So I have an assignment in my CISP 1 class that requires me to create a program that displays a bar chart comprised of asterisks based on the amount of sales 5 different stores have had. I've got a base made, but I still want to add a loop that validates the input from the user(i.e. throws an error when the user tries to enter a negative number), and I want to add the option to run the program or exit it. I'm just a little lost on how to do all of that, so I figured I'd reach out on this website and ask. I know a lot of this code could be simplified with arrays, but we haven't started studying that yet - so I'm afraid to be messing with something I don't fully understand. Below is my code:
import java.util.Scanner;
public class BarChart
{
public static void main(String[] args)
{
int store1, store2, store3, store4, store5;
Scanner keyboard = new Scanner(System.in);
System.out.println("This program will display a bar chart "
" comprised of astericks based on five different stores' "
"sales. 1 asterick = $100 in sales.");
System.out.print("Enter today's sales for store 1: ");
store1 = keyboard.nextInt();
System.out.print("Enter today's sales for store 2: ");
store2 = keyboard.nextInt();
System.out.print("Enter today's sales for store 3: ");
store3 = keyboard.nextInt();
System.out.print("Enter today's sales for store 4: ");
store4 = keyboard.nextInt();
System.out.print("Enter today's sales for store 5: ");
store5 = keyboard.nextInt();
System.out.println("Sales \t Bar Chart");
System.out.println("----- \t ---------");
System.out.print("\nStore 1: ");
for (int num = 0; num < store1; num = 100)
{
System.out.print("*");
}
System.out.print("\nStore 2: ");
for (int num = 0; num < store2; num = 100)
{
System.out.print("*");
}
System.out.print("\nStore 3: ");
for (int num = 0; num < store3; num = 100)
{
System.out.print("*");
}
System.out.print("\nStore 4: ");
for (int num = 0; num < store4; num = 100)
{
System.out.print("*");
}
System.out.print("\nStore 5: ");
for (int num = 0; num < store5; num = 100)
{
System.out.print("*");
}
}
}
I've tried adding if statements each time the user is asked to enter a sales amount, but that didn't work.
CodePudding user response：
while (true) {
Scanner keyboard = new Scanner(System.in);
<Do something...>
if (condition) {
break;
}
}
CodePudding user response：
You have to put if or while condition after reads store. If entered store < 0, You get suggestion message "Please enter positive number". You can reduce so much boilerplate code using array.
Here down is code:
import java.util.Scanner;
public class BarChart
{
static void message()
{
System.out.println("Please enter positive number");
}
public static void main(String[] args)
{
int store1, store2, store3, store4, store5;
Scanner keyboard = new Scanner(System.in);
System.out.println("This program will display a bar chart "
" comprised of astericks based on five different stores' "
"sales. 1 asterick = $100 in sales.");
System.out.print("Enter today's sales for store 1: ");
store1 = keyboard.nextInt();
if(store1 < 0)
{
message();
store1 = keyboard.nextInt();
}
System.out.print("Enter today's sales for store 2: ");
store2 = keyboard.nextInt();
if(store2 < 0)
{
message();
store2 = keyboard.nextInt();
}
System.out.print("Enter today's sales for store 3: ");
store3 = keyboard.nextInt();
if(store3 < 0)
{
message();
store3 = keyboard.nextInt();
}
System.out.print("Enter today's sales for store 4: ");
store4 = keyboard.nextInt();
if(store4 < 0)
{
message();
store4 = keyboard.nextInt();
}
System.out.print("Enter today's sales for store 5: ");
store5 = keyboard.nextInt();
if(store5 < 0)
{
message();
store5 = keyboard.nextInt();
}
System.out.println("Sales \t Bar Chart");
System.out.println("----- \t ---------");
System.out.print("\nStore 1: ");
for (int num = 0; num < store1; num = 100)
{
System.out.print("*");
}
System.out.print("\nStore 2: ");
for (int num = 0; num < store2; num = 100)
{
System.out.print("*");
}
System.out.print("\nStore 3: ");
for (int num = 0; num < store3; num = 100)
{
System.out.print("*");
}
System.out.print("\nStore 4: ");
for (int num = 0; num < store4; num = 100)
{
System.out.print("*");
}
System.out.print("\nStore 5: ");
for (int num = 0; num < store5; num = 100)
{
System.out.print("*");
}
}
}
You can reduce so much boilerplate code using array
import java.util.Scanner;
public class BarChart
{
static void message()
{
System.out.println("Please enter positive number");
}
public static void main(String[] args)
{
int store[] = new int[5];
Scanner keyboard = new Scanner(System.in);
System.out.println("This program will display a bar chart "
" comprised of astericks based on five different stores' "
"sales. 1 asterick = $100 in sales.");
for (int i = 0; i < store.length; i )
{
System.out.print("Enter today's sales for store " (i 1) ": ");
store[i] = keyboard.nextInt();
if(store[i] < 0)
{
message();
store[i] = keyboard.nextInt();
}
System.out.print("*");
}
System.out.println("Sales \t Bar Chart");
System.out.println("----- \t ---------");
for (int i = 0; i < store.length; i )
{
System.out.print("\nStore " (i 1) ":");
for (int num = 0; num < store[i]; num = 100)
{
System.out.print(" *");
}
}
}
}