Question

Consider the following code. (Assume that all variables are properly declared.)

cin >> ch;
while (cin)
{
cout << ch;
cin >> ch;
}
This code is an example of a(n)______ while loop.
A. Pre-test.
B. Post-test.
C. Infinite.
D. Sentinel-controlled.

Answer 1

The provided code represents a sentinel-controlled while loop, which reads and prints characters from the input until a sentinel condition such as an input failure or end-of-file is met.

Step-by-step explanation:

The code you've provided is an example of a sentinel-controlled while loop. This type of loop continues to execute until a certain sentinel value is encountered which signifies the end of the input or data stream. In the context of the given code, the loop reads a character from input into the variable ch and then enters the while loop. As long as the cin operation is successful (meaning there is no input failure or it hasn't reached the end of the file), it will print the character and ask for the next one. The loop will stop executing when there is an input error or if an end-of-file condition is reached.