atol
Convert ASCII string to long or long long integer
Interface
#include <stdlib.h>
| long | atol (const char *nptr) |
| long long | atoll (const char *nptr) |
#include <xlocale.h>
| long | atol_l (const char *nptr, locale_t loc) |
| long long | atoll_l (const char *nptr, locale_t loc) |
Description
The atol function converts the initial portion of the string pointed to by nptr to long integer representation. It is equivalent to:strtol(nptr, (char **)NULL, 10);The atoll function converts the initial portion of the string pointed to by nptr to long long integer representation. It is equivalent to:
strtoll(nptr, (char **)NULL, 10);While the atol and atoll functions use the current locale, the atol_l and atoll_l functions may be passed locales directly.
Example 1
#include <stdio.h> #include <stdlib.h> int main() { char x[20] = "2147111222"; long max = atol(x); printf("max = %ld\n", max); return 0; }
Output:max = 2147111222
Standards
The atol function conforms to ISO/IEC 9899:1990 ("ISO C90"). The atoll function conforms to ISO/IEC 9899:1999 ("ISO C99").Last Modified: 23 Feb 12 @ 09:00 Page Rendered: 2022-03-14 08:30:41