[Urgent] How to solve this problem ?('amp' was not declared in this scope)

Projects Programming
1 
[code lang=”c” highlight=””]
//define pin name
#define dir_1 7
#define pwm_1 6
#define switch_1 13
#define switch_2 12
#define dir_2 4
#define pwm_2 3
#define pot A1 //potentiometer
void setup(){
//declare pins as INPUT/OUTPUT
pinMode(pwm_1,OUTPUT);
pinMode(dir_1,OUTPUT);
pinMode(pwm_2,OUTPUT);
pinMode(dir_2,OUTPUT);
pinMode(pot,INPUT);
pinMode(switch_1, INPUT);
pinMode(switch_2, INPUT);
Serial.begin(9600); //I am using Serial Monitor instead of LCD display
}
void loop(){
int pwm_value;
for (pwm_value=0;pwm_value<=255;pwm_value++){
digitalWrite(dir_1,digitalRead(switch_1)); //controls the direction the motor
digitalWrite(dir_2,!digitalRead(switch_2));
analogWrite(pwm_2,pwm_value); //increase the speed of the motor from 0 to 255
analogWrite(pwm_1,(255-pwm_value)); //decrease the speed of the motor from 255 to 0
Serial.println("PWM:");
Serial.println(pwm_value); //Display the value of PWM
delay(100);
}
while(1) continue; //terminate the program
}

[/code]

This message had been shown "'amp' was not declared in this scope" after I compiled.
How to solve this problem? any idea?

2

Nice. Double escaped. Somebody got source code from a buggy website.

Replace all "&lt;" with "<".

Replace all "&gt;" with ">".

3

how about 'quot' was not declared in this scope?
this happened too

4

For whatever reason those were single escaped which makes them a good candidate for Google...
https://www.google.com/search?q=%26quot%3B