Cpp - Write program to calculate the square roots of the numbers

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Requirements

Create a program to calculate the square roots of the numbers 

4      12.25       0.0121

and output them.

Then read a number from the keyboard and output the square root of this number.

Hint

To calculate the square root, use the function sqrt(), which is defined by the following prototype in the math.h (or cmath ) header file: 

double sqrt( double x);

The return value of the sqrt() function is the square root of x.

Demo

#include <iostream> 
#include <cmath> 
using namespace std; 

int main() //from   w ww  .  ja  va  2 s .c o  m
{ 
   double x1 = 4.0, x2 = 12.25, x3 = 0.0121; 

   cout << "\n   Number  \t Square Root" << endl; 
   cout << "\n    " << x1 << "   \t " << sqrt(x1) 
        << "\n   "  << x2 << "   \t " << sqrt(x2) 
        << "\n    " << x3 << "   \t " << sqrt(x3) << endl; 

   cout << "\nType a number whose square root is to be" 
                                       " computed. "; 
   cin  >> x1; 

   cout << "\n   Number  \t Square Root" << endl; 
   cout << "\n   " << x1 << "  \t " << sqrt(x1) << endl; 

   return 0; 
}

Result