In C++ all names (including variables) must be declared before they can be used.
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Yes.
If you declare a variable inside of any fuction (except main) it will not be available to other functions.
turbo c
The need to declare header files is not compulsory in C++. You may place all your code in a single source file if you so desire. However, header files are useful in that they separate interface from implementation and aid in hiding information.
TLINK is the Turbo C++ linker utility. You use it to link the object files created by the Turbo C++ compiler.