!= (Not equal to)
From Microduino Wiki
- ==, !=, <, >（comparison operators）
Comparison operators：
if(x == y)
{
// execute certain statements
}
//If x is equal to y, execute the statement in the brackets.
if(x != y) //If x is not equal to y, execute the statement in the brackets.
if(x < y) //If x is less than y, execute the statement in the brackets.
if(x > y) //If x is larger than y, execute the statement in the brackets.
if(x <= y) //If x is less than or equal to y, execute the statement in the brackets.
if(x >= y) //If x is larger than or equal to y, execute the statement in the brackets.
- Note：
When using the assignment operator（for example if (x = 10)）, single “=” is the assignment operator, which is to set the value of x as 10（put 10 into the internal storage of variable x）.
This is because C calculates according to the following rule if (x=10)：assign 10 to x（as long as it is the assignment statement of non-zero value, the result is always true），so the current value of x is 10. And at the same time, the test expression value is 10, and the value is always true, because non-zero values are always true.
