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#include<iostream>
 
 
class date{
	private:
		int A;
		int B;
		int C;
 
	public:
		date(int,int);
 
		bool setA(int a){
			A = a;
			return true;
		};
 
		int getC(){
			return C;
		}
 
};
date(int a,int b):A(a),B(b),C(A+B);
 
 
int main(){
	date* hoge = new date(1,2);
 
	hoge->setA = 5;
 
	std::cout << hoge->getC() ;
	// なんで３なの！！！！！！！！！！！！
 
	return 0;
 
}

prog.cpp:23:6: error: expected unqualified-id before ‘int’
 date(int a,int b):A(a),B(b),C(A+B);
      ^~~
prog.cpp:23:6: error: expected ‘)’ before ‘int’
prog.cpp: In function ‘int main()’:
prog.cpp:29:8: error: invalid use of member function ‘bool date::setA(int)’ (did you forget the ‘()’ ?)
  hoge->setA = 5;
  ~~~~~~^~~~

Standard output is empty