finish 3 simple c++ programs

please finish 3 simple c++ programs and follow all instructions as the prompt stated.

all 3 prompts are attached down below as jpgs.

"stacklib.h" mentioned in number 2 is also provide, both .doc and.h formats are available.

if you a using .h format(c++ header file),please change the filename to all caps("STACKLIB.h")

thank you very much