Variable declare & Assign value in C++

Question

Is it possible to declare a variable without assigning value in C++?

int a; int a=15; Which one will be Correct?

If i assign value to a variable 3 times or more which one will count at the end in C++?? int a=15; int a=10; int a=5; Which value will be execute for a at the end?

Can you show a specific example of code you are concerned about? — Cory Kramer, Apr 24 '20 at 15:43
I can see that, but that does not help answer your question. — Cory Kramer, Apr 24 '20 at 15:52
@Engr.KaziShahadatHossain Maybe you should get one of [these](https://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list) so that you don't have to go through asking similar questions in the future. — Ruks, Apr 24 '20 at 15:53

score 3 · Accepted Answer · answered Apr 24 '20 at 15:50

3

int a; // declared but not assigned
a = 1; // assigning a value
a = 2; // assigning a different value
a = 3; // assigning another value
std::cout << a << "\n"; // will print 3 since only the last assignment matters

answered Apr 24 '20 at 15:50

Aplet123

33,825
1
29
55

Thank you very much.. Now its clear to me – Engr. Kazi Shahadat Hossain Apr 24 '20 at 15:56
1

This make the clear sense for a beginer – Shahadat Atom Apr 24 '20 at 17:30

score 2 · Answer 2 · answered Apr 24 '20 at 15:49

2

int x; declares a variable x without assigning a value.

If you assign to a variable three times then which ever assignment executed last will be the variables final value. Very important idea, C++ statements execute in a specific order, and which order they execute in is essential to understanding what a program does.

answered Apr 24 '20 at 15:49

john

85,011
4
57
81

Thank you Can you Please give an Example so that i can clearly understand. – Engr. Kazi Shahadat Hossain Apr 24 '20 at 15:53
1

@Aplet123 gave you a good example. – john Apr 24 '20 at 16:02

Variable declare & Assign value in C++

2 Answers2