Course of Raku / Essentials / Conditional checks / Exercises / How many numbers are equal?

Solution: How many numbers are equal?

The program should make a few comparisons. For three input numbers, there are two possible cases:

  1. All three numbers are equal,
  2. Only two numbers are equal, and
  3. All numbers are different.

Code

Here is the solution with explicit comparisons.

my $n1 = prompt 'Enter number 1: ';
my $n2 = prompt 'Enter number 2: ';
my $n3 = prompt 'Enter number 3: ';

if $n1 == $n2 == $n3 {
    say 3;
}
elsif $n1 == $n2 || $n2 == $n3 || $n1 == $n3 {
    say 2;
}
else {
    say 0;
}

🦋 Find the program in the file how-many-equal-numbers.raku.

Output

$ raku exercises/conditional-checks/how-many-equal-numbers.raku 0 0 0
Enter number 1: 14
Enter number 2: 8
Enter number 3: 8
2

$ raku exercises/conditional-checks/how-many-equal-numbers.raku 
Enter number 1: 15
Enter number 2: 15
Enter number 3: 15
3

$ raku exercises/conditional-checks/how-many-equal-numbers.raku 
Enter number 1: 4
Enter number 2: 6
Enter number 3: 8
0

Comments

  1. Note that you can compare three numbers in a single expression: $n1 == $n2 == $n3.
  2. Return to this task and solve it again after learning about the reduction operator.

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