Question

Which line in the following program will cause a compiler error?

1 #include
2 using namespace std;
3
4 int main()
5 {
6 const int MY_VAL = 77;
7 MY_VAL = 99;
8 cout << MY_VAL << endl;
9 return 0;
10 }

A) 6
B) 8
C) 9
D) 7

Answer 1

The compiler error occurs at line 7, where a new value is incorrectly assigned to the constant MY_VAL, violating the const keyword rules in C++ by trying to modify a constant variable.

Step-by-step explanation:

The line in the program that will cause a compiler error is line 7. In C++, when you declare a variable with the const keyword, it means that the value of the variable cannot be modified once it has been initialized.

Therefore, trying to assign a new value (99) to a constant (MY_VAL) in line 7 will result in a compiler error because you cannot change the value of a constant after its initialization.

The line that will cause a compiler error is line 7.

This is because MY_VAL is declared with the const keyword, which makes it a constant variable that cannot be changed after initialization. Attempting to assign a new value to MY_VAL at line 7 will result in a compilation error.