java如何调用scanDouble()方法?
我试图在main()中调用scanDouble()方法,但失败了好几次
import java.util.Scanner;
public class validateInput {
public static void scanDouble(Scanner in){
System.out.print("Enter a number: ");
if(!in.hasNextDouble()){
String word = in.next();
System.err.println(word + "is not a number");
return;
}
double x = in.nextDouble();
printLogarithm(x);
}
public static void printLogarithm(double x) {
if (x < 0.0) {
System.err.println("Error: x must be positive.");
return;
}
double result = Math.log(x);
System.out.println("The log of x is " + result);
}
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
double x = in.nextDouble();
scanDouble(x);
}
}
error info:validateInput.java:26:error:incompatible type: double cannot convert to Scanner scanDouble(x);
# 1 楼答案
必须将扫描仪作为参数传递
您向该方法传递了一个双精度值