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  1. import java.util.Scanner;
  2.  
  3. class JavaApplication17 {
  4.  
  5.     public static void main(String[] args) {
  6.         Scanner in = new Scanner(System.in);
  7.         int num;
  8.         double rad30 = Math.toRadians(30);
  9.         double rad45 = Math.toRadians(45);
  10.         System.out.print("Digite: ");
  11.         num = in.nextInt();
  12.         System.out.println("Math.sin(30) " + Math.sin(rad30));
  13.         System.out.println("sen(30) " + sen(rad30, num) + "\n");
  14.         System.out.println("Math.sin(45) " + Math.sin(rad45));
  15.         System.out.println("sen(45) " + sen(rad45, num));
  16.     }
  17.  
  18.     public static double fatorial(int n) {
  19.         if (n == 0) {
  20.             return 1;
  21.         }
  22.         return n * fatorial(n - 1);
  23.     }
  24.  
  25.     public static double potencia(double base, int expoente) {
  26.         int i;
  27.         double result = 1;
  28.         if (expoente == 0) {
  29.             return 1;
  30.         } else if (base == 0) {
  31.             return 0;
  32.         } else {
  33.             if (expoente < 0) {
  34.                 expoente = -expoente;
  35.                 base = 1 / base;
  36.             }
  37.             for (i = 1; i <= expoente; i = i + 1) {
  38.                 result = result * base;
  39.             }
  40.             return result;
  41.         }
  42.     }
  43.  
  44.     public static double sen(double x, int qtdTermos) {
  45.         double result = 0;
  46.         int n;
  47.         for (n = 0; n < qtdTermos; n = n + 1) {
  48.             result = result + potencia(-1, n)
  49.                     / fatorial(2 * n + 1) * potencia(x, 2 * n + 1);
  50.         }
  51.         return result;
  52.     }
  53.  
  54.     /*public static double somatorio(int n) {
  55.         double result = 1.0;
  56.         int i, numerador = 2, denominador = 3, expoente = 3;
  57.         for (i = 1; i <= n - 1; i = i + 1) {
  58.             result = result
  59.                     + potencia(numerador, expoente) / fatorial(denominador);
  60.             numerador = numerador + 1;
  61.             expoente = expoente + 1;
  62.             denominador = denominador + 2;
  63.         }
  64.         return result;
  65.     }*/
  66. }
Success #stdin #stdout 0.15s 38060KB
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Digite: Math.sin(30) 0.49999999999999994
sen(30) 0.49999999999999994

Math.sin(45) 0.7071067811865475
sen(45) 0.7071067811865475
https://ideone.com/225zsW
sen
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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