The origin and development history of C language

Title: The Origin and Development History of C Language

C language is a high-level programming language widely used in the development of system software and application software. It has the characteristics of structure, modularity and portability, and is one of the most important and popular programming languages ​​in the computer field. This article will introduce the origin and development history of the C language, and illustrate it with specific code examples.

1. The Origin of C Language

The history of C language can be traced back to 1969, when Dennis Ritchie and Ken Thompson of Bell Labs designed a new operating system to develop the UNIX operating system. programming language, this is the originator of C language. The C language was originally designed as a development language for UNIX systems. Its syntax was borrowed from the BCPL language and improved on it, introducing more operators and syntax structures.

2. The development history of C language

1. Early development stage

The early development of C language was mainly concentrated within Bell Labs for development UNIX systems and related tools. With the popularity of UNIX systems, C language gradually began to be used in other fields. In 1978, Brian Kernighan and Dennis Ritchie co-authored "The C Programming Language". This book became a classic textbook for C language programmers and promoted the popularity of C language.

2. Standardization stage

In order to promote the standardization and unification of C language, ANSI (American National Standards Institute) established a committee in 1983 to formulate standards for C language . In 1989, ANSI officially released the C language standard ANSI C (also known as C89). Later, ISO (International Organization for Standardization) released ISO C90 in 1990, standardizing ANSI C as an international standard.

3. Following development stage

With the continuous development of computer technology, the C language is also constantly evolving and developing. In 1999, ISO released a new standard for the C language, ISO C99, which introduced some new features and improvements. Later, ISO C11 was released in 2011, further expanding the functions and performance of the C language.

3. Code examples of C language

The following uses specific code examples to illustrate the basic syntax and features of C language:

#include <stdio.h>

int main() {
    int num1 = 10;
    int num2 = 20;
    int sum;

    sum = num1 num2;

    printf("Sum of two numbers: %d
", sum);

    return 0;
}

In this simple example, we define two integer variables num1 and num2, then add them and assign the result to the variable sum, and finally use the printf function to output the sum of the two numbers. This demonstrates the basic syntax and flow control of the C language.

4. Summary

As an efficient, flexible and versatile programming language, C language has become an indispensable part of the computer field after years of development. It plays an important role in system programming, application development and embedded fields. This article briefly introduces the origin and development history of the C language, and demonstrates its basic syntax and features through code examples. I hope readers will have a better understanding and knowledge of C language.

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