FixedPoint

fp.c

// Online C compiler to run C program online
#include <stdio.h>
#include <stdint.h>

typedef	int64_t fixedpt;
#define FIXEDPT_BITS	32
#define FIXEDPT_WBITS	24
#define FIXEDPT_FBITS	(FIXEDPT_BITS - FIXEDPT_WBITS)
#define FIXEDPT_ONE	((fixedpt)((fixedpt)1 << FIXEDPT_FBITS))
#define fixedpt_rconst(R) ((fixedpt)((R) * FIXEDPT_ONE + ((R) >= 0 ? 0.5 : -0.5)))
int main() {
    fixedpt a = fixedpt_rconst(-4545.8);
    printf("%d\n", a);
    return 0;
}