CSC 215

Fall '98 Section 701

Midterm solutions

Listed below are solutions to the midterm.

1.  
    double getFactor() 
    { 
      double answer; 
      do { 
        cout << "Please enter the factor: "; 
        cin >> answer; 
      } while (answer <= 0.5 || answer >= 1); 
      return answer; 
    }
   
   

2. 
    char getShirtSize()
    {
      char answer;
      do {
        cout << "Please enter a shirt size: ";
        cin >> answer;
        answer = toupper(answer);
      } while (answer != 'S' && answer != 'M' && answer != 'L');
      return answer;
    }
   

3. 
    double hypotenuse(double a, double b)
    {
      if (a < 0 || b < 0) {
        return 0;
      }
      else {
        return sqrt(a*a + b*b);
      }
    }
   

4. 
    double donutVolume(double r_donut, double r_hole)
    {
      const double pi = 3.14159;
      return 2* pi*pi * r_donut*r_donut * (r_hole + r_donut);
    }
     
   

5. 
    long sumseries(int m, int n)
    {
      int index;
      long answer = 0;
      for (index = m; index <= n; index++) {
        answer += index*index + 3*index;
      }
      return answer;
    }
   

6. 16
   8
   4
   2
   4, 1
   

7. 
    1, 1
    2, 5
    3, 14
    4, 30