How do I add leading zero to integer string in MATLAB 7.8 (R2009a)?

Question

MathWorks Support Team 2009-6-27

评论： Walter Roberson 2017-3-16

I want to form a string that has some text, and a number formed by using an integer.

For example, if the integer is 5, I want to form a string -

'SomeText05'. If the integer is 15, I want to form 'SomeText15'.

Strcat('SomeText', int2str(15)) gives me SomeText15, but

strcat('SomeText', int2str(5)) gives me SomeText5. I want SomeText05.

I do not know what format string I should use to get the leading zero before 5.

Answer 1

You can use SPRINTF function with the following 'flag' and 'fieldwidth':

sprintf('%02d',5)

To append this formatted string to a fixed string, you can do something as:

strcat('SomeText', sprintf('%02d',5))
strcat('SomeText', sprintf('%02d',15))

To get more information on SPRINTF and different options that you have along with it, please refer to the following documentation page:

<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/sprintf.html>

Walter Roberson 2017-3-16

With a fixed string, you would probably use something like

sprintf('SomeText%02d', 5)