Shouldn't be the var name be defined before it's use? Please correct me if i am wrong.

Answer 1

You are right. A variable should always be defined before its use, because the basic purpose of a variable is to hold a value for furthur use.

But if you are mis-interpreting the terms- variable definition and variable declaration, then read MrCoder's comment.

Answer 2

No @MrCoder,

A variable cannot be declared twice in same scope.
Try your program in playground and check the result.

Answer 3

0.o
@MrCoder,
you defined it first and declare it later?
I don't know about ruby but in C,C++, Java and PHP, rule is to declare first and then define or do both simultaneously.

Answer 4

@MrCoder, That's what everyone do 😁
Declare and define.

Answer 5

@Supersebi3 Ohh... so thats why I get confused with JavaScript... you dont need to put a data type before the var name..

Answer 6

@Supersebi3 Alright I got it, thanks :D

Answer 7

Oh wait I meant I declared it and defined it later😂

Answer 8

@Sachin Artani I usually declare and define when making games😂

Answer 9

@MrCoder the correct code would be

int main() {
string x;
//code
x = "A value is given";
cout << x;
return 0;
}

Answer 10

@MrCoder only when declaring it

Answer 11

Define is where you give a variable its value, However that variable name you mentioned was probably Declared which means it has no given value yet.

Answer 12

Also you can Declare a variable first and declare them later:
(Thanks Sachin Artani :D)

#include <iostream>
using namespace std;

int main() {
int x;
//Some lines of code later...
int x = "A value is given";
cout << x;
}

Answer 13

@Sachin Artani
Huh. Hhmm... I tried that on Ruby I defined it and declared it later. Maybe I was wrong or it is programming language dependent

Answer 14

I meant declare in the first place anyway guys. I just typed in define by mistake. Anyway, thank you guys for helping.