#include <iostream>
#include <vector>
#include <string>
class Buffer {
private:
int current_line = -1;
std::vector<std::string> contents;
public:
Buffer() {
}
bool Append(std::string input) {
while (input != ".") {
if (input[0] != '\0') {
contents.push_back(input);
current_line++;
}
std::getline(std::cin, input);
}
return true;
}
bool Insert(std::string input) {
while (input != ".") {
if (input[0] != '\0') {
if (current_line < 0) {
Append(input);
return true;
} else {
contents.insert(contents.begin()+current_line, input);
}
current_line++;
}
std::getline(std::cin, input);
}
current_line--;
return true;
}
bool Delete() {
if (current_line < 0) return false;
if (current_line == 0) {
contents.erase(contents.begin());
current_line = -1;
}
if (current_line == contents.size()-1) {
contents.erase(contents.begin()+current_line);
current_line = contents.size()-1;
}
else {
contents.erase(contents.begin()+current_line);
}
return true;
}
bool Change() {
if (current_line < 0) return false;
std::string input;
std::getline(std::cin, input);
if (input == "\0") {
Delete();
}
contents[current_line] = input;
std::getline(std::cin, input);
while (input != ".") {
current_line++;
contents.insert(contents.begin()+current_line, input);
std::getline(std::cin, input);
}
return true;
}
bool Print(bool print_all) {
if (current_line < 0) return false;
if (print_all) {
for (int i = 0; i < contents.size(); i++) {
std::cout << i+1 << " " << contents[i] << std::endl;
}
return true;
}
else {
std::cout << contents[current_line] << std::endl;
return true;
}
}
};
class Parser {
private:
Buffer buffer;
public:
explicit Parser(Buffer b) {
buffer = b;
}
Parser() {
}
bool Check(std::string command) {
if (command == "a") {
std::string input;
std::getline(std::cin, input);
buffer.Append(input);
} else if (command == "i") {
std::string input;
std::getline(std::cin, input);
buffer.Insert(input);
} else if (command == "c") {
if (buffer.Change() == false) {
std::cout << "Error : There is no data! Please try again." << std::endl;
}
} else if (command == "d") {
if (buffer.Delete() == false) {
std::cout << "Error : There is no data! Please try again." << std::endl;
}
} else if (command == "p") {
if (buffer.Print(false) == false) {
std::cout << "Error : There is no data! Please try again." << std::endl;
}
} else if (command == "%p") {
if (buffer.Print(true) == false) {
std::cout << "Error : There is no data! Please try again." << std::endl;
}
} else if (command == "q") {
return false;
} else {
std::cout << "Error : Illegal command! Please try again." << std::endl;
}
return true;
}
};
int main() {
std::cout << "Welcome to use CYCUICE editor..." << std::endl;
std::string command;
std::cin >> command;
std::cin.ignore(10000, '\n');
Buffer buffer;
Parser parser(buffer);
while (parser.Check(command)) {
std::cin >> command;
std::cin.ignore(10000, '\n');
}
std::cout << "Thank you for using CYCUICE editor!" << std::endl;
} 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!
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;
}
C++ is a widely used middle-level programming language.
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.
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;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
//code
}
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
}
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);
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.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
// code
}