Large numbers

Author: kunal-kushwaha

lectures/22-large numbers/code/Factorial.java

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+import java.math.BigInteger;
+
+class Factorial {
+  
+  static BigInteger fact(int num) {
+    BigInteger ans = new BigInteger("1");
+
+    for (int i=2; i<= num; i++)   {
+      ans = ans.multiply(BigInteger.valueOf(i));
+    }
+    
+    return ans;
+  }
+}

lectures/22-large numbers/code/Main.java

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+import java.math.BigInteger;
+import java.math.BigDecimal;
+
+class Main {
+  public static void main(String[] args) {
+    BD();
+  }
+
+  static void BD() {
+    double x = 0.03;
+    double y= 0.04;
+    // double ans = y-x;
+    // System.out.println(ans);
+
+    BigDecimal X = new BigDecimal("0.03");
+    BigDecimal Y = new BigDecimal("0.04");
+    BigDecimal ans = Y.subtract(X);
+    // System.out.println(ans);
+
+    BigDecimal a = new BigDecimal("456576345675.4546376");
+    BigDecimal b = new BigDecimal("547634565352.986785764");
+
+    // operations
+    System.out.println(b.add(a));
+    System.out.println(b.subtract(a));
+    System.out.println(b.multiply(a));
+    System.out.println(b.pow(2));
+    System.out.println(b.negate());
+
+    // constants
+    BigDecimal con = BigDecimal.ONE;
+
+  }
+
+  
+  static void BI() {
+    int a = 30;
+    int b = 67;
+
+    BigInteger B = BigInteger.valueOf(6); // convert int/long to BI
+    int c = B.intValue(); // convert BI to int
+    BigInteger C = new BigInteger("2345678654325678976543256789");
+    BigInteger X = new BigInteger("4536789765432");
+
+    // constants
+    BigInteger D = BigInteger.TEN;
+
+    // operations
+    BigInteger s = C.add(X);
+
+    BigInteger m = C.multiply(X);
+
+    BigInteger sub = C.subtract(X);
+
+    BigInteger d = C.divide(X);
+
+    BigInteger rem = C.remainder(X);
+
+    if (X.compareTo(C) < 0) {
+          System.out.println("Yes");
+    } 
+
+    System.out.println(Factorial.fact(100));
+  }
+  
+}

lectures/22-large numbers/code/pom.xml

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+<project>
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>mygroupid</groupId>
+  <artifactId>myartifactid</artifactId>
+  <version>0.0-SNAPSHOT</version>
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.12</version>
+      <type>jar</type>
+    </dependency>
+    <dependency>
+      <groupId>com.googlecode.json-simple</groupId>
+      <artifactId>json-simple</artifactId>
+      <version>1.1.1</version>
+      <type>jar</type>
+    </dependency>
+    <dependency>
+      <groupId>org.hamcrest</groupId>
+      <artifactId>hamcrest-core</artifactId>
+      <version>1.3</version>
+      <type>jar</type>
+    </dependency>
+  </dependencies>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>de.qaware.maven</groupId>
+        <artifactId>go-offline-maven-plugin</artifactId>
+        <version>1.2.5</version>
+        <configuration>
+          <dynamicDependencies>
+            <DynamicDependency>
+              <groupId>org.apache.maven.surefire</groupId>
+              <artifactId>surefire-junit4</artifactId>
+              <version>2.20.1</version>
+              <classifier></classifier>
+              <repositoryType>PLUGIN</repositoryType>
+            </DynamicDependency>
+            <DynamicDependency>
+              <groupId>com.querydsl</groupId>
+              <artifactId>querydsl-apt</artifactId>
+              <version>4.2.1</version>
+              <classifier>jpa</classifier>
+              <repositoryType>MAIN</repositoryType>
+            </DynamicDependency>
+          </dynamicDependencies>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>

lectures/22-large numbers/code/replit.nix

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+{ pkgs }: {
+    deps = [
+        pkgs.graalvm17-ce
+        pkgs.maven
+        pkgs.replitPackages.jdt-language-server
+        pkgs.replitPackages.java-debug
+    ];
+}