What is the difference between scope and block?

Question

I saw a piece of code in a book, which is as follows:

x = 10;
if(x ==10) { // start new scope
int y = 20; // known only to this block
x = y * 2;
}
         


        

Answer 1

when it comes to conditions and loops if you don't specify {} then immediate following statement is the only statement that will belong to particular condition or loop

e.g.

x = 10;
if(x ==10) 
{ 
int y = 20; 
x = y * 2;
}
both lines get executes only if condition returns TRUE

x = 10;
if(x ==10) 
int y = 20;
x = y * 2; // this is not belong to if condition. therefore it will execute anyway