Question

How to use fegetround () function to indicate the rounding direction mode in C

Answer 1

#include <stdio.h>     
#include <math.h>      
#include <fenv.h>

int main(int argc, char **argv)
{
	printf ("rounding: ");
	switch (fegetround()) {
		case FE_DOWNWARD: printf("downward\n"); break;
		case FE_TONEAREST: printf("to-nearest\n"); break;
		case FE_TOWARDZERO: printf("toward-zero\n"); break;
		case FE_UPWARD: printf("upward\n"); break;
		default: printf("unknown\n");
	}
	
	printf("rint(3.4) = %.1f\n", rint(3.4) );
	printf("rint(4.7) = %.1f\n", rint(4.7) );
	printf("rint(-3.4) = %.1f\n", rint(-3.4) );
	printf("rint(-4.7) = %.1f\n", rint(-4.7) );
	
	return 0;
}

/*
run:

rounding: to-nearest
rint(3.4) = 3.0
rint(4.7) = 5.0
rint(-3.4) = -3.0
rint(-4.7) = -5.0

*/
/*
run:

rounding: to-nearest
rint(3.4) = 3.0
rint(4.7) = 5.0
rint(-3.4) = -3.0
rint(-4.7) = -5.0

*/ 

 

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