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in overloading functions with same name are used but they have different parameters type or no. for better understanding u may follow this link geeksforgeeks.org/function-overloading-in-c/
while overriding is concept in inheritence ,function with same name and parameters are present both in base and child class .

Overloading:
One must change either parameter type or number of parameters for a method belongs to the same class.
Overriding:
overriding a method means that a method inherited from a base class is what’s being changed.

Overloading is resolved at Compile time ....overriding is resolved at Run time ......

google it..:P

When two or more different declarations are specified for a "single name" in the "same scope" , that name is said to be overloaded.Overloading always happens in same scope and NOT across scope as in same names in base class/derived class.When overloaded base class method is redefined in derived class, it hides all the overloaded members of base class in scope of derived class

Overriding applies to only to inheritance when a virtual method in base class is redefined in derived class. An overriding virtual function has to match the signature and the return type of the function it overrides(except that return type of a public base can be changed to the type of a derived class)

Adding one more point "return type of functions must be same".