cin Worksheet Answers

Assume the following declarations:

     int a, b, c;
     float x, y, z;

For each of the following, tell what value, if any, will be assigned to each of these variables, or explain why an error occurs. Use the given input data:

1. cin >> a >> b >> c
       >> x >> y >> z;

   Input:

   1   2   3
   4 5.5 6.6

   Result:

   a = 1  b = 2  c = 3
   x = 4  y = 5.5  z = 6.6
   

2. cin >> a >> b >> c;
   cin >> x >> y >> z;

   Input:

   1
   2
   3
   4
   
   5.5
   6.6

   Result:

   a = 1  b = 2  c = 3
   x = 4  y = 5.5  z = 6.6
   

3. cin >> a >> x;
   cin >> b >> y;
   cin >> c >> z;

   Input:

   1 2.2
   3 4.4
   5 6.6

   Result:

   a = 1  b = 3  c = 5
   x = 2.2  y = 4.4  z = 6.6
   

4. cin >> a >> b >> c;
   cin >> x >> y >> z;

   Input:

   1 2.2
   3 4.4
   5 6.6

   Result:

   a = 1  b = 2  c, x, y, z unpredictable
   cin reads 2 for b, then .2 for c, which is invalid, so error
   no reads are done for x, y, and z after error on c

5. cin >> a;
   cin >> b >> c;
   cin >> x >> y;
   cin >> z;

   Input:

   1   2   3
   4 5.5 6.6

   Result:

   a = 1  b = 2  c = 3
   x = 4  y = 5.5  z = 6.6
   

6. cin >> a
       >> b >> c
       >> x >> y
       >> z;

   Input:

   1   2   3
   4 5.5 6.6

   Result:

   a = 1  b = 2  c = 3
   x = 4  y = 5.5  z = 6.6
   

7. cin >> a >> b;
   cin >> c >> x >> y >> z;

   Input:

   1   2   3   4 5.5
   6.6 7 8.8 9.9  10

   Result:

   a = 1  b = 2  c = 3
   x = 4  y = 5.5  z = 6.6
   

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