The function first discards as many whitespace characters as necessary until the first non-whitespace character is found. Then, starting from this character, takes an optional initial plus or minus sign followed by as many numerical digits as possible, and interprets them as a numerical value.
The string can contain additional characters after those that form the integral number, which are ignored and have no effect on the behavior of this function.
If the first sequence of non-whitespace characters in str is not a valid integral number, or if no such sequence exists because either str is empty or it contains only whitespace characters, no conversion is performed.
- C string containing the representation of an integral number.
Return ValueOn success, the function returns the converted integral number as a long int value.
If no valid conversion could be performed, a zero value is returned.
If the correct value is out of the range of representable values, LONG_MAX or LONG_MIN is returned.
Enter a number: 567283 The value entered is 567283. The double is 1134566.
|atoi||Convert string to integer (function)|
|atof||Convert string to double (function)|
|strtol||Convert string to long integer (function)|