How can I write a program to make someone input a 6 digit number and show a result of the summation of the 6 digits?

Anybody know the functions I need?

[Thorsten]

Is this homework? What have you done so far, and where did you got stuck?

Answer 1

[Stephen23]

Try this:

sum(input('Enter a six digit number:','s')-'0')

[Sudharsana Iyengar]

I tried this and it works.

Answer 2

[Sudharsana Iyengar]

you can try this simple program by using fix. This writes a six digit number as sum of ones hundreds thousands etc.

This code can be made better by using recursion.

Here is the Program

    n = input('Enter a six digit number:');
z=fix(n/100000);
y=fix(n-z*100000);
w=fix(y/10000);
y2=fix(y-w*10000);
w2=fix(y2/1000);
y3=fix(y2-w2*1000);
w3=fix(y3/100);
y4=fix(y3-w3*100);
w4=fix(y4/10);
y5=fix(y4-w4*10);
w5=fix(y5);
z*100000
w*10000
w2*1000
w3*100
w4*10
w5*1

z,w,w2,w3,w4,and w5 store the values you can save them in an array or use it for any other manipulation.

Answer 3

[Thorsten]

Convert the number to a string, and then convert each character of the string to the corresponding value (using arrayfun to work on each element of the string), and sum the resulting values:

 num = 123456; % sample number
 sumofdigits = sum(arrayfun(@(x) double(x)- double('0'), int2str(num)));

[Sudharsana Iyengar]

Dear Thorsten

Can you elaborate on this code a little bit more if you dont mind. I am quite new to matlab, hence would like to learn. thanks.

[Andrei Bobrov]

just

num = 123456;
sumofdigits = sum(int2str(num) - '0');

[Thorsten]

Dear Sudharsana,

The idea to convert the number to a string. In a string, each digit has a numerical value depending on the encoding, usually ASCII. For example, the string '123456' is represented as [49 50 51 52 53 54]. The nice thing in Matlab is that you can treat this string just as an array of numbers. If you now subtract the value of the character '0', namely 48, from your array, you get an array of numbers [ 1 2 3 4 5 6]. Use sum to sum all values, et Voilá! Please note that Steven and Andrei proposed shorter and more elegant ways to do this.