if-else and else-if Statements
- The else and else-if both are used after writing the if statement.
- It allows multiple conditions to be execute all together.
- The if-else condition is made up of two statements: if () and else ().
- If the output of the If () statement is false, the condition in the else statement is implemented.
 |
| if-else statement |
Let us take example
if (condition)
{
// statements
}
else
{
//statements
}
Example 1:
int a = 5;
int b= 6;
void setup ( )
{
Serial.begin ( 9600 );
}
void loop ( )
{
if ( a > b )
{
Serial.println ( " a is greater " );
}
else
{
Serial.println ( " a is smaller " );
}
}
Expected Output:
- In above example, the values are initialized in variables a and b. The message satisfying the condition will be printed.
Example 2:
const int LED1 = 4;
int x = 150 ;
void setup ( )
{
Serial.begin( 9600 );
pinMode ( LED1, OUTPUT);
}
void loop ( )
{
if ( x > 100 )
{
digitalWrite(LED1, HIGH);
Serial.println ( " LED1 will light +++");
delay (500);
}
else
{
Serial.println ( "LED1 will not light");
}
}
Expected Output:
LED1 will light +++
- If the initialized value of x is less than 100, the message ' LED1 will not light ' will be printed in the output.
Else if
- The else if statement can be used with or without the else ( ) statement.
- We can include multiple else if statements in a program.
if (condition)
{
// statements
}
else if ( condition)
{
// statements
// only if the first condition is false and the second is true
}
else
{
//statements
}
Example 1:
int i = 2;
int j = 3;
void setup ( )
{
Serial.begin(9600);
}
void loop ( )
{
if ( i > j )
{
Serial.println( " I is greater ");
}
else if ( i < j )
{
Serial.println( " J is greater " );
}
else
{
Serial.println( " Both are equal " );
}
}
Expected Output:
J is greater
Tags:
Arduino Device
Arduino if-else and else-if
Arduino Programming Language
ermskuthar
if-else and else-if
mskuthar