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class Ideone
{
    public static void main (String[] args)
    {
        int num1 = 100;
        int num2 = 10;
        System.out.println("num1 + num2 = " + num1 + num2);
        System.out.println("num1 - num2 = " + num1 - num2);
        System.out.println("num1 * num2 = " + num1 * num2);
        System.out.println("num1 / num2 = " + num1 / num2);
        System.out.println("num1 % num2 = " + num1 % num2);
    }
}

Main.java:8: error: bad operand types for binary operator '-'
        System.out.println("num1 - num2 = " + num1 - num2);
                                                   ^
  first type:  String
  second type: int
1 error

Standard output is empty