use h_bridge to connect two motor let user enter speed and dirrection to one of motors and the another motor will work in the same speed - arduino-c++

Question

use h_bridge to connect two motor let user enter speed and dirrection to one of motors and the another motor will work in the same speed but in different direction. so in this i write a code but does not run with me
// C++ code
//
void setup()
{
pinMode(10, OUTPUT);
pinMode(9, OUTPUT);
pinMode(8, OUTPUT);
pinMode(6, OUTPUT);
pinMode(5, OUTPUT);
pinMode(4, OUTPUT);
Serial.begin(9600);
while (! Serial);
Serial.println("Speed 0 to 255");
}
void loop()
{
/*digitalWrite(9, HIGH);
delay(1000); // Wait for 1000 millisecond(s)
digitalWrite(8, LOW);
//delay(1000); // Wait for 1000 millisecond(s)
analogWrite(10,200);*/
if (Serial.available()) {
//int en = Serial.parseInt();
int hl = Serial.parseInt();
if(hl==1)
{
analogWrite(10, 80);
analogWrite(6, 0);
// motor1.set_speed(80);
digitalWrite(9, HIGH);
digitalWrite(8, LOW);
digitalWrite(5,LOW);
digitalWrite(4, LOW);
delay(5000);
analogWrite(10, 20);
analogWrite(6, 0);
// motor1.set_speed(20);
digitalWrite(9, LOW);
digitalWrite(8, HIGH);
digitalWrite(5,LOW);
digitalWrite(4, LOW);
// Serial.println("direction is" + hl);
}
/*else if(hl==-1){
digitalWrite(9, LOW);
digitalWrite(8, HIGH);
Serial.println("direction is" + hl);
}*/
else if(hl==2){
analogWrite(10, 0);
analogWrite(6, 50);
digitalWrite(9, LOW);
digitalWrite(8, LOW);
digitalWrite(5,HIGH);
digitalWrite(4, LOW);
delay(3000);
analogWrite(10, 0);
analogWrite(6, 90);
digitalWrite(9, LOW);
digitalWrite(8, LOW);
digitalWrite(5,LOW);
digitalWrite(4, HIGH);
// Serial.println("direction is" + hl);
}
else {
analogWrite(10, 0);
analogWrite(6, 0);
digitalWrite(9, LOW);
digitalWrite(8, LOW);
digitalWrite(5,LOW);
digitalWrite(4, LOW);
}
}
}
if any one can help me
there is no error in code and debgging i check that but there in her i
/*else if(hl==-1){
digitalWrite(9, LOW);
digitalWrite(8, HIGH);
Serial.println("direction is" + hl);
}*/
i thing there is a wrong