Utility Functions and C Language Reference > C Language Reference > Alphabetical List of Functions > atol


Example: atol Data Type Conversion Functions

Converts a string to a long integer value.

long atol( const char *string);

string The string to convert.

atol reads the initial portion of the string only, by stopping at the first non-numerical character.

Return Values

The converted long integer value of the input string. On overflow the result is undefined. If an error occurs, returns 0.