How can I convert any numbers, for example 822042461 (string-type) to 822042461 (double-type)?

Question

How can I convert any numbers, for example 822042461 (string-type) to 822042461 (double-type) in C++ ?? Thanks a real lot !

Answer 1

sscanf may be useful:

/* sscanf example */
#include <stdio.h>

int main ()
{
  char sentence []="822042461";
  double i;

  sscanf (sentence,"%lf",&i);
  printf ("%lf\n",i);

  return 0;
}

$ gcc -o /tmp/test.exe  /tmp/test.cpp
$ /tmp/test.exe                      
822042461.000000