double atof (
const char *s
)
|
Arguments
| s |
Pointer to a character string |
Return Value
The result of converting the input string pointed to by s to a double-precision value is returned. If the value exceeds the range that can be expressed, either +HUGE_VAL(1.797693134862316e+308) or -HUGE_VAL is returned according to the sign. 0 is returned if an underflow occurs.
Explanation
The character string pointed to by s which represents a floating point number, is converted to a double-precision floating point value.
Notes
Error processing is shown in the following table:
|
Condition
|
Return value
|
Error
|
| Outside the range that can be expressed |
+/- HUGE_VAL
|
Domain error
|
|
Underflow
|
0
|
Domain error
|
See Also
strtod()
|