Greater than

• ==, !=, <, >（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.

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