MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

### Discover what MATLAB® can do for your career.

Opportunities for recent engineering grads.

# Solution 184400

Submitted on 2 Jan 2013 by James

Correct

28Size
Leading solution size is 24.
`This solution is locked. To view this solution, you need to provide a solution of the same size or smaller.`

### Test Suite

Test
Code Input and Output
1
Pass

```!cp diff_digits.m safe
!rm *.*
!mv safe diff_digits.m
% Clean user's function from some known jailbreaking mechanisms
fid = fopen('diff_digits.m');
st = regexprep(char(fread(fid)'), '!', 'error(''No shell commands!''); %');
st = regexprep(st, 'feval', 'error(''No fancy functions!''); %');
st = regexprep(st, 'str2func', 'error(''No fancy functions!''); %');
st = regexprep(st, 'regex', 'error(''No fancy functions!''); %');
st = regexprep(st, 'system', 'error(''No shell commands!''); %');
st = regexprep(st, 'dos', 'error(''No shell commands!''); %');
st = regexprep(st, 'unix', 'error(''No shell commands!''); %');
st = regexprep(st, 'perl', 'error(''No external languages commands!''); %');
st = regexprep(st, 'java', 'error(''No external languages commands!''); %');
st = regexprep(st, 'assert', 'error(''No overwriting!''); %');
fclose(fid)
fid = fopen('diff_digits.m' , 'w');
fwrite(fid,st);
fclose(fid)
```
```ans =
0
ans =
0
```
2
Pass

```%%
start=1000; finish=1023; y_correct = 1;
assert(isequal(diff_digits(start,finish),y_correct))
```

3
Pass

```%%
start=1000; finish=9999; y_correct = 4536;
assert(isequal(diff_digits(start,finish),y_correct))
```

4
Pass

```%%
start=1234; finish=5678; y_correct = 2273;
assert(isequal(diff_digits(start,finish),y_correct))
```

5
Pass

```%%
assert(isequal(diff_digits(4321,6789),1210))
```

6
Pass

```%%
assert(isequal(diff_digits(1988,2012),0))
```