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  1.  
  2. //Product of two very large number
  3. import java.io.*;
  4. import java.util.*;
  5. import java.text.*;
  6. import java.math.*;
  7. import java.util.regex.*;
  8.  
  9.  class Solution {
  10.     public static void main(String[] args) {
  11.         Scanner scan=new Scanner(System.in);
  12.         int A=scan.nextInt();
  13.         int B=scan.nextInt();
  14.         //int N=scan.nextInt();
  15.         int [] array=new int[1000];
  16.         Arrays.fill(array,0);
  17.         int size=multiply(A,B,array);
  18.         for(int i=size-1;i>=0;i--){
  19. 			System.out.print(array[i]);
  20.         }
  21.     }
  22.     public static int multiply(int N1, int N2, int [] result){
  23.         int a=N1;
  24.         int b=N2;
  25.  
  26.         int count=0, carry=0;
  27.         int i=0;
  28.         int max=0;
  29.         if(a==0||b==0)
  30.         	return 1;
  31.         while(a>0){
  32.         	int temp1=a%10;
  33.         	a=a/10;
  34.         	i=0;
  35.         	while(b>0){
  36.         		int temp2=b%10;
  37.         		b=b/10;
  38.         		int product=result[count+i]+temp1*temp2+carry;
  39.         		result[count+i]=product%10;
  40.         		carry=product/10;
  41.         		i++;
  42.         		//System.out.println("ii="+i);
  43.         	}
  44.         	while(carry>0){
  45.         		result[count+i]=carry%10;
  46.         		carry=carry/10;
  47.         		i++;
  48.         		//System.out.println("iiii="+i);
  49.         	}
  50.         	count++;
  51.         	b=N2;
  52.         } 
  53.         //System.out.println("i="+i);
  54.  
  55.         return i+count-1;
  56.     }
  57. }
Success #stdin #stdout 0.14s 321088KB
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99990 9999
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https://ideone.com/UbG9dW
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
secret

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