8240. Function – 2

Implement a function f(x) = + 2 * x + sin(x).

Input. Each line contains one real number x.

Output. For each value x print in a separate line the value of the function f(x) with four digits after the decimal point.

Sample input	Sample output
2.234 10.23 56.1 23.2651	6.7507 22.9375 119.2562 50.3973

SOLUTION

functions

Algorithm analysis

Implement a function f(x). Read the input data till the end of file.

Algorithm realization

Implement a function f.

double f(double x)

{

return sqrt(x) + 2 * x + sin(x);

}

The main part of the program. Read the input data till the end of file.

while (scanf("%lf", &x) == 1)

printf("%.4lf\n", f(x));

Java realization

import java.util.*;

public class Main

{

static double f(double x)

{

return Math.sqrt(x) + 2 * x + Math.sin(x);

}

public static void main(String[] args)

{

Scanner con = new Scanner(System.in);

while(con.hasNext())

{

double x = con.nextDouble();

System.out.printf("%.4f\n",f(x));

}

con.close();

}

}

Python realization

import sys

import math

def f(x):

return math.sqrt(x) + 2 * x + math.sin(x)

for x in sys.stdin:

x = float(x)

print(f(x))