What is the difference between '=' and '==' ?

Answer 1

=
assign right side value to left side variable

==
check if both sides are equal
(1==2) has a value 0

if (1==2) cout <<"equal";
equal will not be printed but,

if (1==1)cout <<"equal";
equal will be printed...

Answer 2

= means assignment,== means equals to

Answer 3

in c++ the "==" sign makes the program checks whether it is equal or not and by using "=" we are stating that it is equal