STEMCenter USA Pi-Bot v2.00, User Manual

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4. Let’s do the example as shown in Figure 3.3.
Figure 3.3
5. Things to note about the if statement in the example:
a. The logical test is == not just =. A single = is an assignment statement.
b. In the statement
var1 = 1
, the value of 1 is assigned to the variable
var1
. In the
statement
var1 == 1
, the value of
var1
is compared to the value of 1 and returns a
“true” if the values are equal and “false” if the values are not equal.
6. Take a few minutes to change the value of
var1
in the example to see what happens to the
value of
var2
. Does the output make sense?
7. The logical operators are:
a. == test if equal
b. != test if not equal
c. < test if less than
d. > test if greater than
e. <= test if less than or equal to
f. >= test if greater than or equal to
void setup()
{
Serial.begin(9600);
}
void loop()
{
int var1, var2;
var1 = 1;
var2 = 1;
if( var1 == 1)
{
var2 = 2;
}
Serial.print("var1 = ");
Serial.print(var1, DEC);
Serial.print(" var2 = ");
Serial.println(var2, DEC);
Serial.println(" ");
delay(1000);
}