Question

How to round long double to the nearest integer in C

Answer 1

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

int main()
{
    long double x = 4.311, y = 6.500, z = 9.811;

    printf("%Lf\n", nearbyintl(x));
    printf("%Lf\n", nearbyintl(y));
    printf("%Lf\n", nearbyintl(z));

    x = -4.311, y = -6.500, z = -9.811;

    printf("%Lf\n", nearbyintl(x));
    printf("%Lf\n", nearbyintl(y));
    printf("%Lf\n", nearbyintl(z));

    return 0;
}




/*
run:

4.000000
6.000000
10.000000
-4.000000
-6.000000
-10.000000

*/

 

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