c++作业-10

10-9

#include<bits/stdc++.h>
using namespace std;
vector<int> a,b,c;
int main(){
    int i;
    for (i=1;i<=10;i++) a.push_back(i);
    for (i=1;i<=10;i++) b.push_back(i);
    for (i=1;i<=10;i++) c.push_back(i);
    swap(a[0],a[1]);
    printf("swap(a[1],a[2])
");
    for (i=0;i<a.size();i++) printf("%d ",a[i]);
    printf("
");
    iter_swap(b.begin(),b.begin()+1);
    printf("iter_swap(b.begin(),b.begin()+1)
");
    for (i=0;i<a.size();i++) printf("%d ",b[i]);
    printf("
");
    swap_ranges(c.begin(),c.begin()+2,c.begin()+5);  
    printf("swap_ranges(c.begin(),c.begin()+2,c.begin()+5)
");
    for (i=0;i<a.size();i++) printf("%d ",c[i]);
    printf("
");
} 

通过比较可以发现，swap和iter_swap都是交换两个元素，只不过这两者的参数不同。swap的参数为两个需要交换的元素。而iter_swap为元素的两个迭代器。而swap_ranges的作用是指定长度的整段交换。

12.4

#include<bits/stdc++.h>
using namespace std;
class Exception{
    public :
        Exception (const string &message):message(message){
        }
        const string &getmessage() const {return message;}
        string message;
};
class OutOfMemory:public Exception{
    public :
        OutOfMemory(int k):Exception("Memory Limit Exceeded"){
              size=k;pan();
        }
        void pan()throw (Exception){
            if (size>5) throw(*this);
        }
        int size;
};
class RangeError:public Exception{
    public :
        RangeError (int k):Exception("Range Error"){
            sum=k;pan();
        }
        void pan()throw (Exception){
            if (sum>100||sum<0) throw(*this);
        }
        int sum;
};
int main(){
    int n,x,i;
    while(cin>>n){
        try{
            OutOfMemory tt(n);
            for (i=1;i<=n;i++) {
                cin>>x;
                RangeError ff(x);
            }
        }
        catch (Exception& e){
            cout<<e.getmessage()<<endl;
        }
    }
} 

限定内存大小为5个int，元素大小为0~100