Mpi.h - C++ - OneCompiler

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 }