Question

Just getting started with C++, done a bit of C but one thing I don’t get is that you can’t substitute >> for =?

My code below:

char output[100];
if (myReadFile.is_open())
{
    for(int i=0; i != random_integer; i++)
    {
       if(i == random_integer-1){
        myReadFile >> output;
        printf("%s",output);
       }
    }
}
myReadFile.close();

I’d like to change myReadFile >> output to output = myReadFile but you can’t do that?

My second question is, I want to measure the length of the string that I assign to output, how can I do that without looping through the whole char array?

TIA

Answer 1

The reason you can’t use = instead of >> is because they’re two unrelated operators.

To solve the string-length issue, don’t use a raw char array. Use a std::string instead, because it manages its own memory internally:

std::string str;

myReadFile >> str;