I need help with c programming, i need to fill in the code and I got these (need help with question 4), I run the grader and I only got question 1 right.

grader code:
gcc worksheet.c;
./a.out 0;
if [ $? -eq 0 ]
then
echo 'Question 0 Correct';
else
echo $? 'is not correct for question 0';
fi
./a.out 1;
if [ $? -gt 1 ]
then
echo 'Question 1 Correct';
else
echo $? 'is not correct for question 1';
fi
./a.out 2 9;
if [ $? -eq 9 ]
then
./a.out 2 5;
if [ $? -eq 5 ]
then
echo 'Question 2 Correct';
else
echo 'Not Correct for Question 2';
fi
else
echo 'Not Correct for Question 2';
fi
./a.out 3 9;
if [ $? -eq 0 ]
then
./a.out 3 5;
if [ $? -eq 1 ]
then
echo 'Question 3 Correct';
else
echo 'Not Correct for Question 3';
fi
else
echo 'Not Correct for Question 3';
fi
./a.out 4 1;
if [ $? -eq 5 ]
then
./a.out 4 2;
if [ $? -eq 25 ]
then
echo 'Question 4 Correct';
else
echo 'Not Correct for Question 4';
fi
else
echo 'Not Correct for Question 4';
fi
rm a.out;

homework code:
//DO NOT ALTER THE MAIN FUNCTION, THIS IS FOR GRADING.
int main(int argc, char * argv[]){
switch(argv[1][0]){
case 0:
return question0();
case 1:
return question1();
case 2:
return question2(argv[2][0]-48);
case 3:
return question3(argv[2][0]-48);
case 4:
return question4(argv[2][0]-48);
default:
return 1;
}
}

int question0(){
//return a successful exit status.
return 0;
}

int question1(){
//return your favorite positive number greater than one.
return 2;
}

int question2(int arg){
//return your input.
return arg;
}

int question3(int arg){
//if arg is greater than 5 return 0, otherwise return 1.
if (arg > 5){
return 0;}
else {
return 1;
}
}

int question4(int arg){
//return 5 multiplied by itself arg-1 times.
for (arg = 0; arg < 1; arg++){
5 * arg;
}
}

To troubleshoot the issue with question 4, you can start by looking at the code for the "question4" function in the homework code. It seems that the loop condition in the for loop is incorrect. Instead of "arg < 1", it should be "arg < arg-1".

Here is the corrected code for the "question4" function:

```c
int question4(int arg){
// return 5 multiplied by itself arg-1 times
int result = 1;
for (int i = 0; i < arg-1; i++){
result *= 5;
}
return result;
}
```

You can replace the existing code for question 4 with this corrected code. Make sure to save the changes and recompile the program using the following commands:

```bash
gcc worksheet.c;
```

Then, run the grader again:

```bash
./a.out 4 1;
```

If the output is "Question 4 Correct", then the issue has been resolved. Otherwise, you can review the code and make any further corrections if needed.

In the given homework code, the implementation of the `question4` function is incorrect. It is missing a return statement. To fix it, you need to update the `question4` function as shown below:

```c
int question4(int arg){
//return 5 multiplied by itself arg-1 times.
int result = 1;
for (int i = 0; i < arg - 1; i++){
result *= 5;
}
return result;
}
```

This updated code uses a variable `result` to store the multiplication result and iterates `arg - 1` times to perform the multiplication. Finally, it returns the `result`.

After making this change, you can run the grader code again to check if question 4 is correct.