Question

How to use lround() function to get the nearest integer from floating-point, halfway cases rounded away from zero in C

Answer 1

#include <stdio.h>     
#include <math.h> 
 
int main(int argc, char **argv)
{   
	printf("lround(3.2) = %ld\n", lround (3.2));
	printf("lround(3.3) = %ld\n", lround (3.3));
    printf("lround(3.5) = %ld\n", lround (3.5));
	printf("lround(3.6) = %ld\n", lround (3.6));
    printf("lround(3.7) = %ld\n\n", lround (3.7));
	
	printf("lround(4.2) = %ld\n", lround (4.2)); 	
	printf("lround(4.3) = %ld\n", lround (4.3));    
	printf("lround(4.5) = %ld\n", lround (4.5));    
    printf("lround(4.6) = %ld\n", lround (4.6));
    printf("lround(4.7) = %ld\n\n", lround (4.7));
	
    printf("lround(-3.2) = %ld\n", lround (-3.2));
    printf("lround(-3.3) = %ld\n", lround (-3.3));
    printf("lround(-3.5) = %ld\n", lround (-3.5));
    printf("lround(-3.6) = %ld\n", lround (-3.6));
    printf("lround(-3.7) = %ld\n\n", lround (-3.7));
	
    printf("lround(-4.2) = %ld\n", lround (-4.2));        
	printf("lround(-4.3) = %ld\n", lround (-4.3));    
	printf("lround(-4.5) = %ld\n", lround (-4.5));
	printf("lround(-4.6) = %ld\n", lround (-4.6));    
    printf("lround(-4.7) = %ld\n\n", lround (-4.7));
   
  
    return 0;
}
 
 
/*
run:
   
lround(3.2) = 3
lround(3.3) = 3
lround(3.5) = 4
lround(3.6) = 4
lround(3.7) = 4

lround(4.2) = 4
lround(4.3) = 4
lround(4.5) = 5
lround(4.6) = 5
lround(4.7) = 5

lround(-3.2) = -3
lround(-3.3) = -3
lround(-3.5) = -4
lround(-3.6) = -4
lround(-3.7) = -4

lround(-4.2) = -4
lround(-4.3) = -4
lround(-4.5) = -5
lround(-4.6) = -5
lround(-4.7) = -5

*/

 

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