D Programming Language: Calculate Sum of Numbers from 1 to n

The given code is written in the D programming language and it calculates the sum of numbers from 1 to 'n'.

Here is a breakdown of the code:

'import std.stdio;' - This imports the standard input/output module from the standard library, which allows reading input from the user and printing output to the console.
'import std.conv;' - This imports the standard conversion module from the standard library, which provides functions for converting between various types.
'int n = to!int(readln());' - This line reads a line of input from the user, converts it to an integer, and assigns it to the variable 'n'. The 'readln()' function reads a line of input, and the 'to!int()' function converts the input to an integer.
'int ans = 0;' - This initializes the variable 'ans' to 0. This variable will be used to store the sum of the numbers.
'foreach(i; 1..n+1)' - This is a loop that iterates over the range from 1 to n+1. In each iteration, the loop variable 'i' takes on the values from 1 to 'n'.
'ans += i;' - This line adds the value of 'i' to 'ans'. This is equivalent to calculating the sum of numbers from 1 to 'n'.
'writeln(ans);' - This line prints the value of 'ans' to the console.
'return 0;' - This line ends the program and returns 0 to the operating system.

Overall, this code calculates the sum of numbers from 1 to the input value 'n' and prints the intermediate sums to the console.