i got complie time error in Apex Program?

- I read your requirements and implemented in my Org.Problem was that you did not create any method in the class. Please use the below code [Solved] : -

Class : - 
    public class IntegerAddition  {
        public static void AdditionMethod(){
            Integer a=3;
            Integer b=4;
            Integer c=a+b;
            System.debug('c  :'+c);
        }
    }