I have to write a program that starts by requesting an integer in the range 0 < N < 20. Numbers outside this range are rejected and a new request is made. Output the sum of the sequence of numbers starting at 1 and ending with N. I have got most of the codes but I can not continuously ask users for inputs until an input meets the requirement. I tried to use "return" in line 11, however, it does not go back into the loop after getting another input. What should I do now?
import java.util.*;
class ExamTesterNine{
public static void main(String args[]){
Scanner kbReader= new Scanner(System.in);
int num=kbReader.nextInt();
System.out.println("Enter an integer smaller than 20 and larger than 0");
int result;
int sum=0;
if (!(num>0&&num<20)){
return;
}else{
for(int i=1; i<=num; i++)
sum=sum+i;
int [] number= new int [num];
for (int a=0; a<(number.length-1); a++ ){
number[a]=a+1;
System.out.print(number[a]+"+");}
System.out.print(num+"="+sum);
}
}
}
IT should be easy with do-while
. I am not on my compiler right now however this you should add in your code if you are using scanner
import java.util.*;
class ExamTesterNine{
public static void main(String args[]){
Scanner kbReader= new Scanner(System.in);
int num = 0;
System.out.println("Enter an integer smaller than 20 and larger than 0");
do{
num=kbReader.nextInt();
} while(num<0 && num <20);
int result;
int sum=0;
for(int i=1; i<=num; i++)
sum=sum+i;
int [] number= new int [num];
for (int a=0; a<(number.length-1); a++ ){
number[a]=a+1;
System.out.print(number[a]+"+");}
System.out.print(num+"="+sum);
}
}
}
Let me know if it don't I can get on the compiler quickly however do-while
is solution for you.