【java 大数】hdu java 大数

HDU 1002 A + B Problem II

import java.math.BigDecimal;import java.math.BigInteger;import java.math.MathContext;import java.text.DecimalFormat;import java.util.Scanner;public class Main {public static void main(String[] agrs) {Scanner hehe = new Scanner(System.in);while(hehe.hasNextInt()){BigInteger a, b, c;int t, i;t = hehe.nextInt();i = 1;while(i <= t){a = hehe.nextBigInteger();b = hehe.nextBigInteger();c = a.add(b);System.out.println("Case " + i + ":");System.out.println(a + " + " + b + " = " + c);if(i < t) System.out.println("");i ++;}}}}

HDU 1047 Integer Inquiry

import java.math.BigDecimal;import java.math.BigInteger;import java.math.MathContext;import java.text.DecimalFormat;import java.util.Scanner;public class Main {public static void main(String[] agrs) {Scanner hehe = new Scanner(System.in);while (hehe.hasNextInt()) {BigInteger a, b;BigInteger zero = new BigInteger("0");int t, i;t = hehe.nextInt();i = 1;while (i <= t) {b = zero;while (true) {a = hehe.nextBigInteger();if (a.compareTo(zero) == 0)break;b = b.add(a);}System.out.println(b);if (i < t)System.out.println("");i++;}}}}

HDU 1042 N！

import java.math.BigDecimal;import java.math.BigInteger;import java.math.MathContext;import java.text.DecimalFormat;import java.util.Scanner;public class Main {public static void main(String[] agrs) {Scanner hehe = new Scanner(System.in);while (hehe.hasNextInt()) {BigInteger one = new BigInteger("1");  BigInteger i, sum, n;i = new BigInteger("1");sum = new BigInteger("1");n = hehe.nextBigInteger();int cmp = i.compareTo(n);while (cmp <= 0) {sum = sum.multiply(i);i = i.add(one);cmp = i.compareTo(n);}System.out.println(sum);}}}

HDU 1063 Exponentiation

import java.math.BigDecimal;import java.math.BigInteger;import java.math.MathContext;import java.text.DecimalFormat;import java.util.Scanner;public class Main {public static void main(String[] agrs) {Scanner jx = new Scanner(System.in);int n, i;BigDecimal r, a;BigDecimal one = new BigDecimal("1");while (jx.hasNextBigDecimal()) {r = jx.nextBigDecimal();n = jx.nextInt();a = one;for (i = 0; i < n; i++)a = a.multiply(r);a = a.stripTrailingZeros(); // BigDecimal stripTrailingZeros()// 返回数值上等于此小数，// 但从该表示形式移除所有尾部零的 BigDecimalString str = a.toPlainString(); // String toPlainString() 返回不带指数字段的此// BigDecimal 的字符串表示形式。// 通俗来讲就是直接显示，不用科学计数法表示。if (str.startsWith("0."))str = str.substring(1); // 返回新字符串,此字符串的子字符串该，子字符串从指定索引处字符开始直此字符串末尾System.out.println(str);}}}

HDU 1316 How Many Fibs?

import java.math.BigDecimal;import java.math.BigInteger;import java.math.MathContext;import java.text.DecimalFormat;import java.util.Scanner;public class Main {public static void main(String[] agrs) {Scanner hehe = new Scanner(System.in);BigInteger f[] = new BigInteger[501];BigInteger zero = new BigInteger("0");f[1] = new BigInteger("1");f[2] = new BigInteger("2");for (int i = 3; i <= 500; i++)f[i] = f[i - 1].add(f[i - 2]);while (hehe.hasNextBigInteger()) {BigInteger a = hehe.nextBigInteger();BigInteger b = hehe.nextBigInteger();if (a.compareTo(zero) == 0 && b.compareTo(zero) == 0)break;int ans = 0;for (int i = 1; i <= 500; i++) {if (a.compareTo(f[i]) <= 0 && b.compareTo(f[i]) >= 0)ans++;if (b.compareTo(f[i]) < 0)break;}System.out.println(ans);}}}

HDU 1715 大菲波数

import java.math.BigDecimal;import java.math.BigInteger;import java.math.MathContext;import java.text.DecimalFormat;import java.util.Scanner;public class Main {public static void main(String[] agrs) {Scanner hehe = new Scanner(System.in);BigInteger f[] = new BigInteger[1001];BigInteger zero = new BigInteger("0");f[1] = new BigInteger("1");f[2] = new BigInteger("1");for (int i = 3; i <= 1000; i++)f[i] = f[i - 1].add(f[i - 2]);while (hehe.hasNextInt()) {int n = hehe.nextInt();for (int i = 0; i < n; i++) {int x = hehe.nextInt();System.out.println(f[x]);}}}}

HDU 1753 大明A+B

import java.math.BigDecimal;import java.math.BigInteger;import java.math.MathContext;import java.text.DecimalFormat;import java.util.Scanner;public class Main {public static void main(String[] agrs) {Scanner hehe = new Scanner(System.in);while (hehe.hasNextBigDecimal()) {BigDecimal a = hehe.nextBigDecimal();BigDecimal b = hehe.nextBigDecimal();BigDecimal c = a.add(b);c = c.stripTrailingZeros();String ss = c.toPlainString();if (ss.startsWith("0."))ss = ss.substring(1);System.out.println(ss);}}}

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