Question

I have a vector string :

vector <string> name[20][100];

I want to input to name[0][0], but getline is not working. My code :

cin.getline(name[0][0], sizeof(name[0][0]))

How to fix it?

Answer 1

Your first problem is that you are declaring a three-dimensional structure. I suspect you intended only two levels. The next problem is that you are using std::basic_istream<…>::getline, which relies on you preparing buffer space in advance (which you are not doing). The free-function form, std::getline, is easier and safer:

std::string name[20][100];
for (int i = 0; i < 20; ++i)
    for (int j = 0; j < 100; ++j)
        getline(std::cin, name[i][j]);