In C your code is sequential. C++ is Object-Oriented Language.

C is a Procedural programming language. C++ is Object oriented programming language. In C data is not secure while in C++ is data secure. In C top down approach, while in a C++ bottom up approach. C is function driven but not support function overloading while in C++ object driven and support function overloading. C++ use a reference variable while C not use.

still not clear the difference

One of the major differences between C and C++ is that C++ is object oriented programming language, but C is not at all. You can Google Object Oriented Programming for more details.

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C is Imperative (procedural) systems implementation language and C++ is Multi-paradigm, object-oriented programming, generic programming, procedural programming, functional programming, meta programming language.