atol() — Convert character string to long
Standards
| Standards / Extensions | C or C++ | Dependencies |
|---|---|---|
ISO C
POSIX.1 XPG4 XPG4.2 C99 Single UNIX Specification, Version 3 |
both |
Format
#include <stdlib.h>
long int atol(const char *nptr);General description
The atol() function
converts the initial portion of the string pointed to by nptr to
a 'long int'. This is equivalent to
strtol(nptr, (char**)NULL, 10)Returned value
The atol() function returns the converted value if the value can be represented, otherwise the return value is undefined.
Related information
- stdlib.h — Standard library functions
- atof() — Convert character string to double
- atoi() — Convert character string to integer
- fscanf(), scanf(), sscanf() — Read and format data
- strtod() — Convert character string to double
- strtol() — Convert character string to long
- strtoul() — Convert string to unsigned integer