import java.util.Scanner;
import java.io.File;
public class MarkHist {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print(“Enter filename: “);
String filename = scanner.nextLine();
System.out.print(“Enter min value: “);
int min = scanner.nextInt();
scanner.nextLine();
System.out.print(“Enter max value: “);
int max = scanner.nextInt();
scanner.nextLine();
System.out.print(“Enter bin width: “);
int width = scanner.nextInt();
scanner.nextLine();
int data[] = new int[max – min + 1];
int total = 0;
try (Scanner file = new Scanner(new File(filename))) {
// Skip the first line
file.nextLine();
while (file.hasNext()) {
String line[] = file.nextLine().split(“,”);
int d = Integer.parseInt(line[1]);
data[d – min] += 1;
total += 1;
}
} catch (Exception e) {
e.printStackTrace();
}
// Print out graph
for (int i = 0; i < data.length; i += width) {
int sum = 0;
// Bundle into *width* sized blocks
for (int j = 0; j < width && i + j < data.length; j++) {
sum += data[i + j];
}
int percentage = (int) (100 * (1.0 * sum) / total);
String bar = "";
if (percentage > 0) {
bar = String.format(“%” + percentage + “s”, ” “)
.replace(” “, “=”);
}
int lower = i + min;
int upper = lower + width – 1;
// Print the block
System.out.format(“%03d-%03d: %s\n”, lower, upper, bar);
}
}
}