% Function Name: IDfinder % % Inputs (2): - (char) file name % - (double) ID num

Question

% Function Name: IDfinder

%

% Inputs (2): - (char) file name

% - (double) ID number

%

% Outputs (2): - (logical) A logical true or false if the name ID number in the file.

% - (double or char) The line on which the ID number occurs or if the skipper is found

%

% Function Description:

% Write a function, IDfinder, that scans a company's attendance database

% (text file) for ID numbers of people they think are skipping work.

% The file will have one ID number per line. The ID numbers on the file are unique.

% If the ID number exists in the file, output a logical true and the line on which it occurs.

% If the ID number does not exist, output a logical false and instead of the line number,

% output 'Found a Skipper!'.

%

% Test Case:

% ID.txt contains the following and is in the current folder:

% -------------------------------------(lines not part of the file)

% 16232

% 29564

% 35663

% 46552

% 58654

% 66665

%-------------------------------------(lines not part of the file)

%

% [log lineNum] = IDfinder('ID.txt','35663');

% -->log = true

% -->lineNum = 3

%

% [log lineNum] = IDfinder('ID.txt','11111');

% -->log = false

% -->lineNum = 'Found a Skipper!'

Explanation / Answer

function [log lineNum] = IDfinder(inp,num)

if isstr(num)

num=str2num(num);

end

log = false;

fid = fopen(inp);

tline = fgetl(fid);

k=1;

while ischar(tline)

tline=str2double(tline);

if tline == num

log=true;

lineNum =k;

end

tline = fgetl(fid);

k=k+1;

end

fclose(fid);

if log == false

lineNum= 'Found a Skipper!';

end

end

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