Function that reads a double of a string and returns the rest of the string in C

Question

Is there any function of the type? Which reads and stores or returns a double of a string and returns or pointers the rest of the string or do I have to do my own function? If there is no one have ideas on how to do this function optimally?

Answer 1

There is the function:

double strtod (const char* str, char** endptr);

She converts a number double from the string passed as the first parameter, and plays in the second parameter a pointer to the rest of the string. Example:

#include <stdio.h> 
#include <stdlib.h>  

int main ()
{
  char texto[] = "1.21 gigawatts";
  char* resto;
  double num;
  num = strtod (texto, &resto);
  printf ("Num: %f\n", num);
  printf ("Resto: %s\n", resto);
  return 0;
}

Exit:

Num: 1.210000
Resto:  gigawatts