#include<iostream> #include<conio.h> #include<dos.h> #include <windows.h> #include <time.h> #define SCREEN_WIDTH 90 #define SCREEN_HEIGHT 26 #define WIN_WIDTH 70 using namespace std; HANDLE console = GetStdHandle(STD_OUTPUT_HANDLE); COORD CursorPosition; int enemyY[3]; int enemyX[3]; int enemyFlag[3]; char car[4][4] = { ' ','�','�',' ', 					'�','�','�','�', 					' ','�','�',' ', 					'�','�','�','�' }; 					 int carPos = WIN_WIDTH/2; int score = 0; void gotoxy(int x, int y){ 	CursorPosition.X = x; 	CursorPosition.Y = y; 	SetConsoleCursorPosition(console, CursorPosition); } void setcursor(bool visible, DWORD size) { 	if(size == 0) 		size = 20;	 	 	CONSOLE_CURSOR_INFO lpCursor;	 	lpCursor.bVisible = visible; 	lpCursor.dwSize = size; 	SetConsoleCursorInfo(console,&lpCursor); } void drawBorder(){ 	for(int i=0; i<SCREEN_HEIGHT; i++){ 		for(int j=0; j<17; j++){ 			gotoxy(0+j,i); cout<<"�"; 			gotoxy(WIN_WIDTH-j,i); cout<<"�"; 		} 	} 	for(int i=0; i<SCREEN_HEIGHT; i++){ 		gotoxy(SCREEN_WIDTH,i); cout<<"�"; 	} } void genEnemy(int ind){ 	enemyX[ind] = 17 + rand()%(33); } void drawEnemy(int ind){ 	if( enemyFlag[ind] == true ){ 		gotoxy(enemyX[ind], enemyY[ind]); cout<<"****"; 		gotoxy(enemyX[ind], enemyY[ind]+1); cout<<" ** "; 		gotoxy(enemyX[ind], enemyY[ind]+2); cout<<"****"; 		gotoxy(enemyX[ind], enemyY[ind]+3); cout<<" ** "; 	} } void eraseEnemy(int ind){ 	if( enemyFlag[ind] == true ){ 		gotoxy(enemyX[ind], enemyY[ind]); cout<<" "; 		gotoxy(enemyX[ind], enemyY[ind]+1); cout<<" "; 		gotoxy(enemyX[ind], enemyY[ind]+2); cout<<" "; 		gotoxy(enemyX[ind], enemyY[ind]+3); cout<<" "; 	} } void resetEnemy(int ind){ 	eraseEnemy(ind); 	enemyY[ind] = 1; 	genEnemy(ind); } void drawCar(){ 	for(int i=0; i<4; i++){ 		for(int j=0; j<4; j++){ 			gotoxy(j+carPos, i+22); cout<<car[i][j]; 		} 	} } void eraseCar(){ 	for(int i=0; i<4; i++){ 		for(int j=0; j<4; j++){ 			gotoxy(j+carPos, i+22); cout<<" "; 		} 	} } int collision(){ 	if( enemyY[0]+4 >= 23 ){ 		if( enemyX[0] + 4 - carPos >= 0 && enemyX[0] + 4 - carPos < 9 ){ 			return 1; 		} 	} 	return 0; } void gameover(){ 	system("cls"); 	cout<<endl; 	cout<<"\t\t--------------------------"<<endl; 	cout<<"\t\t-------- Game Over -------"<<endl; 	cout<<"\t\t--------------------------"<<endl<<endl; 	cout<<"\t\tPress any key to go back to menu."; 	getch(); } void updateScore(){ 	gotoxy(WIN_WIDTH + 7, 5);cout<<"Score: "<<score<<endl; } void instructions(){ 	 	system("cls"); 	cout<<"Instructions"; 	cout<<"\n----------------"; 	cout<<"\n Avoid Cars by moving left or right. "; 	cout<<"\n\n Press 'a' to move left"; 	cout<<"\n Press 'd' to move right"; 	cout<<"\n Press 'escape' to exit"; 	cout<<"\n\nPress any key to go back to menu"; 	getch(); } void play(){ 	carPos = -1 + WIN_WIDTH/2; 	score = 0; 	enemyFlag[0] = 1; 	enemyFlag[1] = 0; 	enemyY[0] = enemyY[1] = 1; 	 	system("cls"); 	drawBorder(); 	updateScore(); 	genEnemy(0); 	genEnemy(1); 	 	gotoxy(WIN_WIDTH + 7, 2);cout<<"Car Game"; 	gotoxy(WIN_WIDTH + 6, 4);cout<<"----------"; 	gotoxy(WIN_WIDTH + 6, 6);cout<<"----------"; 	gotoxy(WIN_WIDTH + 7, 12);cout<<"Control "; 	gotoxy(WIN_WIDTH + 7, 13);cout<<"-------- "; 	gotoxy(WIN_WIDTH + 2, 14);cout<<" A Key - Left"; 	gotoxy(WIN_WIDTH + 2, 15);cout<<" D Key - Right"; 	 	gotoxy(18, 5);cout<<"Press any key to start"; 	getch(); 	gotoxy(18, 5);cout<<" "; 	 	while(1){ 		if(kbhit()){ 			char ch = getch(); 			if( ch=='a' || ch=='A' ){ 				if( carPos > 18 ) 					carPos -= 4; 			} 			if( ch=='d' || ch=='D' ){ 				if( carPos < 50 ) 					carPos += 4; 			} 			if(ch==27){ 				break; 			} 		} 		 		drawCar(); 		drawEnemy(0); 		drawEnemy(1); 		if( collision() == 1 ){ 			gameover(); 			return; 		} 		Sleep(50); 		eraseCar(); 		eraseEnemy(0); 		eraseEnemy(1); 		 		if( enemyY[0] == 10 ) 			if( enemyFlag[1] == 0 ) 				enemyFlag[1] = 1; 		 		if( enemyFlag[0] == 1 ) 			enemyY[0] += 1; 		 		if( enemyFlag[1] == 1 ) 			enemyY[1] += 1; 		 		if( enemyY[0] > SCREEN_HEIGHT-4 ){ 			resetEnemy(0); 			score++; 			updateScore(); 		} 		if( enemyY[1] > SCREEN_HEIGHT-4 ){ 			resetEnemy(1); 			score++; 			updateScore(); 		} 	} } int main() { 	setcursor(0,0); 	srand( (unsigned)time(NULL)); 	 	do{ 		system("cls"); 		gotoxy(10,5); cout<<" -------------------------- "; 		gotoxy(10,6); cout<<" | Car Game | "; 		gotoxy(10,7); cout<<" --------------------------"; 		gotoxy(10,9); cout<<"1. Start Game"; 		gotoxy(10,10); cout<<"2. Instructions";	 		gotoxy(10,11); cout<<"3. Quit"; 		gotoxy(10,13); cout<<"Select option: "; 		char op = getche(); 		 		if( op=='1') play(); 		else if( op=='2') instructions(); 		else if( op=='3') exit(0); 		 	}while(1); 	 	return 0; }

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

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
}