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 strtod()                Convert String to Double

 #include   <stdlib.h>

 double     strtod(sptr,endptr);
 const char *sptr;                       Pointer to string
 char       **endptr;                    Pointer to end of scan

    strtod() converts a string 'sptr' to a double value.  The string
    'sptr' is a sequence of characters that can be interpreted as a
    double value. The string must match this sequence:

        [whitespace] [sign] [digits] [.] [digits] [{e|E} [sign] digits]

    strtod() stops reading the string 'sptr' at the first character that
    cannot be recognized as part of a double value.  'endptr' points to
    the character that stopped the scan, which may be the null character
    that terminated the string.

       Returns:     The value of the floating-point number. In case of
                    overflow, it returns 'HUGE_VAL'.

   -------------------------------- Example ---------------------------------

    The following statements convert two strings into doubles, add them
    together, and print the total.

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

           double total;
           double dubl1, dubl2;
           char *str1 = "982.50 dollars", *str2 = "540.00 dollars";
           char *txt1, *txt2;

           main()
           {
           /* The space before "dollars" will stop the scanning of string. */
               dubl1 = strtod(str1,&txt1);
               dubl2 = strtod(str2,&txt2);
               total = dubl1 + dubl2;
               printf("TOTAL: %.2f ",total);
            }