计算数字的幂. Java

#计算 #java

使用 while 循环计算数字的幂

Java

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class Main {
  public static void main(String[] args) {
​
    int base = 3, exponent = 4;
​
    long result = 1;
​
    while (exponent != 0) {
      result *= base;
      --exponent;
    }
​
    System.out.println("Answer = " + result);
  }
}

Output result

Answer = 81

使用 for 循环计算数字的幂

Java

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class Main {
  public static void main(String[] args) {
​
    int base = 3, exponent = 4;
​
    long result = 1;
​
    for (; exponent != 0; --exponent) {
      result *= base;
    }
​
    System.out.println("Answer = " + result);
  }
}

Output result

Answer = 81

使用 pow() 函数计算数字的幂

Java

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class Main {
  public static void main(String[] args) {
​
    int base = 3, exponent = -4;
    double result = Math.pow(base, exponent);
​
    System.out.println("Answer = " + result);
  }
}

Output result

Answer = 0.012345679012345678

负数的计算能力

Java

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class Main {
  public static void main(String[] args) {
​
    // negative number
    int base = -3, exponent = 2;
​
    double result = Math.pow(base, exponent);
    System.out.println("Answer = " + result);
  }
}

Output result

Answer = 9.0

Java

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计算数字的幂. Java

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