Question

请问这个哪里错了

#include <stdio.h>
int main()
{
int n;
int remainder;
printf("请输入要分解的数:");
scanf("%d",&n);
while(n! =0)
{
remainder=n%10;
printf("%d",remainder);
n=n/10;
}
return 0;
}

Answer 1

#include<iostream>//c++没有后缀.h using namespace std;//没有引用这句话，肯定报错 class Currency { public: void set(double j,double e) { Japan=j; Europe=e; } virtual void print_exchange()=0; protected: double Japan,Europe; }; class Ja:public Currency { public: void print_exchange() { double t; t=10000/Japan; cout<<t<<endl; } }; class Eur:public Currency { public: void print_exchange() { double t; t=100*Europe; cout<<t<<endl; } }; void fun(Currency *ptr) { ptr->print_exchange(); } void main() { Currency *p=NULL;//最好加上初始化 // p->set(116.30,1.1634);不能对悬挂指针进行赋值 Ja ja; Eur eur; ja.set(116.30,1.1634); p=&ja;//见下 fun(p); eur.set(116.30,1.1634); p=&eur;//将地址赋给指针不用p->&eur，用等号 fun(p); }