Difference between revisions of "File data manipulation"

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(Created page with " * Given a file with a single number on each line, reach only the first 10 lines, sum the total and print each number read. <syntaxhighlight lang="D"> module read_and_sum; i...")
 
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* Given a file with a single number on each line, reach only the first 10 lines, sum the total and print each number read.
 
 
<syntaxhighlight lang="D">
 
module read_and_sum;
 
 
import std.conv : to;
 
import std.stdio: writeln;
 
import std.range : takeExactly, tee;
 
import std.algorithm.iteration : map, each;
 
 
void main()
 
{
 
    double total = 0;
 
    File("./10numbers.txt")
 
        // lazily iterate by line
 
        .byLine
 
 
        // pick first 10 lines
 
        .takeExactly(10)
 
       
 
        // convert each to double
 
        .map!(to!double)
 
 
        // add element ro total
 
        .tee!((x) { total += x; })
 
 
        // print each number
 
        .each!writeln;
 
}
 
</syntaxhighlight>
 

Latest revision as of 23:00, 17 July 2020