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/*
  Temperature Sensor
 */
 
int raw = 0; float temp = 0;
 
void setup() {                
    Serial.begin(9600);
    pinMode( A0, INPUT );
}
 
 
void loop() {
 
    int n = 10000; double s, avg;
    s=0;
    for(int i=0; i<n; i++){
        raw = analogRead(A0);
        s+=raw; //delay(10);
    }
    avg = s/n;
    //temp = ( avg/1023.0 )*5.0*1000/10;
    temp=avg/26.9398907;
    Serial.print("average analogRead: "); Serial.println(int(avg));
    Serial.print("Temperature: "); Serial.println(temp);
    delay(500); 
 
}
 
 

prog.cpp: In function ‘void setup()’:
prog.cpp:8:5: error: ‘Serial’ was not declared in this scope
     Serial.begin(9600);
     ^~~~~~
prog.cpp:9:14: error: ‘A0’ was not declared in this scope
     pinMode( A0, INPUT );
              ^~
prog.cpp:9:18: error: ‘INPUT’ was not declared in this scope
     pinMode( A0, INPUT );
                  ^~~~~
prog.cpp:9:5: error: ‘pinMode’ was not declared in this scope
     pinMode( A0, INPUT );
     ^~~~~~~
prog.cpp: In function ‘void loop()’:
prog.cpp:18:26: error: ‘A0’ was not declared in this scope
         raw = analogRead(A0);
                          ^~
prog.cpp:18:15: error: ‘analogRead’ was not declared in this scope
         raw = analogRead(A0);
               ^~~~~~~~~~
prog.cpp:24:5: error: ‘Serial’ was not declared in this scope
     Serial.print("average analogRead: "); Serial.println(int(avg));
     ^~~~~~
prog.cpp:26:5: error: ‘delay’ was not declared in this scope
     delay(500);
     ^~~~~

Standard output is empty