signed character output

[Shubhangi24]

can anyone please answer me
why the output of following code is -1?

int main()
{
  signed char ch=255;
  printf("%d",ch);

 return 0;
}

[r035198x]

What do you think is the reason? hint: What is the maximum for unsigned char on your compiler and what does your compiler documentation say will happen when you exceed it?