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

prog.cpp:23:28: error: return type specification for constructor invalid
 void date::date(int a,int b):A(a),B(b),C(a+b){}
                            ^
prog.cpp: In function ‘int main()’:
prog.cpp:27:19: error: expected type-specifier before ‘hoge’
  date* hoge = new hoge(1,2);
                   ^~~~

Standard output is empty