Question

How to round up 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_UPWARD);

    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:

3
3
3
-2
-2
-2

*/

 

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