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These functions perform conversions between objects of various types and
strings.  The following functions are defined:

atof
    string to double

atoi
    string to int

atol
    string to long int

ecvt
    double to E-format string

fcvt
    double to F-format string

gcvt
    double to string

itoa
    int to string

ltoa
    long int to string

strtod
    string to double

strtol
    string to long int

strtoul
    string to unsigned long int

ultoa
    unsigned long int to string

utoa
    unsigned int to string

See also  tolower,  toupper,  strlwr, and  strupr which convert the cases of
characters and strings.