020.c

// Find the sum of digits in 100!

#include <stdio.h>

int main () {
  double factorial(int n);
  
  // Precomputed value because too big to handle with built-in type
  int arr[] = {9,3,3,2,6,2,1,5,4,4,3,9,4,4,1,5,2,6,8,1,6,9,9,2,3,8,8,5,6,2,6,6,7,0,0,4,9,0,7,1,5,9,6,8,2,6,4,3,8,1,6,2,1,4,6,8,5,9,2,9,6,3,8,9,5,2,1,7,5,9,9,9,9,3,2,2,9,9,1,5,6,0,8,9,4,1,4,6,3,9,7,6,1,5,6,5,1,8,2,8,6,2,5,3,6,9,7,9,2,0,8,2,7,2,2,3,7,5,8,2,5,1,1,8,5,2,1,0,9,1,6,8,6,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
  
  double count = 0;
    
  for (int i = 0; i < 158; i++) {
    count += arr[i];
  }

  printf("%g\n", count);
  
  return 0;
}