Thread: How i can solve this question? help me please ...

Write a Java program that will read the radius of a circle (radius in double) and compute the following using methods. The main program
should repeat until the user enters a negative value for the radius of the circle.

• Use a method to compute the area of circle using the formula
Area=3.14*r where 3.14 is a constant
• Use a method to computer the perimeter of the circle using the formula 2*3.14*r
where 3.14 is a constant

The program should use both method and display the two results for each radius that is input until a negative value for radius is input.


help me please...

i do not know who i can solve this question can you help me?

i know how i can write a java program but i am not understand how i can solve this question
i think i have to use scanner and loop an method but i am confusing because of the stress of the study .
can you help me?

ok, can you solve the question for me and i will understand it
sorry for this request but i have a lot of home works and i have to done a research and i have midterm and quize can you help me ?

hi, sorry i answer late,
i try to do the program but i have problem with the loop
mport java.util.Scanner;


public class a{
public static void main(String[] args){

Scanner scan=new Scanner(System.in);

double a,r,p;
for (double r=0; r<0; r++){

System.out.println("Enter value of radius:");
r=scan.nextDouble();

a=3.14*r ;
p=2*3.14*r;


System.out.println("Area= "+a);
System.out.println("Perimeter = "+p);
}
}
}

thanks for your reply ,
i see the link but i am still not able to solve this problem The program should use both method and display the two results for each radius that is input until a negative value for radius is input.



import java.util.Scanner;


public class a{
public static void main(String[] args){
for (double i = 0; i < 9; i++) {

Scanner scan=new Scanner(System.in);

double a,r,p;

System.out.println("Enter value of radius:");
r=scan.nextDouble();

a=3.14*r*r ;
p=2*3.14*r;

System.out.println("Area= "+a);
System.out.println("Perimeter = "+p);
}
}
}


i dont know how i can stop the program when i input negative number ?

i am still can not stop the program

import java.util.Scanner;


public class a{
public static void main(String[] args){
for (double i = 0; i < 9; i++) {
if (i<0)
System.exit(0);

Scanner scan=new Scanner(System.in);

double a,r,p;

System.out.println("Enter value of radius:");
r=scan.nextDouble();

a=3.14*r*r ;
p=2*3.14*r;

System.out.println("Area= "+a);
System.out.println("Perimeter = "+p);
}
}
}

i use this but am still have a problem

for (double i = 0; i < 9; i++) {
if (i<0)
System.out.println("print i");
else
System.exit(0);

i dont know can you help me ?
where is my mistake exactly?

sorry i am not have any idea ?
can you explain more?

import java.util.Scanner;
public class ty {
public static void main(String[] args){
Scanner input= new Scanner(System.in);
System.out.println("Enter a number");
int a=input.nextInt();
int c=3;
int b=3;
a=b+c;
System.out.println(a);

}
}

but am still have problem ?>

please can you solve the problem for me i have to end it before i sleep i have to submit it tomorrow ? the time with me now 11:47 pm

r the radius