28 lines
658 B
Java
28 lines
658 B
Java
package Maths;
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public class Factorial {
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/* Driver Code */
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public static void main(String[] args) {
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assert factorial(0) == 1;
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assert factorial(1) == 1;
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assert factorial(5) == 120;
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assert factorial(10) == 3628800;
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}
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/**
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* Calculate factorial N using iteration
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*
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* @param n the number
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* @return the factorial of {@code n}
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*/
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public static long factorial(int n) {
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if (n < 0) {
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throw new IllegalArgumentException("number is negative");
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}
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long factorial = 1;
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for (int i = 1; i <= n; factorial *= i, ++i) ;
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return factorial;
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}
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}
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