Arduino - Comparison Operators


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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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