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| #define OPTION 1 // 1, 2, 3, 4, 5 | |
| typedef long res_t; // long, float | |
| #if OPTION == 1 | |
| // use Arduino.h's `round` | |
| #elif OPTION == 2 | |
| // use template function returning long | |
| template<typename T> long Round(T x) { return x>=0 ? x+0.5 : x-0.5; } | |
| #undef round | |
| #define round(x) Round(x) | |
| #elif OPTION == 3 | |
| // use template function returning T | |
| template<typename T> T Round(T x) { return x>=0 ? (long)(x+0.5) : (long)(x-0.5); } | |
| #undef round | |
| #define round(x) Round(x) | |
| #elif OPTION == 4 | |
| // use math.h round | |
| #undef round | |
| #elif OPTION == 5 | |
| // use math.h lround | |
| #undef round | |
| #define round(x) lround(x) | |
| #endif | |
| void setup() { | |
| Serial.begin(9600); | |
| float x = Serial.read(); | |
| res_t y = round(x/2); | |
| Serial.println(y); | |
| } | |
| void loop() { } |
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