Answer 1

An error will actually crash the program, whereas a bug will cause it to not work right.
// Bug
// Expecting count from one to five
count = 1
while (count < 5)
{
cout << count << endl;
count++;
}
// Output:
// 1
// 2
// 3
// 4
// Not quite right.
// Error
num = 42 / 0
// Program crashes