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[](https://onecompiler.com/) [Pricing](https://onecompiler.com/pricing) Learn Code Deploy More Login Main.cpp # C++ Hello World AI CPP RUN AI CPP RUN Main.cpp 1 2 3 4 5 6 7 8 \#include \<iostream\> using namespace std; int main() { cout \<\< "Hello, World\!"; return 0; } הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX STDIN Output: ``` Click on RUN button to see the output ``` # 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 GCC 13 with C++17 support. 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 } ``` ###### OneCompiler.com [About](https://onecompiler.com/about)[Use Cases](https://onecompiler.com/customer-use-cases)[Contact](https://onecompiler.com/contact) [Users](https://onecompiler.com/users)[Status](https://status.onecompiler.com/)[Pricing](https://onecompiler.com/pricing)[Refund Policy](https://onecompiler.com/about#refund-policy) [GitHub](https://github.com/onecompiler)[LinkedIn](https://www.linkedin.com/company/onecompiler)[Facebook](https://www.facebook.com/onecompiler)[Instagram](https://www.instagram.com/onecompiler)[Twitter](https://twitter.com/OneCompilerHQ) ###### Languages 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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 GCC 13 with C++17 support. 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 } ```