atof()

Convert a string into a double

Synopsis:

#include <stdlib.h>

double atof( const char* ptr );

Arguments:

ptr

A pointer to the string to parse.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The atof() function converts the string pointed to by ptr to a double. Calling it is equivalent to calling strtod() like this:

strtod( ptr, (char**)NULL )

Returns:

The converted double, or 0.0 if an error occurs.

Errors:

If an error occurs, errno is set to ERANGE.

Examples:

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

int main( void )
{
    double x;

    x = atof( "3.1415926" );
    printf( "x = %f\n", x );
    return EXIT_SUCCESS;
}

Classification:

ANSI, POSIX 1003.1

See also:

errno, sscanf(), strtod()