Arduino IDE - Return Function

 

FUNCTIONS

Returning functions - are functions that returns value.

void setup()
{
  Serial.begin(9600);
}


void loop()
{
  double x=5, y=6;
  Serial.print( Product( x, y ) ) ;
}


float Product(int a, int b)
{
  int y = a * b; 
 
  return y;
}

Generate a result in the serial terminal
30.00
30.00
30.00
30.00
.
.
.
30.00
and so on....

Non returning function - are functions that does'nt  returns a value, also called as "void" function

int jj;
void setup()
{
  Serial.begin(9600);
}


void loop()
{
  double x=5, y=6;
  Product( x, y ) ;
  Serial.println( jj );
}


float Product(int a, int b)
{
  jj = a * b;
}

Generate a result in the serial terminal
30.00
30.00
30.00
30.00
.
.
.
30.00
and so on....

In a non-returning function any calculated results/values that are process inside that function  are stored in a global variable. Hence...you will need a global variable (i.e. "jj" in this example) to make use of the result made by the called function.