Loops

Question

for(int ii=0; ii<4;ii++){
for(int ii=0;ii<5;ii++){
//
}
}
Can the same variable be used though the scope is different?

Answer 1

If the scope is different than so is the variable

'ii' in the outer loop is a completely different variable from the 'ii' in the inner loop

This is called variable shadowing and happens both in c++ and in python, as well as in many other programming languages

You can't get access to a shadowed variable

Answer 2

Yes.
res = 0
for i in [[1],[2],[3]]:
for j in i:
res+=j

Answer 3

Yes you can, only in c++ the variable ii will be overridden.