Systems & hardware

C

C is a general-purpose, procedural computer programming language supporting structured programming, lexical variable scope, and recursion, while a static type system prevents unintended operations. By design, C provides constructs that map efficiently to typical machine instructions and has found lasting use in applications previously coded in assembly language. Such applications include operating systems and various application software for computer architectures that range from supercomputers to PLCs and embedded systems.

Share this starting point code.study/c
Created by
Dennis Ritchie
First appeared
1972
Official resource
Visit the main website

Your first program

Hello, World!

C
#include <stdio.h>

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

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Teach me the basics of C. Use https://code.study/c as the starting point. Explain what C is best suited for, when I should not choose it, how to install or try it, and then walk me through its Hello World example step by step.

Content reviewed August 2026 · Start with primary sources and verify version-specific details.