gistfile1.c

  #include <stdio.h>

  unsigned int fib(unsigned int n) {
    unsigned int a = 1, b = 1;
    unsigned int tmp;
    while (--n >= 0) {
      tmp = a;
      a += b;
      b = tmp;
    }
    return a;
  }

  main() {
    printf("%u", fib(10));
  }