Final answer:
The mistake in the statement 'cin << score;' is the use of the wrong operator. The correct operator for input is '>>', so the statement should be 'cin >> score;'. It is also important to declare the variable 'score' with the appropriate data type prior to its use.
Step-by-step explanation:
The student has asked about the correctness of the C++ statement cin << score;. First, let's clarify that this statement is intended to read a value into the variable score from standard input. In C++, the extraction operator >> is used for this purpose, not the insertion operator << which is intended for output.
To correct the statement, it should be cin >> score;. Here, cin is the standard input stream and score is a variable that is supposed to hold the value inputted by the user. The corrected statement signifies that the program is expecting an input value from the user, which will be stored in the variable score.
It's also crucial to ensure that the variable score is declared before this statement and that it is of a compatible data type to hold the expected input. If the variable is intended to hold an integer, the declaration should look like int score;, done earlier in the code.
For better understanding, here's an example of how it would be used within a program:
#include <iostream>
using namespace std;
int main() {
int score;
cout << "Enter your score: ";
cin >> score;
cout << "You entered: " << score << endl;
return 0;
}
This program prompts the user for a score, reads the input, and then outputs the entered score back to the user.