package circleinfo;
import java.util.Scanner;
public class Circleinfo {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
int r;
System.out.print("Enter the radius of the circle to find circumference, diameter, and area\n");
r = input.nextInt();
System.out.printf("The circumference is %f\n",(2*r*Math.PI));
System.out.printf("The diameter is %f\n",(r*2));
System.out.printf("The area is %f\n",(r*r*Math.PI));
}
}
- 這就是它的樣子。它計算周長,但不是其餘。我在做什麼錯? Java IllegalFormatConversionException
Enter the radius of the circle to find circumference, diameter, and area
10
The circumference is 62.831853
Exception in thread "main" java.util.IllegalFormatConversionException: f != java.lang.Integer
at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4045)
at java.util.Formatter$FormatSpecifier.printFloat(Formatter.java:2761)
at java.util.Formatter$FormatSpecifier.print(Formatter.java:2708)
at java.util.Formatter.format(Formatter.java:2488)
at java.io.PrintStream.format(PrintStream.java:970)
at java.io.PrintStream.printf(PrintStream.java:871)
at circleinfo.Circleinfo.main(Circleinfo.java:30)
直徑爲Java結果:1
'System.out.printf( 「直徑%F \ n」 ,(r * 2));'在那裏'r * 2'是一個整數,但你像打一個浮點數一樣調用printf。在那裏使用'%d'而不是'%f'。 –