So I'm currently a beginner programmer trying to slove some basic programming tasks. But I dont understand why My code is wrong. In eclipse everyting works. It's a coding problem from codewars.com
Introduction: You ask a small girl,"How old are you?" She always says, "x years old", where x is a random number between 0 and 9.
Write a program that returns the girl's age (0-9) as an integer.
Assume the test input string is always a valid string. For example, the test input may be "1 year old" or "5 years old". The first character in the string is always a number.
package headfirstjava;
import java.util.Random;
public class do_something5 {
public static void main(String[] args) {
// TODO Auto-generated method stub
{
int min =1;
int max =9;
int age1 = (int)Math.round(Math.random() * (max - min) min);
int age2 = (int)Math.round(Math.random() * (max - min 1) min);
System.out.println("I'm " age1 " Old");
}
}
}
CodePudding user response:
I think you didn't understand the problem asked. Here the input of the program is the string "x years old" and you have to return "x" as an integer :
return Integer.parseInt(input.substr(0,1))
CodePudding user response:
I am not sure what the problem is. Try this if the problem is with generating random number:
// create random object
Random ran = new Random();
// Print next int value
// Returns number between 0-9
int nxt = ran.nextInt(10);
// Printing the random number
// between 0 and 9
System.out.println
("Random number between 0 and 9 is : " nxt);
Also check out Random class in java! (Sry if this doesn't help)
CodePudding user response:
If you simply want to extract a number from a specific string format (means you know where the number you are looking for is) use the Character.getNumericValue(string.charAt(0)) method.
Scanner scanner = new Scanner(System.in)
System.out.println("How old are you?");
String s= scanner.nextLine();
char c=s.charAt(0);
System.out.println("1st character is: " Character.getNumericValue(c) );
This is the simplest form that you can go. I suggest you go through w3schools.com for the basics.