How do you declare an array of size 10?

The usual way of declaring an array is to simply line up the type name, followed by a variable name, followed by a size in brackets, as in this line of code: int Numbers[10]; This code declares an array of 10 integers.

What is the maximum size of array we can declare?

An array can have a maximum of eight dimensions. You declared an array whose total size is greater than the maximum allowable size. The maximum allowable array size is 65,536 bytes (64K).

How big can you make an array in C++?

The maximum size of an array is determined by the amount of memory that a program can access. On a 32-bit system, the maximum amount of memory that can be addressed by a pointer is 2^32 bytes which is 4 gigabytes.

Can we increase the size of an array in C?

Arrays are static so you won’t be able to change it’s size. You’ll need to create the linked list data structure.

What is the maximum size of array we can define in C++?

Maximum size can be 10^8 if you define the array to be global otherwise if it is defined in a local function maximum size can be 10^6 and you can take this size of array in online judges too, be it codechef or codeforces. The above sizes of array is for int datatype.

Can I declare array without size?

Answer: No. It is not possible to declare an array without specifying the size. If at all you want to do that, then you can use ArrayList which is dynamic in nature.

Can I declare an array with a size of 80 MB?

Yes you can. Size of the array will be around 80 MB. I am guessing this much free RAM would be available. Just calculate the size of array. Another thing to notice is, local variables are stored in stack section of memory while global in heap section. Most OS limit stack size to 256 MB. So if your size is more than that, declare array globally.

What is the maximum size of an array index?

The index of an array might be of type long long, which is at least 64 bit wide (look in your limits.h). Practically on most systems you will run much earlier into problems. Systems that allow for more than 64bit addresses are rare and even then you will hardly get enough memory to use the maximum compiler allowed size for an array.

How much memory do I need for a 10^9 array?

An array of 10^9 longs would typically take up at least 4GB of memory, which would already be prohibitive in all 32-bit systems. Even if that much memory is available in a 64-bit system you certainly cannot expect to allocate 4GB on the stack like this:

Is it possible to initialize an array during declaration?

It is possible to initialize an array during declaration. For example, You can also initialize an array like this. Here, we haven’t specified the size. However, the compiler knows its size is 5 as we are initializing it with 5 elements. Here’s how you can take input from the user and store it in an array element.