1. Which of the following are illegal C++ identifiers. Justify your answer.
 
   a) weight
   b) 34
   c) 8Z
   d) L1
   e) min.value

2. Identify the C++ keywords.
 
   a) else
   b) while
   c) int_rate
   d) int

3. Examine the following syntactically valid program. Identify potential
   problems.

   #include <iostream.h>
   int main()
   {
      int z;
      int y;
      cin >> y;
      z = z + y;
      cout << endl << z; 
      return 0;
   }

4. Convert the following into C++ expressions.

   a) 1 / z(x + y)
   b) xy + xz - 3
   c) x + y/2
   d) (x + y)/ 2
   e) (a + b)c

5. Examine the following C++ code fragments. Identify and correct
   potential problems.

   a) if (x == 3);
         x++;
      else
         x=x + 3;

   b) if (x == 3)
         x=x + 3;
      else;
         x++;

   c) if (x == 3)
         x=x + 3
      else
         x++;
 
   d) int x=1,
      while (x < 10);
         tot = tot + x;
         x++;

6. Evaluate the following C++ expressions. Assume a and b have been 
   intialized and have been set to 20 and 9 respectively.

   a) a%b
   b) a/b*b
   c) (a*b)/b
   d) (a/b)*b 

7. Examine the following. Comment on potential problems and suggest
   an appropriate fix.

   a) int x = 2.56;
   b) double x = 3/2;
   c) double x, y;
      y = (3/2) * x + 2.1;
   d) double x, y;
      y = double(3/2) * x + 2.1;

8. Consider the following function definition. Write the code fragment
   (say for your main program) that could be used to invoke this function.

   int testfunc (int a, int b)
   {
   return a + b;
   } 
  
9. Convert the following switch statement to a nested if structure.

   int sum=0; 
   switch(x)
   {
   case 1:
      sum = sum + 1;
      cout << "Add one \n";
      break;
   case 2:
      sum = sum + 2;
      cout << "Add two \n";
      break;
   case 3:
      sum = sum + 3;
      cout << "Add three \n";
      break;
   default:
      cout << "Ouch \n";
      break;
   }

10. Examine the following code and determine the output.

   a) int i=1;
      while (i<=10)
      {
         if (i<5 && i != 2)
            cout << "X";
            i++;
      }

   b) int i;
      for (i=1; i<=10; i=i+3)
        cout << "X";

11. Rewrite the following as a for loop.

    a) int i=1;
       while (i<=5)
       {
          cout << "loop\n";   
          i=i+2;
       }

    b) int j=10;
       while (j>0)
       {
          cout << "loop\n";
          j--;
       }