WebAug 27, 2013 · In fact, in C++ it's more or less obsolete, just use a plain literal 0 instead, the compiler will do the right thing depending on the context. In newer C++ (C++11 and higher), use nullptr (as pointed out in a comment, thanks). Otherwise, add #include < stddef.h > to get the NULL definition. Share Improve this answer Follow Webcin stands for console input . cin statement in C++ is used to read input from keyboard. cin is an instance of the istream. It can be used to read value of a variable. It is followed by extraction operator ( >>) followed by a variable whose value you want to read. The header file required is . You also need to use std namespace use ...
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1.1 — Statements and the structure of a program – Learn C++
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