Question

The program is supposed to receive an input through cin, tokenize it, and then output each one to show me that it worked properly. It did not.

The program compiles with no errors, and takes an input, but fails to output anything.

What am I doing wrong?

int main(int argc, char* argv[])
{
  string input_line;

  while(std::cin >> input_line){
    char* pch = (char*)malloc( sizeof( char ) *(input_line.length() +1) );

    char *p = strtok(pch, " ");
    while (p != NULL) {
      printf ("Token: %s\n", p);
      p = strtok(NULL, " ");
    }
  }
  return 0;
}

I followed the code example here: http://www.cplusplus.com/reference/clibrary/cstring/strtok/

Thanks.

Answer 1

Looks like you forget to copy the contents of input_line to pch:

strcpy(pch, input_line.c_str());

But I’m not sure why you’re doing string tokenization anyway. Doing cin >> input_line will not read a line, but a token.. so you get tokens anyway?