D Programming Language

What is D?

D is a general purpose systems and applications programming language. It is a higher level language than C++, but retains the ability to write high performance code and interface directly with the operating system API's and with hardware. D is well suited to writing medium to large scale million line programs with teams of developers. D is easy to learn, provides many capabilities to aid the programmer, and is well suited to aggressive compiler optimization technology.

D is not a scripting language, nor an interpreted language. It doesn't come with a VM, a religion, or an overriding philosophy. It's a practical language for practical programmers who need to get the job done quickly, reliably, and leave behind maintainable, easy to understand code.

D is the culmination of decades of experience implementing compilers for many diverse languages, and attempting to construct large projects using those languages. D draws inspiration from those other languages (most especially C++) and tempers it with experience and real world practicality.

Example: wc

This program is the D version of the classic wc (wordcount) C program. It serves to demonstrate how to read files, slice arrays, and simple symbol table management with associative arrays.

import std.file;int main (char[][] args){    int w_total;    int l_total;    int c_total;    printf ("   lines   words   bytes file/n");    foreach (char[] arg; args[1 .. args.length])    {char[] input;int w_cnt, l_cnt, c_cnt;int inword;input = cast(char[])std.file.read(arg);foreach (char c; input){    if (c == '/n')++l_cnt;    if (c != ' ')    {if (!inword){    inword = 1;    ++w_cnt;}    }    elseinword = 0;    ++c_cnt;}printf ("%8lu%8lu%8lu %.*s/n", l_cnt, w_cnt, c_cnt, arg);l_total += l_cnt;w_total += w_cnt;c_total += c_cnt;    }    if (args.length > 2)    {printf ("--------------------------------------/n%8lu%8lu%8lu total",    l_total, w_total, c_total);    }    return 0;}