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                基本的整數和浮點數精度不滿足要求的時候可以使用java提供的BigInteger類和BigDecimal類。 ## java.math.BigInteger java.math.BigInteger提供的方法: 1. BigInteger add(BigInteger other) 2. BigInteger subtract(BigInteger other) 3. BigInteger multiply(BigInteger other) 4. BigInteger divide(BigIntegr other) 5. int compareto(BigInteger other) 6. BigInteger mod(BigInteger other) 7. static BigInteger valueOf(long x) valueOf方法可以將普通的數值轉換為大數值: ~~~ BigInteger a=BigInteger.valueOf(100); ~~~ ## 輸出febonacci數列 輸出febonacci數列前100項,大約在93項時會超出long的范圍: ~~~ public static void fibonacci(){ long[] a=new long[100]; for(int i=0;i<100;i++){ if(i==0){ a[0]=0; System.out.print(a[i]+"\t"); continue; }else if(i==1){ a[1]=1; System.out.print(a[i]+"\t"); continue; } a[i]=a[i-1]+a[i-2]; System.out.print(a[i]+"\t"); if((i+1)%5==0){System.out.println("");} } } ~~~ ![](https://box.kancloud.cn/2016-02-26_56cfbddd33b9f.jpg)? 改進: ~~~ public static void fibonacci() { BigInteger[] a = new BigInteger[200]; for (int i = 0; i < 200; i++) { if (i == 0) { a[0] = BigInteger.valueOf(0); System.out.print(a[i] + "\t"); continue; } else if (i == 1) { a[1] = BigInteger.valueOf(1); System.out.print(a[i] + "\t"); continue; } a[i] = a[i - 1].add(a[i - 2]); System.out.println("第" + i + "項:\t" + a[i] + "\t"); } } ~~~ ![](https://box.kancloud.cn/2016-02-26_56cfbddd72fee.jpg)
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