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Thread: adding two objects

  1. #1
    apiwowar is offline Member
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    Default adding two objects

    Thers a class called BigInt and it has a size and digit. size is the number of digits in the integer that is entered and digit is an array that holds the integer.

    I think ive got it worked out, the only thing is that when the sum goes up a tens digit it adds a leading 0. for example if i put in 99 and 1 the sum comes out as 0100 or if i put in 999 and 1 the sum comes out as 001000. How can i get rid of the leading 0's?

    This is the code

    Java Code:
     add two BigIntís 
       public BigInt plus(BigInt arg) 
    	{ 	
    		BigInt sum = new BigInt();//Create sum object
    		//declare and intialize carry
    		int carry = 0;	
    		int i, temp;
    		
    		//change size of sum
          if(this.size > arg.size)
             sum.size = this.size;
          else
             sum.size = arg.size;
    
    		//add two BigInts
    		for(i = 0; i <= sum.size - 1; i++)
    		{	
    		temp = this.digit[i] + arg.digit[i] + carry;
    			
    		System.out.println(i + " Temp is " + temp);
    			
    		sum.digit[i] = temp % 10;
    		carry = temp / 10;
    		System.out.println(i + "Carry is " + carry);
    		System.out.println("sum.digit[" + i +"] is " + sum.digit[i]);
    		
    			if(temp > 9)
    			{      
         			if(sum.digit[i] == sum.digit[sum.size-1])
    				{
             		sum.size = sum.size + 1;
                	System.out.println("The while loop works when i is " + i);
            	 }
    	
    			}		
    		}
    		
    	return sum;
     		
    	}

  2. #2
    Norm's Avatar
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    Default Re: adding two objects

    How can i get rid of the leading 0's?
    How/why are the leading 0s added? If you don't want them, don't add them.

    Can you explain your algorithm for adding two BigInt's?

  3. #3
    apiwowar is offline Member
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    Default Re: adding two objects

    i'm not sure how theyre added, i think they get added when i increase the size of sum in the if statement

  4. #4
    Norm's Avatar
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    Default Re: adding two objects

    If you don' t know where it happens, you need to debug your code to see.
    Add some printlns to print out the values of the variables that are controlling the process.

  5. #5
    Fubarable's Avatar
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