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Online OpenGL tutor in the USA

Texas, USA

Rachael W


Bachelors in Computer Science, Massachusetts Institute of Technology, USA

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Online OpenGL tutor in the USA

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Programming students get a lot of challenges with OpenGL assignments. Most of the students tell me that they were afraid of OpenGL before they even started it. They say that they hear from other students ahead of them that OpenGL is very challenging. However, I am here to make things better and simpler for all programming students. I am an Online OpenGL tutor based in the USA. I have been offering OpenGL classes and completing assignments for the last 5 years. During this period I have helped many students understand OpenGL better. If you are looking for a qualified OpenGL tutor reach out to me and I will help in anything relating to OpenGL.

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C++ fundamentals

#include #include using namespace std; // Entry point of the program int main() { // Get the student's name cout<< "Welcome to the Fall 2020-2021 Semester grading system. What is your name? "; string name; cin>> name; // Get the student's course cout<< "Hello " << name << "! Please enter the name of the course to be processed: "; string course; cin>> course; // Ask if it's first time cout<< "Hello " << name << "! If you take the " << course << " for the first time, enter YES otherwise NO: "; string isFirstTime; cin>>isFirstTime; // Accept only a YES or NO answe if (isFirstTime != "YES" &&isFirstTime != "NO") return 0; string grade; if (isFirstTime == "YES") { // Ask for a letter grade cout<< "What is your grade from (A,B,C,D,F)? "; cin>> grade; // Stop if the grade is invalid if (grade != "A" && grade != "B" && grade != "C" && grade != "D" && grade != "F") { cout<< "Invalid grade selection. Goodbye..." <<="" p="" style="box-sizing: border-box; margin: 0px; padding: 0px;"> return 0; } // Ask for grade switch if grade is A to D and want to go S if (grade == "A" || grade == "B" || grade == "C" || grade == "D") { cout<< "Do you want to switch your grade from " << grade << " to S (YES or NO)? "; string switchGrade; cin>>switchGrade; if (switchGrade != "YES" &&switchGrade != "NO") { cout<< "Invalid grade selection. Goodbye..." <<="" p="" style="box-sizing: border-box; margin: 0px; padding: 0px;"> return 0; } if (switchGrade == "YES") // Switch grade if needed grade = "S"; } // Ask for a grade switch for grade is F and want to go U else if (grade == "F") { cout<< "Do you want to switch your grade from " << grade << " to U (YES or NO)? "; string switchGrade; cin>>switchGrade; if (switchGrade != "YES" &&switchGrade != "NO") { cout<< "Invalid grade selection. Goodbye..." <<="" p="" style="box-sizing: border-box; margin: 0px; padding: 0px;"> return 0; } if (switchGrade == "YES") // Switch grade if needed grade = "U"; } } else if (isFirstTime == "NO") { // Ask for previous letter grade cout<< "Please enter your previous grade from (A,B,C,D,F,S,U): "; string previousGrade; cin>>previousGrade; // Stop if the grade is invalid if (previousGrade != "A" &&previousGrade != "B" &&previousGrade != "C" &&previousGrade != "D" &&previousGrade != "F" &&previousGrade != "S" &&previousGrade != "U") { cout<< "Invalid grade selection. Goodbye..." <<="" p="" style="box-sizing: border-box; margin: 0px; padding: 0px;"> return 0; } // Ask for current grade cout<< "Please enter your current grade from (A,B,C,D,F): "; string currentGrade; cin>>currentGrade; // Stop if the grade is invalid if (currentGrade != "A" &¤tGrade != "B" &¤tGrade != "C" &¤tGrade != "D" &¤tGrade != "F") { cout<< "Invalid grade selection. Goodbye..." <<="" p="" style="box-sizing: border-box; margin: 0px; padding: 0px;"> return 0; } // Choose a new grade cout<< "Please enter the grade you want to choose from (A,B,C,D,F,S,U): "; string newGrade; cin>>newGrade; // If a student has received "U" the previous semester and got one of (A, B, C, D) in // the current semester if (previousGrade == "U" && (currentGrade == "A" || currentGrade == "B" || currentGrade == "C" || currentGrade == "D")) { // students cannot choose other than "S" or current letter // grade. if (newGrade != "S" &&newGrade != currentGrade) { cout<< "Invalid grade selection. If you received U before, you may choose S or current letter grade." <<="" p="" style="box-sizing: border-box; margin: 0px; padding: 0px;"> return 0; } } // If a student has received an "S" previous semester and, got an "F" current semester else if (previousGrade == "S" &¤tGrade == "F") { // Only F is acceptable if (newGrade != "F") { cout<< "Invalid grade selection. If you received S before and fail this semester, you get F." <<="" p="" style="box-sizing: border-box; margin: 0px; padding: 0px;"> return 0; } } // If a student has received an "F" previous semester and, got an "F" current semester else if (previousGrade == "F" &¤tGrade == "F") { // Only F is acceptable if (newGrade != "F") { cout<< "Invalid grade selection. If you received F before, and fail this semester, you get F." <<="" p="" style="box-sizing: border-box; margin: 0px; padding: 0px;"> return 0; } } // The student cannot choose a higher or lower grade than the letter grade he / she has received else if ((currentGrade == "A" || currentGrade == "B" || currentGrade == "C" || currentGrade == "D") &&newGrade != currentGrade) { if (newGrade != "S") { cout<< "Invalid grade selection. You cannot choose a higher or lower grade than you deserve." <<="" p="" style="box-sizing: border-box; margin: 0px; padding: 0px;"> return 0; } } grade = newGrade; } // Report final grade cout<< name << ", your final grade for " << course << " is " << grade << ". Goodbye..." <<="" p="" style="box-sizing: border-box; margin: 0px; padding: 0px;"> return 0; }

Floating Point Numbers Decoding

/*! \file prog1.cpp \brief Assignment 1 program The program asks for input from the user and displays the read number as a IEEE-754 floating point number in binary form. */ #include #include #include /*! \fn void printBinFloat(int32_t x) \brief Prints the given number as a IEEE-754 floating point number \param num Number to be printed. The function prints the number in hexadecimal, in binary and then prints the IEEE-754 field values. After that, it prints the decoded floating point number in binary. */ void printBinFloat(int32_t num) { // print hexadecimal number std::cout << "0x" << std::hex << std::setw(8) << std::setfill('0') << num << " = "; // print binary number int tmpnum = num; for (int i = 0; i < 8; i++) // print 8 nibbles { for (int i = 0; i < 4; i++) // print 4 bits { std::cout << (tmpnum & 0x80000000 ? '1':'0'); tmpnum <<= 1; } std::cout << " "; } std::cout << std::endl; int sign = (num & 0x80000000) ? 1 : 0; // get the sign bit (31) int exp = (num >> 23) & 0xFF; // get the 8 exponent bits from 23 to 30 exp -= 127; // remove bias uint32_t sig = num & 0x7FFFFF; // get the 23 bits of significand // print floating point fields std::cout << "sign: " << sign << std::endl; std::cout << " exp: 0x" << std::hex << std::setw(8) << std::setfill('0') << exp << " (" << std::dec << exp << ")" << std::endl; std::cout << " sig: 0x" << std::hex << std::setw(8) << std::setfill('0') << sig << std::endl; // print floating point number std::cout << ((sign)? '-' : '+'); // print sign if (exp == 128 && sig == 0) // infinite { std::cout << "inf"; } else if (exp == -127 && sig == 0) // zero { std::cout << "0"; } else // floating point value { // add 1 to significand sig |= 0x800000; // print initial zeros if negative exponent for (int j = exp; j <= -1; j++) { std::cout << "0"; if (j == exp) std::cout << "."; } // print 24 bits of significand for (int i = 0; i < 24; i++) { std::cout << (sig & 0x800000 ? '1':'0'); if (i == exp) std::cout << "."; sig <<= 1; } // print end zeros if positive exponent for (int j = 23; j <= exp; j++) { std::cout << "0"; if (j + 1 == exp) std::cout << "."; } } std::cout << std::endl; } /*! \fn int main() \brief Main function The main function for the program prompts user for a number and prints it using the printBinFloat function. It loops until the user decides to end the program. */ int main() { while(true) { uint32_t number; std::cout << "Number? "; std::cin >> std::hex >> number; printBinFloat(number); std::cout << "End program (Y/N)? "; char quit; std::cin >> quit; if (quit == 'Y' || quit == 'y') break; std::cout << std::endl; } return 0; }