cpp / beginner
Snippet
Operator Precedence and Parentheses
Operator precedence determines how expressions are evaluated. Multiplication has higher precedence than addition. Logical AND (&&) has higher precedence than OR (||). Always use parentheses to make your intent clear and avoid bugs.
snippet.cpp
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#include <iostream>int main() {int a = 5, b = 3, c = 8;int result1 = a + b * c;int result2 = (a + b) * c;bool isValid = (a > 2) && (b < 10) || (c == 8);std::cout << "a + b * c = " << result1 << std::endl;std::cout << "(a + b) * c = " << result2 << std::endl;std::cout << "isValid = " << isValid << std::endl;return 0;}
Breakdown
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a + b * c
Multiplication evaluated first: b * c = 24, then a + 24 = 29
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(a + b) * c
Parentheses force addition first: (5+3) = 8, then 8 * 8 = 64
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(a > 2) && (b < 10)
Comparison operators have lower precedence than arithmetic
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isValid = ...
Without parentheses, && would bind tighter than ||