I need a C program that will display a measurement in either

I need a C++ program that will display a measurement in either inches or centimeters. it should allow a user to convert between each. also the program should use two program-defined functions. Thanks!

Solution

main.cpp

#include <iostream>
using namespace std;

// function declaration
double inch2cm(double num1);
double cm2inch(double num2);

int main () {
   // local variable declaration:
    int menuOption;
    double inches, centimeters,ret1,ret2;
    cout << \"Enter the number (1) to convert centimeters to inches.\ \";
   cout << \"Enter the number (2) to convert inches to centimeters.\ \";
   cout << \"Menu Option: \";
   cin >> menuOption;
   cout << \"\ \ \";

    switch (menuOption)
      {
         case 1:
            cout << \"Please enter centimeters to convert to inches: \";
            cin >> centimeters;
            ret1 = cm2inch(centimeters);
            cout << \"The conversion from centimeters to inches is : \"<<ret1 <<\"inches.\";
            break;
         case 2:
            cout << \"Please enter inches to convert to centimeters: \";
            cin >> inches;
            ret2 = inch2cm(inches);
            cout <<\"The conversion from inches to centimeters is : \"<<ret2<<\"centimeters.\";
            break;
         default:
            cout << \"Unknown menu selection!\ \";
      }
   return 0;
}

double cm2inch(double num2)
{
    double n2;
    n2=num2*0.393701;
    return n2;
    }
double inch2cm(double num1) {
    double n1;
    n1=num1*2.54;
    return n1;
}

Output :