cout << "Please enter the grade of Programming Fundamentals : ";
cin.getline(subGrades[0], 3);
cout << "Please enter the grade of Programming Fundamentals Lab : ";
cin.getline(subGrades[1], 3);
cout << "Please enter the grade of Introduction to Computing : ";
cin.getline(subGrades[2], 3);
cout << "Please enter the grade of Calculus-I : ";
cin.getline(subGrades[3], 3);
cout << "Please enter the grade of ElectroMagnetic Theory : ";
cin.getline(subGrades[4], 3);
cout << "Please enter the grade of Islamiat+Pak.Studies : ";
cin.getline(subGrades[5], 3);

calGPA(subGrades);
}
else
{
cout << "Please enter numbers of Programming Fundamentals : ";
cin >> subNumbers[0];
cout << "Please enter numbers of Programming Fundamentals Lab : ";
cin >> subNumbers[1];
cout << "Please enter numbers of Introduction to Computing : ";
cin >> subNumbers[2];
cout << "Please enter numbers of Calculus-I : ";
cin >> subNumbers[3];
cout << "Please enter numbers of ElectroMagnetic Theory : ";
cin >> subNumbers[4];
cout << "Please enter numbers of Islamiat+Pak.Studies : ";
cin >> subNumbers[5];

calGradePoint(subNumbers);

}

getchar();
system("pause");
}

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Problem:
Divide two Binary Numbers
Solution:
#include <iostream>
using namespace std;
long diff( long a,long b);

int main ()
{
long long int num1,num2,temp=0,quotient=0;
int i=0;
//taking input
do
{
cout<<"Enter Dividend in Binary =";
cin>>num1;
cout<<"Enter Divisor in Binary=";
cin>>num2;
if (num1<num2)
cout<<"Invalid Input! Kindly input correct values\n"<<endl;
} while (num1<num2);

int num[50];

while (num1!=0)
{
num[i]=num1%10;
num1/=10;
i++;
}
--i;


while(i>=0)
{
temp=(temp*10)+num[i];
while (temp<num2 && i>=0 )
{
quotient*=10;
i--;
if (i<0)
break;
temp=temp*10+num[i];
}

if (i>=0)
{
quotient=(quotient*10)+1;
temp=diff(temp,num2);
i--;
}
}

cout<<endl<<endl<<"Quotient = "<<quotient<<"\nRemainder = "<<temp<<endl ;
return 0;
}
long diff( long a,long b)

{
long int num1[50],i=0,num2[50];
while (a||b)
{
num1[i]=a%10;
num2[i++]=(b%10);
a=a/10;
b=b/10;
}
i--;

long int diff[50],j,temp;

//calculating Difference

for(temp=0;temp<=i;temp++)
{

if (num1[temp]-num2[temp]>=0)
diff[temp]=num1[temp]-num2[temp];
else
{
j=temp;
j++;
while(num1[j]!=1)
num1[j++]=1;
num1[j]=0;
diff[temp]=1;

}

}

long int ans=0;
while (i>=0)
ans=(ans*10)+diff[i--];

return ans;

}

Problem:
Add, Subtract, Multiply and Division of two Binary Numbers 
Solution:
# include <iostream>
# include <cmath>
using namespace std;
int toDec(int binary)
{
int x = 0, a = 0, y = 0;
while (binary != 0)
{
x = binary % 10;
binary = binary / 10;
y = x*pow(2, a) + y;
a++;
}
return y;

}
int powCheck(int x)
{
for (int v = 0; v<1000; v++)
{
if (pow(2, v) == x)
{
return v;
}
}
}
int main()
{
int bin1, bin2, revBin = 0, conBin = 0;
char choice;
cout << "Please Enter 1st Binary Number : ";
cin >> bin1;
cout << "Please Enter 2nd Binary Number : ";
cin >> bin2;
cout << "Please Enter an operation to be done from below" << endl;
cout << "Enter '+'sign to Add Binary Numbers" << endl;
cout << "Enter '-'sign to Subtract Binary Numbers" << endl;
cout << "Enter '*'sign to Multiply Binary Numbers" << endl;
cout << "Enter '/'sign to Divide Binary Numbers" << endl;
cin >> choice;
int d1 = toDec(bin1); //bin1 to decimal
int d2 = toDec(bin2);
cout << "Decimal of 1st Binary is : " << d1 << endl;
cout << "Decimal of 2nd Binary is : " << d2 << endl;

int fun;
if (choice == '+')
{
fun = d1 + d2;
}
else if (choice == '-')
{
fun = d1 - d2;
}
else if (choice == '*')
{
fun = d1*d2;
}
else if (choice == '/')
{
fun = d1 / d2;
}
else
{
return 0;
}
int altFun = fun;
while (fun != 0)
{
revBin = revBin * 10 + fun % 2;
fun = fun / 2;

}
while (revBin != 0)
{
conBin = conBin * 10 + revBin % 10;
revBin = revBin / 10;
}
if (altFun % 2 == 0 && powCheck(altFun))
{
conBin = conBin*pow(10, powCheck(altFun));
cout <<"The result from "<<choice<<" is: "<< conBin << endl;

}
else if (altFun % 2 == 0)
{
do
{
conBin = conBin * 10;
} while (altFun != toDec(conBin));
cout <<"The result from "<<choice<<" is: "<< conBin << endl;
}
else
{
cout <<"The result from "<<choice<<" is: "<< conBin << endl;
}




return 0;


}

Problem:
Add two Binary Numbers...
Solution:
# include <iostream>
using namespace std;
int toDec(int binary)
{
int x = 0, a = 0, y = 0;
while (binary != 0)
{
x = binary % 10;
binary = binary / 10;
y = x*pow(2, a) + y;
a++;
}
return y;
}
int main()
{
int x;
int y;
int a[10];
int b[10];
int result[20];
cout << "Please Enter 1st Binary Number : ";
cin >> x;
cout << "Please Enter 2nd Binary Number : ";
cin >> y;
int x1 = toDec(x);
int x2 = toDec(y);
int x3 = x1 + x2;
for (int j = 0; j < 10; j++)
{
a[j] = x % 10;
b[j] = y % 10;
x = x / 10;
y = y / 10;
}

for (int i = 0; i <10; i++)
{
if (a[i] + b[i]  == 0)
{
result[i] = 0;
}
else if (a[i] + b[i]  == 1)
{
result[i] = 1;
}
else if (a[i] + b[i] == 2)
{
result[i] = 0;
a[i + 1]++;
}
else if (a[i] + b[i] == 3)
{
result[i] = 1;
a[i + 1]++;

}
else if (a[i] + b[i]  == 4)
{
result[i] = 0;
a[i + 2]++;
}
}

int addResult = 0;
for (int k= 0; k < 10; k++)
{
addResult = addResult * 10 + result[k];
}
while (toDec(addResult) != x3)
{
addResult = addResult / 10;
}
cout <<"The Sum of 2 Binary Numbers is : "<< addResult << endl;

system("pause");
return 0;

}