STL >> string >> the [] operator to find the n't

[smilitude]

I saw in the ref that there is something like this in <string>

reference operator[](size_type n) Random Access Container Returns the n'th character.

can you tell me how to use it,
i tried as following but it showed me compile error!

Code: Select all

#include <iostream>
#include <string>
#include <vector>
using namespace std;

int main() {
    vector<string> a;
    string input;
    int len;
    char ch;
   
    cin>>input;
    a.push_back(input);
    len = a.size();
    for(int i=0;i<len;i++) {
        ch = a[i];
        cout<<ch;
    }
    cout<<endl;
return 0;
}


[Krzysztof Duleba]

Hint: learn how to read compiler messages, this one should be fairly straightforward.

Hint 2: does that reference say anything about push_back method?

[smilitude]

thanks Krzysztof! I got it!
i was trying to do this in wrong way ...

Code: Select all

#include <iostream>
#include <string>
#include <vector>
using namespace std;

int main() {
    vector<string> a;
    string input;
    int len;
    char ch;
   
    cin>>input;
    a.push_back(input);
    len = a[0].size();
    for(int i=0;i<len;i++) {
        ch = a[0][i];
        cout<<ch;
    }
    cout<<endl;
    //system("pause");
return 0;
}



[Krzysztof Duleba]

Ouch, I thought you were pushing back to a string (which shouldn't work, so I didn't even bother to compile that code), but now I see you called push_back on a vector, which is perfectly valid.

I'm glad you were able to resolve it on your own.