atol (programming)

The atol function in C programming language and C++ converts a string of a numerical representation into a long integer. When used, the function is included from the stdlib.h header.

The atol function has a prototype as follows:

long atol (const char *string)

Where string is the string, represented by an array of characters, terminated or intercepted by any non-numerical character, to be converted to the integer. The required integer is returned.