c++——vector

 1 #include <iostream>
 2 #include <vector>
 3 using namespace std;
 4 
 5 int main(){
 6 vector<int> v{1,2,3,4,5};
 7 for(auto &i:v)
 8     i*=i;
 9 for(auto i:v)
10     cout<<i<<" ";
11 cout<<endl;
12 }

 1 #include <iostream>
 2 #include <vector>
 3 using namespace std;
 4 
 5 int main(){
 6 vector<unsigned> scores(11,0);
 7 unsigned grade;
 8 while(cin >> grade){
 9     if(grade <= 100)
10         ++scores[grade/10];
11 }
12 for(auto i:scores)
13     cout<<i<<" ";
14 cout<<endl;
15 }

1 int main(){
2 vector<int> v;
3 cout << v[0];
4 }

 1 #include <iostream>
 2 #include <vector>
 3 #include <string>
 4 using namespace std;
 5 
 6 int main(){
 7 string s("some thing");
 8 if(s.begin() != s.end()){
 9     auto it = s.begin();
10     *it = toupper(*it);
11 }
12 cout<<s<<endl;
13 }

 1 #include <iostream>
 2 #include <vector>
 3 #include <string>
 4 using namespace std;
 5 
 6 int main(){
 7 string s = "some thing";
 8 for(auto it = s.begin(); it != s.end() && !isspace(*it); ++it)
 9     *it = toupper(*it);
10 cout << s << endl;
11 }