How to write a script for the following?

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1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1234 x 8 + 4 = 9876
12345 x 8 + 5 = 98765
123456 x 8 + 6 = 987654
1234567 x 8 + 7 = 9876543
12345678 x 8 + 8 = 98765432
123456789 x 8 + 9 = 987654321
The script should iterate from 1 to 9 to produce the expressions on the left, then perform the specified operation to get the results on the right, and finally print exactly in the format above
Thank you!

Accepted Answer

Stephen23
Stephen23 on 4 Nov 2017
>> for k=1:9, n=sscanf(sprintf('%d',1:k),'%d'); fprintf('%d x 8 + %d = %d\n',n,k,n*8+k); end
1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1234 x 8 + 4 = 9876
12345 x 8 + 5 = 98765
123456 x 8 + 6 = 987654
1234567 x 8 + 7 = 9876543
12345678 x 8 + 8 = 98765432
123456789 x 8 + 9 = 987654321
>>
  5 Comments
Stephen23
Stephen23 on 4 Nov 2017
Edited: Stephen23 on 4 Nov 2017
@Zhuoying Lin: of course, there are always other ways of doing things. You could calculate n without any strings at all, which might even be more efficient:
n = sum((k:-1:1).*10.^(0:k-1));
e.g.
>> for k=1:9, n=sum((k:-1:1).*10.^(0:k-1)); fprintf('%d x 8 + %d = %d\n',n,k,n*8+k); end
1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1234 x 8 + 4 = 9876
12345 x 8 + 5 = 98765
123456 x 8 + 6 = 987654
1234567 x 8 + 7 = 9876543
12345678 x 8 + 8 = 98765432
123456789 x 8 + 9 = 987654321

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More Answers (1)

Walter Roberson
Walter Roberson on 4 Nov 2017
for loop and use fprintf()
  1 Comment
Zhuoying Lin
Zhuoying Lin on 4 Nov 2017
Yes I know what it is tested on but I have no idea how to compose it

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