Question

How to round down a double value to an integral value (long int) in C

Answer 1

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

int main(void) {

    fesetround(FE_DOWNWARD);

    printf("%ld\n", lrint(2.4));
    printf("%ld\n", lrint(2.5));
    printf("%ld\n", lrint(2.6));

    printf("%ld\n", lrint(-2.4));
    printf("%ld\n", lrint(-2.5));
    printf("%ld\n", lrint(-2.6));
}



/*
run:

2
2
2
-3
-3
-3

*/

 

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