Find the mistake in the following C code:

Question

What is the mistake in the following code ? 
```c
int main() 
{
    unsigned char speed= -255;
    printf("the motor has a rotational speed of %d km/h", speed);
    return 0;
}
```

Accepted Answer

variable speed is a signed char

Answer

the statement "return 0;"

Answer

the type char contains integer from -127 to 127

Answer

the type unsigned char is not defined for integer upper than 254

Question from the Language C - Fundamentals test

Find the mistake in the following C code: