atol(), atoll()

Convert a string to a long integer

Synopsis:

#include <stdlib.h>

long atol( const char* ptr );

int64_t atoll( const char* nptr );

Library:

libc

Description:

The atol() function converts the string pointed to by ptr to a long integer; atoll() converts the string pointed to by nptr to an int64_t (long long) integer.

Returns:

atol(): A long integer.
atoll(): An int64_t integer.

Examples:

#include <stdlib.h>
#include <stdio.h>

int main( void )
{
    long x;

    x = atol( "-289" );
    printf( "x = %d\n", x );
    return EXIT_SUCCESS;
}

produces the output:

x = -289

Classification:

atol() is ANSI; atoll() is Unix

Safety:
Cancellation point	No
Interrupt handler	Yes
Signal handler	Yes
Thread	Yes