When we use Abstract Class and when we use Interface?where we will implement in real time?

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Out of fgets() and gets() which function is safe to use and why?

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Explain the difference between abstract class and interface in c++?

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What can I safely assume about the initial values of variables which are not explicitly initialized?

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What is the difference between the parameter to a template and the parameter to a function?

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If I is an integer variable, which is faster ++i or i++?

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Define copy constructor.

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Inline parameters : What does the compiler do with the parameters of inline function, that can be evaluated in runtime ?

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What is the use of endl in c++ give an example?

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Can we make any program in c++ without using any header file and what is the shortest program in c++.

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Is string data type in c++?

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this is to swap to strings....but in output the whole strings are swapped leaving first as it is...why it is so #include<iostream.h> int main() { char a[]="ajeet"; char b[]="singh"; long x=*a; long y=*b; cout<<x<<":"<<y; x=x+y; y=x-y; x=x-y; *a=x; *b=y; cout<<x<<":"<<y; cout<<&a<<endl; cout<<&b<<endl; }

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