如果没有,则出错

Question

我不知道我是否正确使用了conditinal语句(if和else).它说Kuiz.java:29:错误:'else'没有'if'和第40行相同

    System.out.println("Fillojme me kuizin");
    System.out.println();
    System.out.println("P1) Cili eshte kryeqyteti i Frances? \t\n 1)Londra \t\n 2)Parisi \t\n 3)Roma");
    int a = scan.Int();

    if(a == 1)
        {
            System.out.println("E sakte! ");
        }
    else 
        {
            System.out.println("E pasakte, Parisi eshte pergjigja e sakte");
        }

    System.out.println("P2)A mund te ruajme vleren \"dera\" ne nje variabel te tipit int? \t\n 1)Po \t\n 2)Jo");
    int b = scan.nextInt();
    if(b == 2 );
        {
            System.out.println("E Sakte!");
        }
    else
        {
            System.out.println("E pasakte, dera eshte nje String kurse ne variabel mund te ruajme vetem numra te plote");
        }

    System.out.println("P3)Cili eshte rezultati i 6+9/3 \t\n 1)5 \t\n 2)5 \t\n 3)15/3");
    int c = scan.nextInt();
    if(c == 2);
        {
            System.out.println("E sakte!");
        }
    else    
        {
            System.out.println("Pergjigja e pasakte");

        }
}

}

Answer 1

您需要在if条件之后删除分号.

语法是

if (condition)
{
  do something
} else {
  do something else
}

如果你添加一个分号,那就意味着

if (condition)
    ;  // i.e. do nothing

{
  do something // this is divorced from the if statement
}

else // this is an error because it's not linked with an if statement