c++的局部变量怎么定义或者初始化

#include
#include<math.h>
using namespace std;
template
class A {
T a, b, S;
public:
A(T a1, T a2) :a(a1), b(a2) {}
T set() {
S = a / b;
return S;
}
};
int main() {
int a, b;
try {
if (b == 0) throw 0;
cout << a / b << endl;
}
catch (int) {
cout << "你错了" << endl;
return -1;
};
A mya(2, 1);
cout << mya.set() << endl;
Amyb(2, 0);
cout << myb.set() << endl;
return 0;
}
这是允许说是要初始化的代码，该怎么解决

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