CPP , creating array and i see only one parameter

Question

i create an Array with 3 numbers; i see only one number instead 3

int *ArrayA;
ArrayA = new int[3];
ArrayA[0] = 2;
ArrayA[1] = 4;
ArrayA[2] = 6;

when i debugging and follows ArrayA i see only 2; what could be the problem?

Please make a minimal reproducible example. e.g. how are you printing the values? — cigien
– cigien, Commented Aug 12, 2020 at 17:51
If you're looking at it in a debugger, the debugger is completely unaware that ArrayA points to the first element of an array. — molbdnilo
– molbdnilo, Commented Aug 12, 2020 at 17:53
What debugger are you using? Here's the dupe if you're using VS — cigien
– cigien, Commented Aug 12, 2020 at 17:56
If you're using the Visual Studio debugger you can specify how many elements you want to display in the watch window: ArrayA, 3 will show 3 elements. — Timo
– Timo, Commented Aug 12, 2020 at 17:56

bitmask · Accepted Answer · 2020-08-12 18:12:15Z

2

Your object ArrayA is of type int *. Hence it points to a single int. The fact that you have it point at an int[3] array doesn't change that fact. Your debugger can also not guess that you want it to display more than one value.

Instead of using raw c-style arrays, it is usually recommended to use an std::array.

std::array<int,3> arrayA = {2,4,6};

answered Aug 12, 2020 at 18:12

bitmask

35.2k17 gold badges107 silver badges174 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user4581301 Over a year ago

And if you won't always have a size of 3, consider using std::vector. because you can change the size to whatever you need (within reason, of course).

pho · Accepted Answer · 2020-08-12 19:24:07Z

1

This is not a problem. It's as expected because ArrayA is a pointer. So pointer base address and the address of the 1st element of the array are same. Hence you always see 2 in your debugger. Not sure which debugger you are using, you can try to add ArrayA[index] or *(ArrayA + index) then you can see other values as well.

edited Aug 12, 2020 at 19:24

pho

25.7k8 gold badges48 silver badges75 bronze badges

answered Aug 12, 2020 at 18:36

Sunandan Nandi

741 silver badge7 bronze badges

Collectives™ on Stack Overflow

CPP , creating array and i see only one parameter

2 Answers 2

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related