Name: _______Key________

Quiz 8 (Week 9) Key

CS-150, Winter '02, Dr. C. S. Tritt

1. What output would the following fragment of C++ source code produce?

double x;

int y;

ifstream fin;

fin.open("stuff.txt");

while (fin >> x >> y)

cout << "Result is: " << x*y << '\n';

fin.close();

Assume the file stuff.txt contains:

1.3 4

3.4 2

Answer Result is: 5.2

Result is: 6.8

Integer answers –10

2. Write a fragment of C++ code that uses a for loop to display a series of values from type const double value Y to type const double value Z by 0.5. For example if Y were 2.5 and Z were 4.0 the series 2.5 3.0 3.5 4.0 would be displayed.

Answer: for (double x = Y; x < Z; x = x + .5) cout << x << " ";

Attempting to increment a constant –15.