Procent forhold mellem 2 tal

C++ kode 

 #include <iostream>
 
 double percent(double value, double upper, double lower) {
     return (value - lower) / (upper - lower) * 100.0;
 }
 
 int main(int argc, char const *argv[]) {
     double current = 12.7;
 
     std::cout << "Current: " << current << "V = " << percent(current, 13.8, 11.5) << "%" << std::endl;
     return 0;
 }

Kode 

double percent = (value - lower) / (upper - lower) * 100.0;

C++ kode 

 int value = 12.10;
 int lower = 11.50;
 int upper = 13.80;
 
 void setup() {                
   double percent = (value - lower) / (upper - lower) * 100.0;
   Serial.begin(9600);
   Serial.println(percent);
 }