C C++ Errors Question:

Can you explain exceptions?

An exception is an event, which occurs during the execution
of a program, that disrupts the normal flow of the program's
instructions.

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Explain difference between c/c++ programing language? what is necessity of c++ when existing c programing language?	When i use cout or cin call & then either << or >> .....it shows declaration syntax error...what should i do? cout<<"anything"; int a; cin>>a; return 0;?