question related past question on how to use not equal to for two numbers

[DEAbhishekBUG]

sir i am a student and i always want to learn more
i replied for the question -how-do-i-say-not-equal-more-than-one-number
my reply was
1> if given variable is either not equal to 1 or 2 you need to code:
if((variable !=1)||(variable !=2)) // ' | '(just above enter key ) :is called as pipeline operator and is logical equivalent of " or "

2>if given variable is not eqal to both 1 & 2 :
if((variable !=1)&&(variable !=2)) // ' & ' :is and operator

i want to know in what situation or circumstance this is not useful so please help me learn basics of this language

[Banfa]

1) It is not useful in any situation, or put it another way there is no situation in which this expression is useful.

Calculate the logic on paper assign a value to variable and calculate the value of

(variable !=1)||(variable !=2)

you will quickly find that it always has the value true.

2) This is a useful and common construct, however the "not useful" comment you are referring to was only referring to the logic in example 1.

[mush1578]

1: means if any one these two variable not equal then do that

2: use for that if both these variable are not equl then do that

[DEAbhishekBUG]

thank for your response i got the point