log, log10 (Windows CE 5.0)
Developing an Application > Microsoft C Run-time Library for Windows CE > Run-time Library Reference
Calculates logarithms.
double log( doublex);double log10( doublex );
Parameters
- x
Value whose logarithm is to be found.
Return Values
The log functions return the logarithm of x if successful.
If x is negative, these functions return an indefinite (same as a quiet NaN).
If x is 0, they return INF (infinite).
Example
/* LOG.C: This program uses log and log10
* to calculate the natural logarithm and
* the base-10 logarithm of 9,000.
*/
void main( void )
{
double x = 9000.0;
double y;
y = log( x );
printf( "log( %.2f ) = %f\n", x, y );
y = log10( x );
printf( "log10( %.2f ) = %f\n", x, y );
}
Output
log( 9000.00 ) = 9.104980
log10( 9000.00 ) = 3.954243
Requirements
OS Versions: Windows CE 2.0 and later.
Header: stdlib.h.
Link Library: coredll.dll.
See Also
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