#include<iostream>
#include<string>
#include<vector>
using namespace std;
int main()
{
vector<string> str={"The is C++ program ","hfh ","","hfdshfisoid"};
for(auto it=str.begin();it!=str.end()&&!it->empty();++it)
{
cout<<*it<<endl;
for(auto st=(*it).begin();st!=(*it).end();++st)
{
*st=toupper(*st);
}
cout<<*it<<endl;
} return ;
}
运行结果: