public static void main(String[] args) {

int sum=0;

int num=2;

do {sum=sum+num;

? ? num=num+2;

}while(num<=50);

}

System.out.println("0到50以內的偶數的總和為："+sum);? //這一行提示有錯誤

}

錯誤信息是：

Multiple markers at this line

- Syntax error, insert ")" to complete MethodDeclaration

- Syntax error on token ".", @ expected after this token

- Syntax error, insert "SimpleName" to complete?

QualifiedName

- Syntax error, insert "Identifier (" to complete?

MethodHeaderName