Answer :
the correct statement that assigns the array's first element with 99 is "myVector[0] = 99;". This is because arrays in C++ are zero-indexed, which means that the first element of the array is located at index 0, not 1.
To explain further, when the array "myVector" is created with the statement "int myVector[4];", it creates an array of 4 integer elements. By default, these elements are initialized with garbage values. The statement "myVector[1] = 99;" assigns the second element of the array (located at index 1) with the value 99, not the first element. Similarly, the statement "myVector(-1) = 99;" is not a valid syntax, and the statement "myVector] = 99;" contains a typo.
In conclusion, to assign the first element of the "myVector" array with the value 99, you should use the statement "myVector[0] = 99;".
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