= operator in C language is used to assign the value of
right-hand side value/variable/expression to the left hand
side variable.
== operator in C/C++ language is used to check the value of
left hand variable/expression with the right hand
variable/expression. whether the two values are equal or
not. It returns true if these are equal else it will return
false.
1. First of all = is a assignment operator and == is a
comparision operator
2.= give you the same vale like x=y means if x=5 then y=5
on the otehr hand if x==y then it will give you the true or
false
eg if x==5
y==5
then return true
= is the assigment operator
=is used to copy
ex:
a=5 means, copy just that value for 'a'.
== is comparision operator
ex:
#include<stdio.h>
void main()
{
int a;
scanf("%d",&a);
if(a==5)
printf("welcome");
else
printf("if the is not equal to 5");
}
= Assignment Operator
== Comparision Operator
One Intresting Difference between these two is in the =
operator the left side can not be a const, while in == we
can place Const in either side.
eg. x = 5 //correct
5 = x // Incorrect
but X == 5 // CORRECT
5 == X // Correct and Preffered to use left value
as constant to avoid the unwanted bug.
class Foo {
int x;
public:
Foo(int I);
};
If a class does not have a copy constructor explicitly
defined one will be implicitly defined for it. Referring to
the sample code above, which one of the following
declarations is the implicitly created copy constructor?
a) Foo(Foo *f);
b) Foo(Foo &f);
c) Foo(const Foo *f);
d) Foo(const Foo &f);
e) Foo(int);
string somestring ;
Which of the following choices will convert a standard C++
string object "somestring" to a C string?
a) Copy.somestring () ;
b) somestring.c_str ()
c) &somestring [1]
d) std::cstring (somestring)
e) (char *) somestring
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