Can the function be written without ";" in the end? [closed]

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I have seen the following code on the Internet:

#include <SoftwareSerial.h>
SoftwareSerial mySerial(8,9);
void setup()
{
 mySerial.begin(9600); 
 Serial.begin(9600); 
 delay(100);
}
void loop()
{
 if (Serial.available()>0)
 mySerial.write(Serial.read());
 if (mySerial.available()>0)
 Serial.write(mySerial.read());
}

The command works perfectly fine. How was it possible in the code to write the command without ";" at the end of the line?

The link to the code is: enter link description here

• Juraj: take a coding course or read a book about C or C++

Answer 1

Do you refer to this block?

if (Serial.available()>0) <- here
mySerial.write(Serial.read());
if (mySerial.available()>0) <- here
Serial.write(mySerial.read());

If so, there is a ; at the end of each command. The commands are just split onto two lines each. It could be written like this:

if (Serial.available()>0) mySerial.write(Serial.read());
if (mySerial.available()>0) Serial.write(mySerial.read());

The second and fourth lines are the body of the if. Better indenting with the original arrangement would be:

if (Serial.available()>0)
 mySerial.write(Serial.read());
if (mySerial.available()>0)
 Serial.write(mySerial.read());

Or even better, include the brackets around the body:

if (Serial.available()>0) {
 mySerial.write(Serial.read());
}
if (mySerial.available()>0) {
 Serial.write(mySerial.read());
}

• Асмир Абдимажитов: So this means, we are allowed to neglect the {} and () for conditions, right? But why do sometimes errors occur if I do not write this symbols?
• Majenko: You can omit the brackets if there is only one statement in the body of the if.
• JRobert: A conditional or loop expression, such as 'if' or 'while', controls the next statement or block. It does not need its own semicolon because it is not a complete complete statement. A block is one or more statements surrounded by '{' and '}' and is treated like a statement. So the following simple statement ended with ';' or block surronded by '{', '}' is a necessary part of the 'if' or 'while'.