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The first sub-statement of an if statement may be followed by the keyword else. The sub-statement after the else keyword will be executed when the condition is false (that is, when the first sub-statement is not executed).

int x;
std::cin >> x;
if (x % 2 == 0) {
    std::cout << "The number is even\n";
} else {
    std::cout << "The number is odd\n";

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