#include <stdio.h>
#include <math.h>
#include <stdlib.h>
void main( void )
{
int ix = -4, iy;
long lx = -41567L, ly;
double dx = -3.141593, dy;
iy = abs( ix );
printf( "The absolute value of %d is %d\n", ix, iy);
ly = labs( lx );
printf( "The absolute value of %ld is %ld\n", lx, ly);
dy = fabs( dx );
printf( "The absolute value of %f is %f\n", dx, dy );
}
下个msdn吧 可以自己查