Question

in C++ use loopDW.cpp below

Do While Loop Exercise

• Get a copy of the loopDW.cpp.
• Add a do-while loop to complete the program.
  The do-while loop will make sure that
  a valid mark will be obtained before further process.
  (hint: a event-controlled do-while loop is needed.)
• Compile and run the program.
  Use input values: -10, 30, 59, 70, 75, 96, and 108.
• Show the output to your lab instructor.

#include <iostream>
using namespace std;

int main()
{
   int mark;
   char grade;

   cout << "Please enter an integer mark: "  << endl;

   // Please add a do-while loop below to make sure a valid mark 
   // between [0, 100] is entered. 




   if (mark >= 85)
   {
      grade = 'A';
      cout << "Great Mark. " << endl;
   }
   else if (mark >= 75 && mark < 85) 
   {
      grade = 'B';
      cout << "Good Mark. " << endl;
   }
   else if (mark >= 65 && mark < 75) 
   {
      grade = 'C';
      cout << "Average Mark. " << endl;
   }
   else if (mark >= 50 && mark < 65) 
   {
      grade = 'D';
      cout << "You passed the class. " << endl;
   }
   else 
   { 
      grade = 'F';
      cout << "You failed the class. " << endl;
   }

   cout << "The corresponding character grade is " << grade << endl;

   return 0;
}
// end program

Answer 1

Code:

#include <iostream>
using namespace std;

int main()
{
   int mark;
   char grade;

   cout << "Please enter an integer mark: " << endl;
  
   do{
       //taking input from user
       cin>>mark;
       //if mark is greaterthan 100 or lessthan 0
       //then print the message
       if(mark>100 || mark<0){
           cout<<"Invalid input, marks [1 -100]"<<endl;
       }
   //this loop iterates until user enters valid marks
   }while(mark>100 || mark<0);

   if (mark >= 85)
   {
      grade = 'A';
      cout << "Great Mark. " << endl;
   }
   else if (mark >= 75 && mark < 85)
   {
      grade = 'B';
      cout << "Good Mark. " << endl;
   }
   else if (mark >= 65 && mark < 75)
   {
      grade = 'C';
      cout << "Average Mark. " << endl;
   }
   else if (mark >= 50 && mark < 65)
   {
      grade = 'D';
      cout << "You passed the class. " << endl;
   }
   else
   {
      grade = 'F';
      cout << "You failed the class. " << endl;
   }

   cout << "The corresponding character grade is " << grade << endl;

   return 0;
}
// end program

Output:

Code Screenshot:

Code Snippet:

#include <iostream>
using namespace std;

int main()
{
   int mark;
   char grade;

   cout << "Please enter an integer mark: "  << endl;
        
        do{
                //taking input from user
                cin>>mark;
                //if mark is greaterthan 100 or lessthan 0
                //then print the message 
                if(mark>100 || mark<0){
                        cout<<"Invalid input, marks [1 -100]"<<endl;
                }
        //this loop iterates until user enters valid marks
        }while(mark>100 || mark<0);




   if (mark >= 85)
   {
      grade = 'A';
      cout << "Great Mark. " << endl;
   }
   else if (mark >= 75 && mark < 85) 
   {
      grade = 'B';
      cout << "Good Mark. " << endl;
   }
   else if (mark >= 65 && mark < 75) 
   {
      grade = 'C';
      cout << "Average Mark. " << endl;
   }
   else if (mark >= 50 && mark < 65) 
   {
      grade = 'D';
      cout << "You passed the class. " << endl;
   }
   else 
   { 
      grade = 'F';
      cout << "You failed the class. " << endl;
   }

   cout << "The corresponding character grade is " << grade << endl;

   return 0;
}
// end program