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The keyword if must be followed by a parenthesized condition, which can be either an expression or a declaration.

If the condition is truthy, the sub-statement after the condition will be executed.

#include <iostream>

int main()
    int x = 1;
    if (x > 0) {
        std::cout << "x (" << x << ") is greater than zero\n";
x (1) is greater than zero

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