Start Introduction Functions The First Program Printing Variables Comparison Operators Conditional Statement Return Exits the Function Compound Statement Boolean Operators Return Can Return an Expression Exercise: Maximum of 3 numbers Division Operators While Loop Exercise: Number of Digits More Assignment Operators Character Input Reading Characters in a Loop Exercise: Count Lines, Words, and Characters Reading a Number Break Exits the Loop Check If a Number Is Prime Boolean Flags For Loop Exercise: Fibonacci Sequence Exercise: Euclidean Algorithm Introduction to Pointers Pass by Value Passing a Pointer Scanf Function Exercise: Number of Days Between Two Dates Switch Statement Arrays Exercise: Repeat the Input Exercise: Shift an Array Right Passing an Array to a Function Exercise: Linear Search Exercise: Binary Search Time Complexity Char Type Strings: Introduction Strings: Iteration Strings: Length Strings: Copy Strings: Concatenation Strings: Comparison Files: Introduction Reading a File Line by Line Reading From stdin Writing to Files to be continued... С Playground Reference Questions or Feedback?

С Playground

Want to test some idea, or check how some language construct works? Do it here.

You can also "upload" some files. Files don't actually get uploaded anywhere, they stay in your browser, and are available to your code via fopen as usual.

Uploaded files will appear below the output box; if your code write to a file, it will appear there as well (but don't forget to fclose it).

Note: it's plain C, not C++! std::cout and things like that will not work here.

#include <stdio.h>

int main() {
	printf("Hello World!\n");
	return 0;
}