Is main function mandatory in glsl shaders?

In C++, how do I output the courseGrade in the main function?

• /* Program Problem: The function printGrade in Example 5-10 is written as a void function to compute and output the course grade. The course grade is passed as a parameter to the function printGrade. Re-Write the function printGrade as a value returning function so that it computes and returns the course grade. (The course grade must be output in the function main.) Also, change the name of the function to calculateGrade. */ The Code: #include <iostream> #include <cstdlib> #include <iomanip> using namespace std; double calculateGrade (double letter); int main() { double courseScore; cout<<"Enter The student Score: "<<endl; cin>> courseScore; cout<<"The Student's Course Grade: "<<setprecision(1)<<fixed<<courseScore<<... if (calculateGrade(courseScore)){ cout<<"Letter Grade: "<<endl; } system("pause"); return 0; } double calculateGrade (double letter) { if (letter>=90) { cout<<" A"<<endl; return true; } else if (letter>=80){ cout<<"B"<<endl; return true; } else if (letter>=70){ cout<<"C"<<endl; return true; } else if (letter>=60){ cout<<"D"<<endl; return true; } { cout<<"F"<<endl; return true; } } ------------------------------ The code is working fine but the only issue that I am having is the output Here when I get: When I input 70 Output: The Student Score is 70.0 C Letter Grade: _____________ I am trying to get it output like this: The Student Grade: 70.0 Letter Grade: C How can i fix it this way?

• Answer:

  Comments: Your program outputs inside the function calculateGrade(), not in main(), so it does not satisfy the requirements by your instructor. Your calulateGrade() also does not return the letter grade either, as per the program requirements. Try this instead: #include <iostream> #include <cstdlib> #include <iomanip> using namespace std; double calculateGrade (double letter); int main() { double courseScore; cout<<"Enter The student Score: "<<endl; cin>> courseScore; cout<<"The Student's Course Grade: "<<setprecision(1)<<fixed<<courseScore<<... /* --------------------output result of calculateGrade()------------------------... */ cout<<"Letter Grade: "<<calculateGrade(courseScore)<<endl; system("pause"); return 0; } char calculateGrade (double letter) /* ---------------------------------------... calculateGrade() takes a parameter, letter, of type double and returns a result of type char. ----------------------------------------... */ { if (letter>=90) return "A"; /* ---note: return terminates execution inside the function, so nested if- else if's are unecessary as if condition is satisfied, program flow will never reach other if statements. ---*/ if (letter>=80) return "B"; if (letter>=70) return "C"; if (letter>=60) return "D"; return "F"; }