C
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trunc

trunc, truncf, truncl

Defined in header <math.h> 
float       truncf( float arg );
 (1) (since C99) 
double      trunc( double arg );
 (2) (since C99) 
long double truncl( long double arg );
 (3) (since C99)
Defined in header <tgmath.h> 
#define trunc( arg )
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