Question

How to use floor() function to round N downward to the largest value that is not greater than N in C

Answer 1

#include <stdio.h>     
#include <math.h>
 
int main(int argc, char **argv)
{
	printf("floor(1.3) = %.1lf\n", floor(1.3));
	printf("floor(2.7) = %.1lf\n", floor(2.7));
	printf("floor(-4.2) = %.1lf\n", floor(-4.2));
	printf("floor(-2.8) = %.1lf\n", floor(-2.8));
	printf("floor(-0.0) = %+.1f\n", floor(-0.0));
	
    return 0;
}

/*
run:
  
floor(1.3) = 1.0
floor(2.7) = 2.0
floor(-4.2) = -5.0
floor(-2.8) = -3.0
floor(-0.0) = -0.0

*/

 

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