int main()
{
int arraySize;
int arrayMain[arraySize-1];
cout << "\n\nEnter Total Number of Elements in Array.\n\n";
cin >> arraySize;
arrayMain[arraySize-1]={0};
cout <<"\n\n" <<arrayMain;
return 0;
}
my compiler freezes when I compile the above code. I am confused on how to set a dynamic array to 0?
You use a std::vector:
std::vector<int> vec(arraySize-1);
Your code is invalid because 1) arraySize isn't initialized and 2) you can't have variable length arrays in C++. So either use a vector or allocate the memory dynamically (which is what std::vector does internally):
int* arrayMain = new int[arraySize-1] ();
Note the () at the end - it's used to value-initialize the elements, so the array will have its elements set to 0.
std=c++11?if you want to initialize whole array to zero do this ,
int *p = new int[n]{0};
If you must use a dynamic array you can use value initialization (though std::vector<int> would be the recommended solution):
int* arrayMain = new int[arraySize - 1]();
Check the result of input operation to ensure the variable has been assigned a correct value:
if (cin >> arraySize && arraySize > 1) // > 1 to allocate an array with at least
{ // one element (unsure why the '-1').
int* arrayMain = new int[arraySize - 1]();
// Delete 'arrayMain' when no longer required.
delete[] arrayMain;
}
Note the use of cout:
cout <<"\n\n" <<arrayMain;
will print the address of the arrayMain array, not each individual element. To print each individual you need index each element in turn:
for (int i = 0; i < arraySize - 1; i++) std::cout << arrayMain[i] << '\n';
