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Which assigns the vector's first element with 99?

```cpp
vector myvector(4);
```

A. `myvector() = 99;`

B. `myvector(-1) = 99;`

C. `myvector(0) = 99;`

D. `myvector(1) = 99;`

Answer :

Final answer:

The correct way to assign the first element of a vector 'myvector' with 99 in C++ is by using myvector[0] = 99;. Hence, the correct multiple-choice option, given the provided options, would be 'c. (0) = 99;'.

Explanation:

To assign the first element of a vector in C++ to 99, after the declaration vector myvector(4);, the correct way to do this would be by using the index 0 because C++ uses zero-based indexing. Therefore, the correct statement to use would be myvector[0] = 99;. In the context of the multiple-choice options presented, 'a. () = 99;' is incorrect, 'b. (-1) = 99;' is incorrect as it would result in accessing an out-of-bound index which is undefined behavior, 'd. (1) = 99;' would incorrectly try to assign the second element of the vector with 99 which is also not the question's demand. Hence, the correct option would be 'c. (0) = 99;'. Please remember, this last format is not syntactically correct C++ code; square brackets should be used instead of parentheses for indexing.

To assign the vector's first element with 99, you would use the option (0) = 99. The vector declaration 'vector myvector(4)' creates a vector of size 4, with all elements initialized to zero. To assign a specific value to the first element, you would use the index operator '(0)' to access the element and then set it equal to 99.

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