Question

c++ I am suppose to write a function that gets a number from a user, say 3.123456789 and then the program gets another number from the user which is used to find out how many decimal digits we want rounded to. So if the user inputs 3 then the number would turn into 3.123 then we are suppose to add two digits next to the rounded number so it would turn into 3.12300. the rounding is suppose to be done in a function and I am suppose to write a prototype. This is what I have so far.

// Insert here the prototype of the function here

int main()
{
   // Declare variable value, valuero that hold double precision real numbers
   double value;
   double valuero;

   // Declare variable decdig that holds whole numbers
   int decdig;
   // Prompt the user to "Enter the real number: "
   cout << "Enter a real number:";

   // Read from keyboard the value entered by the user and assign it to side
   cin >> value;
   // Prompt the user to "Enter number of digits: "
   cout << "Enter number of digits";

   // Read from keyboard the value entered by the user and assign it to decdig
   cin >> decdig;
   // Round the real number to the number of decimal digits specified and assign the result to valuero
  
   // Format the output to display the numbers in fixed format with ten decimal digits

   // Display on the screen, using 23 columns, the message
   //   "The original number is ", value
   cout << "The original number is: " << value << endl;
   // Format the output to display the numbers in fixed format with the number of decimal digits specified plus 2

   // Display on the screen, using 23 columns, the message
   //   "The rounded number is ", valuero
   cout << "The rounded number is: " << valuero << endl;

       system("pause");

// Rounds the value received in the first parameter to the number of digits received in the second parameter

Answer 1

`Hey,

Note: Brother if you have any queries related the answer please do comment. I would be very happy to resolve all your queries.

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#include <iostream>
#include<cmath>
#include<iomanip>
using namespace std;
int main()
{
// Declare variable value, valuero that hold double precision real numbers
double value;
double valuero;

// Declare variable decdig that holds whole numbers
int decdig;
// Prompt the user to "Enter the real number: "
cout << "Enter a real number:";

// Read from keyboard the value entered by the user and assign it to side
cin >> value;
// Prompt the user to "Enter number of digits: "
cout << "Enter number of digits";

// Read from keyboard the value entered by the user and assign it to decdig
cin >> decdig;
// Round the real number to the number of decimal digits specified and assign the result to valuero
valuero=(double)round((double)round(value*(double)pow(10,decdig))*(double)pow(10,2))/(double)pow(10,decdig+2);
// Format the output to display the numbers in fixed format with ten decimal digits

// Display on the screen, using 23 columns, the message
// "The original number is ", value
cout << "The original number is: " << value << endl;
// Format the output to display the numbers in fixed format with the number of decimal digits specified plus 2

// Display on the screen, using 23 columns, the message
// "The rounded number is ", valuero
cout<<fixed;
cout << "The rounded number is: " <<setprecision(decdig+2)<< valuero << endl;

system("pause");
return 0;
}

Kindly revert for any queries

Thanks.