指针作为函数形参

typedef int(*Operator)(int, int);

int Sum(int a, int b)

{

return a + b;

}

int Sub(int a, int b)

{

return a>b?(a-b):(b-a);

}

int Mul(int a, int b)

{

return a * b;

}

int Div(int a, int b)

{

return a / b;

}

int EasyCalc(Operator pFun ,int a,int b)

{

return pFun(a,b);

}