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  A calculator   is a portable device that helps to perform simple mathematical calculations in our daily lives such as  addition, subtraction, division, multiplication , etc. In this section, we will create  calculator program in C++ using function. Using Function Lets' create a calculator program in  C++  using the  function  and  Switch   statement. 1.     #include<iostream.h>    2.     #include<stdio.h>    3.     #include<conio.h>    4.     #include<math.h>    5.     #include<stdlib.h>    6.     void  add();   7.     void  sub();   8.     void  multi();   9.     void  division();   10. void  sqr();   11. void  srt();   12. void  exit();   13. void  main()   14. {   15. clrscr();   16. int  opr;   17. // display different operation of the calculator    18. do    19. {   20. cout <<  "Select any operation from the C++ Calculator"    21.       "\n1 = Addition"