MadeEasy Test Series 2018: Programming & DS - Prorgramming In C

Question

Consider the following program:

The value printed by the above program is:

1. 20

2. 30

3. 40

4. 50

I think it will be undefined behaviour because of:
arr[count++] = incr();

But I am not sure. need to confirm.

Comments

i also thought so but it works fine

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I dont think so i think it will be evaluated as arr[count++] evaluated after incr() evaluated.

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@Anu see Example 2 at the end of this selected answer: https://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points

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Rishabh a[count++] = ++count ; has confusion which to acsess 1st , so undefined behaviour.
But in given program we force ++count to evaluate 1st .

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So, does that mean if we have a function call it will be evaluated first?

Do you have any source to read this?

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Wouldn't it be 30?

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@kiran Yes answer will be 30.
And arr[0] = 2

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finally what will be the ans ??coz i am also confused

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@Rishabh Gupta  shouldn't it be arr[0] = 1 as it will store the value returned by the function call incr() which is 1 and then count++ makes value of count as 2 to be used in the next printf statment?