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Convert a string into a long integer
#include <stdlib.h>
long atol( const char* ptr );
long long atoll( const char* ptr );
- ptr
- A pointer to the string to parse.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The atol() function converts the string pointed to by
ptr to a long integer;
atoll() converts the string pointed to by
nptr to a long long integer.
- atol()
- A long integer.
- atoll()
- A long long integer.
#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
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
Yes |
Signal handler |
Yes |
Thread |
Yes |
atoi(),
itoa(),
ltoa(),
sscanf(),
strtol(),
strtoul(),
ultoa(),
utoa()
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