(JAVA)variable declaration outside then initialization inside FOR statement?

Question

I'm just wondering if is this possible and will not return error:

int i= 1;
FOR (i=1; i < 10; i++){
statements;
}

is this the same as:

FOR (int i = 1; i < 10; i++){
statements;
}


thanks

Answer 1

Other than i being visible outside the loop, it's equivalent. Also, you don't have to repeat the i=1 in the loop; you can just leave the first part blank:



int i = 1;

for (; i < 10 ; i++) ...



@M

Answer 2

It would have been less work for you to try this than it was for you to ask this question, think about that, now down to business:



There is no such thing as a FOR statement in Java. Its "for" (lower case), Java is case sensitive, the code you posted will not even compile.



These will compile:



int i= 1;

for (i=1; i < 10; i++){

//statements;

}



for (int j = 1; j < 10; j++){

//statements;

}

Answer 3

int i= 1;

for(i=1; i < 10; i++){

statements;

}



Now, if you check, i value is 10. That is, i scope is still active.



for(int i = 1; i < 10; i++){

statements;

}

After the for loop, i is undefined or i's scope is over. You can not access i.

Answer 4

It is possible, however in the case of the first one, the int i will persist past the life of the for loop holding the final value of the counter (in this case 10)

Answer 5

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Answer 6

The only difference is that in first case you can use "i" in whole program and in secound only in that FOR loop.