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Local scopes may be nested, in which case the inner scopes override the outer scopes. For example, in int xyz; void Foo (int xyz) { if (xyz > 0) { double xyz; //... } } // xyz is global // xyz is local to the body of Foo // xyz is local to this block there are three distinct scopes, each containing a distinct xyz. Generally, the lifetime of a variable is limited to its scope. So, for example, global variables last for the duration of program execution, while local variables are created when their scope is entered and destroyed when their scope is exited.

For example, for (int i = 1; i <= 3; ++i) for (int j = 1; j <= 3; ++j) cout << '(' << i << ',' << j << ")\n"; produces the product of the set {1,2,3} with itself, giving the output: (1,1) (1,2) (1,3) (2,1) (2,2) (2,3) (3,1) (3,2) (3,3) ¨ 40 C++ Essentials Copyright © 2005 PragSoft The continue Statement The continue statement terminates the current iteration of a loop and instead jumps to the next iteration. It applies to the loop immediately enclosing the continue statement. It is an error to use the continue statement outside a loop.

Bitwise exclusive or compares the corresponding bits of its operands and produces a 0 when both bits are 1 or both bits are 0, and 1 otherwise. Bitwise left shift operator and bitwise right shift operator both take a bit sequence as their left operand and a positive integer quantity n as their right operand. The former produces a bit sequence equal to the left operand but which has been shifted n bit positions to the left. The latter produces a bit sequence equal to the left operand but which has been shifted n bit positions to the right.

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