java用for,while,do_while循环语句以及递归方法计算n的阶乘
//for循环 public static void forFunc(int n) { int result = 1; StringBuffer str = new StringBuffer(); for (int i = n; i > 0; i--) { if (i > 1) { str.append(i + "*"); } else { str.append(i + "="); } result *= i; } str.append(result); System.out.print(str.toString()); } //while循环 public static void whileFunc(int n) { int result = 1; StringBuffer str = new StringBuffer(); while (n > 0) { if (n > 1) { str.append(n + "*"); } else { str.append(n + "="); } result *= n; n--; } str.append(result); System.out.print(str.toString()); } //do_while循环 public static void doWhileFunc(int n) { int result = 1; StringBuffer str = new StringBuffer(); do { if (n > 1) { str.append(n + "*"); } else { str.append(n + "="); } result *= n; n--; } while (n > 0); str.append(result); System.out.print(str.toString()); } //递归 public static void recursiveFunc(int n, int result) { if (n > 1) { System.out.print(n + "*"); recursiveFunc(n - 1, result * n); } else { System.out.print(n + "=" + result); } }