Help for this error ^_^

Question

Someone help please, i can;t get this correct ^_^
public class Circle{
public static void main(String args[]){
int radius = 2;
int diameter = 4;
float area;
area = 3.142*(radius*radius);
System.out.println("Radius = "+ radius);
System.out.println("Diamater = "+ diameter);
System.out.println("Area = " + area);
error i get
C:\javady>javac Circle.java
Circle.java:7: possible loss of precision
found : double
required: float
area = 3.142*(radius*radius);
______^ (Its point at 3)
1 error

Answer 1

Thank you and i done it ^_^ there is another one i can;t slove it. The selection for shoe type.
import java.io.*;
public class shoe{
public static void main (String args[]) throws IOException{
char shoe;
BufferedReader temp = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Choose type of shoe:");
String tempShoe = temp.readLine();
shoe = Character.parseChar(tempShoe);
String price = "";
if (shoe == 'S')
price = "RM100";
else
if (shoe == 'H')
price = "RM80";
else
if (shoe == 'B')
price = "RM50";
else
price = "Invalid";
System.out.println("The price for the shoe chosen is " + price);
error i get
C:\javady>javac shoe.java
shoe.java:9: cannot resolve symbol
symbol : method parseChar (java.lang.String)
location: class java.lang.Character
shoe = Character.parseChar(tempShoe);
_____________^ (its point at the dot)
1 error