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[on:]

int ledPin = 13;
int inputPin = 3;
int val = 0;

void setup()
{
pinMode(ledPin, OUTPUT);
pinMode(inputPin, INPUT);
}

void loop()
{
 if (inputPin == val );
  {
    digitalWrite(ledPin, LOW);
  }
 if else (inputPin == val);
  {
    digitalWrite(ledPin, HIGH);
}

sketch_dec25b.cpp: In function 'void loop()':
sketch_dec25b:16: error: expected `(' before 'else'
sketch_dec25b:19: error: expected `}' at end of input
 
what happen i can't understand, pliz help me

[Reply #1 on:]

The semicolon at the end of this line:

Code:

if (inputPin == val );

terminates the if statement. So it means "if inputPin equals val, do nothing"

The loop() should be:

Code:

void loop()
{
 if (inputPin == val )
  {
    digitalWrite(ledPin, LOW);
  }
 if else (inputPin == val)
  {
    digitalWrite(ledPin, HIGH);
}

Pete

[Reply #2 on:]

sketch_dec25a.cpp: In function 'void loop()':
sketch_dec25a:16: error: expected `(' before 'else'
sketch_dec25a:19: error: expected `}' at end of input

but it send this error

[Reply #3 on:]

i have solve it . thank u for your help

int ledPin = 13;
int inputPin = 3;
int val = 0;

void setup()
{
pinMode(ledPin, OUTPUT);
pinMode(inputPin, INPUT);
}

void loop()
{
 if (inputPin <= val )
  {
    digitalWrite(ledPin, LOW);
  }
 else
  {
    digitalWrite(ledPin, HIGH);
  }
}