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import java.util.Scanner;
public class Lab4 {
// Densities in gr / cm3
public static final double ALUMINUM_DENSITY = 2.70; // Al
public static final double COPPER_DENSITY = 8.96; // Cu
public static final double GOLD_DENSITY = 19.3; // Au
public static final double IRON_DENSITY = 7.87; // Fe
public static final double SILVER_DENSITY = 10.5; // Ag
public static final double ERROR_TOLERANCE = 0.5;
public static void main(String[] args) {
metalTest("2472,43 1,0 100,0"); // Fe
metalTest("6192,0 2,0 8,0 20,0"); // Au
metalTest("288,9 3,0"); // Ag
metalTest("64,08 0,5 30"); // Al
metalTest("560,0 0,1 25,0 25,0"); // Cu
metalTest("999,0 4,0"); // Unknown
}
public static void metalTest(String input) {
Scanner console = new Scanner(input);
double mass = console.nextDouble();
double a = console.nextDouble();
double volume = cubeVolume(a);
if(console.hasNext()) {
double b = console.nextDouble();
volume = cylinderVolume(a, b);
if(console.hasNext()) {
double c = console.nextDouble();
volume = rectangularPrismVolume(a, b, c);
}
}
System.out.println("This metal is " + density2metal(mass/volume));
}
public static double cubeVolume(double x) {
return x * x * x;
}
public static double cylinderVolume(double r, double h) {
return Math.PI * r * r * h;
}
public static double rectangularPrismVolume(double x, double y, double z) {
return x * y * z;
}
public static String density2metal(double density) { String metal;
if (density <= ALUMINUM_DENSITY + ERROR_TOLERANCE && density >= ALUMINUM_DENSITY - ERROR_TOLERANCE) {
metal = "Aluminum";
} else if (density <= COPPER_DENSITY + ERROR_TOLERANCE && density >= COPPER_DENSITY - ERROR_TOLERANCE) {
metal = "Copper";
} else if (density <= GOLD_DENSITY + ERROR_TOLERANCE && density >= GOLD_DENSITY - ERROR_TOLERANCE) {
metal = "Gold";
} else if (density <= IRON_DENSITY + ERROR_TOLERANCE && density >= IRON_DENSITY - ERROR_TOLERANCE) {
metal = "Iron";
} else if (density <= SILVER_DENSITY + ERROR_TOLERANCE && density >= SILVER_DENSITY - ERROR_TOLERANCE) {
metal = "Silver";
} else {
metal = "Unknown";
}
return metal;
}
}
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