总是在c ++计算脚本中返回466750944

always returning 466750944 in c++ calculations script

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#include <iostream>
using namespace std;
multiplication() {
int x;
int y;
int sum;
sum = y * x;

cout <<"multiplication" << endl;
cout <<"enter first number for multiplication:";
cin >> x;
cout <<"enter second number for multiplication:";
cin >> y;
cout <<"your product is:" << sum <<endl;
return 0;
}
void division (){
cout <<"division" << endl;

}
void addition (){
int y;
int x;
int sum = x * y;
cin >> x;
cin >> y;
cout << sum;
}
void subtraction (){

}

int main()
{cout <<"enter 1 for multiplication, enter 2 for division, enter 3 for addition, and enter 4 for subtraction"<<endl;
int math;
cin >> math;
switch(math){

case 1:
multiplication();
break;
case 2:
division();

default:
cout <<"it dont work ooga booga"<<endl;
break;
case 3:
addition ();
break;
case 4:
subtraction();}
return 0;
}

这是我正在尝试运行的脚本，我在code：：blocks中运行。如果有什么错误会导致它始终返回466750944，请告诉我，以便我可以在这方面做更多的工作。这可能是我在codeblocks中的一个问题，如果有人也可以在codeblocks或另一个IDE中运行此脚本并发布其结果，这将是非常感谢的，thaNK优