So I tried this: int arr[3];

Question

So I tried this: int arr[3];

arr[0] = 1;
arr[2] = 2;

std::cout << *(arr + 1) << std::endl;

This is the output i got:
677446592

Since data in array are contiguous, why didn't I get 2?

0

25.01.2021

9 ответов

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Kirill 🚜

Because you didn't set second element of an array

0

25.01.2021

🖖 Автор вопроса

Kirill 🚜
Because you didn't set second element of an array

oh so space for it reserved?

0

25.01.2021

Kirill 🚜

🖖
oh so space for it reserved?

Yes

0

25.01.2021

Alejandro

🖖
oh so space for it reserved?

its like if you try to do a print for int a; without setting the data

0

25.01.2021

🖖 Автор вопроса

Kirill 🚜
Yes

...so what am I shifting when I do "arr[1] =2", that makes the insertion time O(n)?

0

25.01.2021

Alejandro

🖖
...so what am I shifting when I do "arr[1] =2", th...

you are not inserting anything, you are setting the value of an element

0

25.01.2021

🖖 Автор вопроса

Alejandro
you are not inserting anything, you are setting th...

oh now I see

0

25.01.2021

Mmmmm.....

This is undefined behavior, there is called stack redzone. It may contain garbage value from previous function. You are printing this garbage value.

0

25.01.2021

Alejandro · Accepted Answer

Alejandro

your data is contiguos but the [1] element has no value set

0

25.01.2021

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So I tried this: int arr[3];

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