DS and programming

Question

#include <stdio.h>

int arr[] = { 10, 20, 30, 40, 50 };

static int count ;

inc() {

return ++count;

}

int main()

{

arr[count++]=inc();

printf("%d ", arr[count]);

printf("%d ", arr[0]);

}

https://ideone.com/5LOuqj 

 

Comments

when post-increment happens a temporary variable is created which stores the initial value but original variable is incremented at the moment.

that's why when inc() is executing it finds count with value 1.

---

https://ideone.com/5LOuqj 

yes it is 30 2

---

Undefined behaviour

https://stackoverflow.com/questions/23990968/please-explain-the-output-of-following-c-code

Answer 1

the answer is 30,2 here

 

Comments

here calculated address of 'a', which can't effect by first executing LHS or RHS part of '='

---

have u any reference? I havenot got how r u telling that for = it is giving undefined behaviour

---

It's not undefined expression , [ ] has higher precedence than = , it will evaluate first,including the expression inside the [].

Answer must be 30 2.

Answer 2

undefined behavior

https://stackoverflow.com/questions/23990968/please-explain-the-output-of-following-c-code

Answer 3

undefined behaviour  Sequence Point Problem.

arr[count++]=inc();

arr[count++]=++count;

Comments

it's undefined behaviour due to which side of '=' evaluate first but not sequence problem !