This body of code works fine. I am trying to make some change to make it more efficient.

Don't worry about what is misssing. It's the C.

Make any modification as you please, except don't change any name Like the functions and variables.

When take the factorial of 2000 it takes 55 msec. I want it to take less than that.

static void calcfactorial(unsigned int n) { unsigned int carry, i, j; len = factorial[0] = 1; for (i = 1;i0; i--) printf("%ld", factorial[i-1]); printf(" "); }