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The >= (greater than or equal to) operator is a binary relational operator that compares two operands. It evaluates whether the value of the left operand is strictly greater than or mathematically equal to the value of the right operand. 
operand1 >= operand2

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Return Value

In C, relational operators do not return a dedicated boolean type. The >= operator yields a result of type int:
  • Returns 1 if the left operand is greater than or equal to the right operand.
  • Returns 0 if the left operand is strictly less than the right operand.

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Operand Types and Conversions

The operator accepts operands of arithmetic types (integer, floating-point) or pointers. Arithmetic Operands: When comparing arithmetic types, the compiler applies the usual arithmetic conversions before the comparison occurs. This ensures both operands are promoted to a common type.
  • Signed/Unsigned Mismatch: If one operand is signed and the other is unsigned, and they have the same rank, the signed operand is implicitly converted to unsigned. This can cause negative numbers to be evaluated as large positive numbers, altering the result of the >= comparison.
  • Floating-Point NaN: If either operand is NaN (Not-a-Number), the >= operation will always evaluate to 0 (false).
Pointer Operands: When comparing pointers, both operands must be pointers to compatible types.
  • The comparison evaluates the relative memory addresses of the pointers.
  • The behavior is strictly defined only if both pointers point to elements within the same array, or one past the last element of that array.
  • Using >= to compare pointers to distinct, unrelated objects results in undefined behavior.

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Precedence and Associativity

  • Precedence: The >= operator has lower precedence than arithmetic operators (like +, -, *, /) but higher precedence than equality operators (==, !=) and logical operators (&&, ||).
  • Associativity: It evaluates from left to right.
Because of left-to-right associativity and the int return type, chaining the operator (e.g., a >= b >= c) is syntactically valid but rarely produces the intended mathematical evaluation. The compiler parses it as (a >= b) >= c, meaning the integer result (0 or 1) of the first comparison is subsequently compared against c.
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