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Commit 3dca3ce

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Implemented recursive & iterative factorial (#9 IP)
1 parent 9462862 commit 3dca3ce

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2 files changed

+79
-4
lines changed

2 files changed

+79
-4
lines changed

‎Algorithms/Recursion/Basics.ts

Lines changed: 10 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -10,11 +10,17 @@ function inception(repeat: number): string {
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return inception(repeat-1); // The recursive call should return itself so the calculated value can bubble up
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}
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console.log(inception(5));
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console.log(inception(1));
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console.log(inception(-1));
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//---------------------------------------------------------------------
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// ---------- MAIN PROGRAM ----------
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//---------------------------------------------------------------------
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if (import.meta.main) {
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// RUN: deno run Algorithms/Recursion/Basics.ts
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console.log(inception(5));
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console.log(inception(1));
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console.log(inception(-1));
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// RUN: deno run Algorithms/Recursion/Basics.ts
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}
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// --------------------------- Terminal Output: ---------------------------
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// Counter: 5

‎Algorithms/Recursion/Factorial.ts

Lines changed: 69 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,69 @@
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function calcFactorialRecursive(input: number): number {
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if (input <= 1) return 1;
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return input * calcFactorialRecursive(input-1);
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}
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function calcFactorialIterative(input: number): number | undefined {
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if (input < 0) return undefined;
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let factorial = 1;
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for (let i=2; i <= input; ++i) {
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factorial *= i;
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}
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return factorial;
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}
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function validateFactorialInput(input: number): boolean {
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return input>=0;
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}
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function printIterativeFactorial(input: number) {
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if (!validateFactorialInput(input)) {
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console.log("Input", input, "is invalid -_-'");
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return;
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}
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console.log('Iterative Factorial', input+':', calcFactorialIterative(input));
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}
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function printRecursiveFactorial(input: number) {
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if (!validateFactorialInput(input)) {
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console.log("Input", input, "is invalid -_-'");
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return;
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}
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console.log('Recursive Factorial', input+':', calcFactorialRecursive(input));
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}
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//---------------------------------------------------------------------
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// ---------- MAIN PROGRAM ----------
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//---------------------------------------------------------------------
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if (import.meta.main) {
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printIterativeFactorial(0);
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printIterativeFactorial(1);
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printIterativeFactorial(2);
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printIterativeFactorial(3);
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printIterativeFactorial(5);
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printRecursiveFactorial(4);
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printRecursiveFactorial(0);
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printRecursiveFactorial(-1);
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printRecursiveFactorial(170);
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printIterativeFactorial(171);
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// RUN: deno run Algorithms/Recursion/Factorial.ts
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}
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// --------------------------- Terminal Output: ---------------------------
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// Iterative Factorial 0: 1
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// Iterative Factorial 1: 1
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// Iterative Factorial 2: 2
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// Iterative Factorial 3: 6
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// Iterative Factorial 5: 120
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// Recursive Factorial 4: 24
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// Recursive Factorial 0: 1
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// Input -1 is invalid -_-'
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// Recursive Factorial 170: 7.257415615307994e+306
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// Iterative Factorial 171: Infinity

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