Question

Matlab:

Write a program that calculates and stores in a vector the results of the sum 9 + 99 + 999 + 9999 + .... for any number of components.

Answer 1

PROGRAM FOR GIVEN QUESTION:

%matlab program to find the sum of
%the series 9+99+999+9999+....
n=input('enter a number upto which you need sum:');
sum=0;
vector=[];
j=9;
for i=1:n
    sum = sum + j;
    vector=[vector j];
% Appending a 9 at the end
    j = (j * 10) + 9;
end
disp(vector)
fprintf('sum of %d numbers is:%d\n',n,sum)

OUTPUT:

>> HomeworkLib
enter a number upto which you need sum:4
           9          99         999        9999

sum of 4 numbers is:11106