// Define motor control pins
const int leftMotorPin1 = 2;  // Connect to the input 1 of left motor driver
const int leftMotorPin2 = 3;  // Connect to the input 2 of left motor driver
const int rightMotorPin1 = 4; // Connect to the input 1 of right motor driver
const int rightMotorPin2 = 5; // Connect to the input 2 of right motor driver

// Define ultrasonic sensor pins
const int trigPin = 6;  // Connect to the trigger pin of ultrasonic sensor
const int echoPin = 7;  // Connect to the echo pin of ultrasonic sensor

// Define variables
long duration;
int distance;

void setup() {
  // Motor control pins as output
  pinMode(leftMotorPin1, OUTPUT);
  pinMode(leftMotorPin2, OUTPUT);
  pinMode(rightMotorPin1, OUTPUT);
  pinMode(rightMotorPin2, OUTPUT);

  // Ultrasonic sensor pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Serial communication for debugging
  Serial.begin(9600);
}

void loop() {
  // Measure distance using ultrasonic sensor
  distance = measureDistance();

  // Adjust motor speed based on the distance
  adjustMotorSpeed(distance);

  // Move the boat forward
  moveForward();
}

long measureDistance() {
  // Trigger ultrasonic sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Measure the duration of the pulse from echo pin
  duration = pulseIn(echoPin, HIGH);

  // Calculate distance in centimeters
  return duration * 0.034 / 2;
}

void adjustMotorSpeed(int distance) {
  // Add logic to adjust motor speed based on the distance
  // For example, reduce speed when approaching obstacles
}

void moveForward() {
  // Move the boat forward by activating both motors
  digitalWrite(leftMotorPin1, HIGH);
  digitalWrite(leftMotorPin2, LOW);
  digitalWrite(rightMotorPin1, HIGH);
  digitalWrite(rightMotorPin2, LOW);
}

// Add more functions for turning, reversing, stopping, etc.
by

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Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}