Course of Raku / Essentials / Numbers / Exercises / Sum of numbers from 1 to 100

Solution: Sum of numbers from 1 to 100

To compute a sum of integer numbers from 1 to 100, it is, of course, possible to add all those numbers in a single long expression. Or create a loop (we’ll cover loops in the further sections). But the best solution is to use a well-known formula:

With the formula, the solution becomes rather trivial.

Code

my $N = 100;
my $sum = $N * (1 + $N) / 2;
say "The sum of the numbers from 1 to $N is $sum.";

🦋 You can find the full code in the file sum1-100.raku.

Output

$ raku exercises/numbers/sum1-100.raku 
The sum of the numbers from 1 to 100 is 5050.

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