Editing Operators in C and C++ (section)

===Binding===
The binding of operators in C and C++ is specified by a factored language grammar, rather than a precedence table. This creates some subtle conflicts. For example, in C, the syntax for a conditional expression is:
<syntaxhighlight lang="c">logical-OR-expression ? expression : conditional-expression</syntaxhighlight>
while in C++ it is:
<syntaxhighlight lang="cpp">logical-OR-expression ? expression : assignment-expression</syntaxhighlight>
Hence, the expression:
<syntaxhighlight lang="text">e = a < d ? a++ : a = d</syntaxhighlight>
is parsed differently in the two languages. In C, this expression is a syntax error, because the syntax for an assignment expression in C is:
<syntaxhighlight lang="c">unary-expression '=' assignment-expression</syntaxhighlight>
In C++, it is parsed as:
<syntaxhighlight lang="cpp">e = (a < d ? a++ : (a = d))</syntaxhighlight>
which is a valid expression.<ref>{{cite web |title=C Operator Precedence - cppreference.com |url=https://en.cppreference.com/w/c/language/operator_precedence |website=en.cppreference.com |access-date=10 April 2020}}</ref><ref>{{Cite web|url=https://stackoverflow.com/questions/13515434/does-the-c-c-ternary-operator-actually-have-the-same-precedence-as-assignment/13515505|title=Does the C/C++ ternary operator actually have the same precedence as assignment operators?|website=Stack Overflow|access-date=2019-09-22}}</ref>

To use the comma operator in a function call argument expression, variable assignment, or a comma-separated list, use of parentheses is required.<ref>{{cite web |title=Other operators - cppreference.com |url=https://en.cppreference.com/w/c/language/operator_other |website=en.cppreference.com |access-date=10 April 2020}}</ref><ref>{{cite web |title=c++ - How does the Comma Operator work |url=https://stackoverflow.com/questions/54142/how-does-the-comma-operator-work/ |website=Stack Overflow |access-date=1 April 2020}}</ref> For example, 

<syntaxhighlight lang="cpp">
int a = 1, b = 2, weirdVariable = (++a, b), d = 4;
</syntaxhighlight>