C++Primer Plus 第六版编程练习7.13-8(2)

//方案2
#include <iostream>
#include<vector>
#include <string>

using namespace std ;
const int Seasons = 4 ;
const string str1[Seasons] = {"Spring" ,"Summer","Fall","Winter"} ;

void fill(vector<int> &) ;
void show(vector<int>::iterator , vector<int>::iterator) ;

int main()
{
    vector<int> ivec ;
    fill(ivec) ;
    show(ivec.begin() , ivec.end()) ;
    return 0 ;
}

void fill(vector<int> &ivec1)    //这里要传引用,不然无法改变vector的值
{
    int temp ;
    for(int i =0 ;i< Seasons ;i++)
    {
        cout<<"Enter "<<str1[i] <<" expenses: ";
        cin>>temp  ;
        ivec1.push_back(temp) ;
    }
}

void show(vector<int>::iterator bn, vector<int>::iterator ed )
{
    double total = 0.0 ;
    cout<<"\nEXPENSES\n" ;
    int i =0 ;
    for(vector<int>::iterator iter = bn ;iter != ed ;iter++,i++)
    {
        cout<<str1[i]<<": $" <<(*iter)<<endl ;
        total += (*iter) ;
    }
    cout<<"Total Exoenses: $"<<total<<endl ;
}