• Post Reply Bookmark Topic Watch Topic
  • New Topic

performing long multiplications using string  RSS feed

 
Farhan Karim
Greenhorn
Posts: 5
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi,
I got this question on the entrance exam for MCS ,can someone tell me how it's solved or provide code for it please , I have a feeling it will be helpful for the next exam.Thanks

Write a java class that multiplies the long number. The class will receive multiplicand and multiplier as string inputs, convert string values to their digit represent and show the partial products and product as shown in the example below:

adsdasd.png
[Thumbnail for adsdasd.png]
 
Mike. J. Thompson
Bartender
Posts: 689
17
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Welcome to the ranch Farhan.

Farhan Karim wrote:can someone tell me how it's solved or provide code for it please



That isn't how it works here. How about you provide your attempt at a solution and ask us specific questions about things you don't understand, and we'll help you from there.

Start by writing down the steps you would take when solving that problem manually.
 
Stephan van Hulst
Saloon Keeper
Posts: 7817
142
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Fahran, welcome to CodeRanch!

We don't hand out complete solutions here. Instead, we can help you solve the problem by yourself.

Write a class that has a method that splits the multiplier into single digits. Then, you can multiply the multiplicand with a multiplier digit times 10 to the power of the digit's position to get the partial product.
 
Campbell Ritchie
Marshal
Posts: 55772
163
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Welcome again

Hope it's not too late, but in addition to the helpful advice you have already received:-
Write down carefully on paper how you do “long” multiplication by hand. Things like, “put the rightmost digit under the digit being multiplied and pack with 0s,” are what you want. When you have such an explanation on paper, it is much easier to turn into code.
 
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!