solved error

fx_s2308_double.h

 #pragma once
 typedef double fx_s2308;
 #define fx_to_double(a) ((double) a/ (256.0))
-#define double_to_fix(a) ((double) a/ (256.0))
+#define double_to_fx(a) ((int) (a* 256.0))
 #define fx_add(a,b) (a+b)
 #define fx_sub(a,b) (a-b)
-#define fx_mul(a,b) (double_to_fx(fx_to_double(a)*fx_to_double(b)))
-#define fx_div (a,b) (double_to_fx(fx_to_double(a)/fx_to_double(b)))
+#define fx_mul(a,b) double_to_fx((fx_to_double(a)*fx_to_double(b)))
+#define fx_div(a,b) double_to_fx((fx_to_double(a)/fx_to_double(b)))
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test.c

@@ -5,7 +5,7 @@ typedef double fx_s2308;
 int main() {
 	fx_s2308 a = 200;
 	fx_s2308 b = 100;
-	fx_s2308 output = fx_add(a, b);
+	fx_s2308 output = fx_mul(a, b);
 	printf("%lf",output);
 	return 0;
 }
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