What is the value of y at the end of main? const int x = 5; int main(int argc, char** argv) { int x[x]; int y = sizeof(x) / sizeof(int); return 0; }
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0
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5
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undefined
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2
The global const int x = 5 is used to size the array inside main (int x[x] creates array of 5 ints). sizeof(x) on the array returns 5 * sizeof(int) = 20 (assuming 4-byte int). Dividing by sizeof(int)=4 gives y = 5. The local array x shadows the global x for the rest of the block.
To determine the value of y at the end of main, let's go through the code step by step:
const int x = 5;
int main(int argc, char** argv)
{
int x[x];
int y = sizeof(x) / sizeof(int);
return 0;
}
In this code, we have a constant integer x initialized with the value of 5.
Next, we declare an array x with the size of x, which is 5. This means we are declaring an array with 5 elements.
Then, we calculate the value of y by dividing the size of the array x (which is 5 * sizeof(int)) by the size of an int (sizeof(int)).
The sizeof operator returns the size of a data type in bytes. In this case, sizeof(int) returns the size of an int in bytes.
Since the size of an int is typically 4 bytes, the size of the array x is 20 bytes (5 * 4).
Therefore, y is equal to the size of the array x (20 bytes) divided by the size of an int (4 bytes), which is 5.
Hence, the correct answer is B) 5.