2-7.cpp

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#include<iostream.h>
void main()
{
  float price,total,money,rest;
  int n;
  cout<<"商品单价:";
  cin>>price;
  cout<<"商品数量:";
  cin>>n;
  total=price*n;
  cout<<"金额小计:"<<total<<endl;
  cout<<"输入钱数:";
  cin>>money;
  rest=money-total;
  cout<<"找零:"<<rest<<endl;
}