Arduino - Comparison Operators

Assume variable A holds 10 and variable B holds 20 then −

Operator name	Operator simple	Description	Example
equal to	= =	Checks if the value of two operands is equal or not, if yes then condition becomes true.	(A == B) is not true
not equal to	! =	Checks if the value of two operands is equal or not, if values are not equal then condition becomes true.	(A != B) is true
less than	<	Checks if the value of left operand is less than the value of right operand, if yes then condition becomes true.	(A < B) is true
greater than	>	Checks if the value of left operand is greater than the value of right operand, if yes then condition becomes true.	(A > B) is not true
less than or equal to	< =	Checks if the value of left operand is less than or equal to the value of right operand, if yes then condition becomes true.	(A <= B) is true
greater than or equal to	> =	Checks if the value of left operand is greater than or equal to the value of right operand, if yes then condition becomes true.	(A >= B) is not true

Example

 void loop () { int a = 9,b = 4 bool c = false; if(a == b) c = true; else c = false; if(a != b) c = true; else c = false; if(a < b) c = true; else c = false; if(a > b) c = true; else c = false; if(a <= b) c = true; else c = false; if(a >= b) c = true; else c = false; }

Result

 c = false c = true c = false c = true c = false c = false

arduino_operators.htm

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