Question

How to use copysignl to combining long double and the sign of other long double in C

Answer 1

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

int main()
{
    printf("%Lf\n", copysignl(3000, +8.0));
    printf("%Lf\n\n", copysignl(-3000, +8.0));

    printf("%Lf\n", copysignl(425, -3.0));
    printf("%Lf\n\n", copysignl(-425, -3.0));

    printf("%Lf\n", copysignl(INFINITY, -9.0));
    printf("%Lf\n\n", copysignl(INFINITY, +9.0));

    printf("%Lf\n", copysignl(NAN, -5.0));
    printf("%Lf\n", copysignl(NAN, +5.0));

    return 0;
}




/*
run:

3000.000000
3000.000000

-425.000000
-425.000000

-inf
inf

-nan(ind)
nan

*/

 

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