I was going through the tutorial. But in one e.g.:there is no declaration of integer 'x' in the code.why? Or it isn't necessary?

Question

#include <iostream>
using namespace std;

int main()
{
int arr[] = {11, 35, 62, 555, 989};
int sum = 0;

for (int x = 0; x < 5; x++) {
sum += arr[x];
}

cout << sum << endl;

return 0;
}

Answer 1

@Vinamra yes but pay attention because there are Global and Local variables.
a global variable is usually declared at the beginning of the code, outside the main() and you can use it anywhere
a local variable is defined only inside a function or a loop and outside of it the variable doesn't exist
try to take a look at this code
https://code.sololearn.com/cllhemp4oUo7/?ref=app

Answer 2

"int x = 0;"

Answer 3

It was declared in the for loop

Answer 4

in the for there is "int x=0"
this is a declaration useful when you want to use the variable in a for loop

Answer 5

so,if I want to use some integer value or string value.. can I declare it in my code wherever it is needed??

Answer 6

@Matte,thank you :)

Answer 7

The variable's scope is essentially the block it is declared inside.

Answer 8

you're welcome :)