What does this code do can you explain plse?

Question

https://code.sololearn.com/ccq0704dZTwX/?ref=app

Answer 1

HonFu i don't get your point can you explain briefly plse

Answer 2

Hm, funny.

With C you never know (unless you *know*) if it's undefined behaviour.

If we ignore that, by using index notation within an array literal, you just seem to be saying:

'Write x to element [47].'

You write the first three elements, then you jump (initializing the values in between with 0), then restart writing at the indexed point.

Answer 3

int a[50] = {1, 2, 3};

would set only the first three values, and the remaining 47 values will be auto-initialized to zero.

After you initialized the array normally, you can define specific array slots like this:

a[47] = 5;

Now your phrase seems to combine this: First three values are regularly initialized, and then suddenly we jump to slot 47 and continue writing from there.

int a = {1,2,3,
[47]=47,50,60};

I have never seen this, and I don't know if this is valid C code or one of the many things in C which you you can do, but shouldn't, because they might work, but maybe won't (aka 'undefined behavior' ).