CODEWITHSUNDEEP
matlabinputcharprintf
panos deemac
panos deemac

Reputation: 101

I want to print a character in a *.txt file using matlab (the keyboard input is number)

fileID = fopen('nums.txt','w'); %opens a.txt file
s = input('s = '); %requests a number as input from the keyboard
a = char(s) %converts the number to character
fprintf(fileID,'%4.4f\n',a); %prints the character (not number) in a *.txt file

The purpose is to print a character in a *.txt file, which is written as number in advance. I type the number as input, and then I convert the number to the corresponding character.
Even though matlab returns me a = ! in the Command Window, the *.txt file include the number (typed by keyboard) 33 (unconverted to the corresponding character, as it should be)

Looking forward to your generous help.

Upvotes: 2

Views: 59

Answers (1)

AlessioX
AlessioX

Reputation: 3177

The main problem is in the fprintf(): the %f tag means a floating point number whereas a appears to be a string. You need to use %s to write a string in fprintf().

Let's say we type 33, as you suggested.
According to your code, in the Command Window we'll have a=!, which is correct, but in the .txt file we'll have 33.0000 because the fprintf() intrinsically re-converts it back to numerical (floating point, to be precise) due to the %f tag.
By replacing your fprintf() with 

fprintf(fileID,'%s\n',a); %prints the character (not number) in a *.txt file

the Command Window obviously will still display a=! but this time in the .txt file we'll have ! as well.

Upvotes: 3

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