adventofcode/2015/day02/day02.c

#include <stdio.h>

int getBoxSidesArea(int l, int w, int h) {
  return (2*l*w + 2*w*h + 2*h*l);
}

int getSmallestSideArea(int l, int w, int h) {
  int smallest = (l * w);
  if((l * h) < smallest) {
    smallest = (l * h);
  }
  if((w * h) < smallest) {
    smallest = (w * h);
  }
  return smallest;
}

int getSmallestPerimeter(int l, int w, int h) {
  int use1, use2;
  if(l < w || l < h) {
    use1 = l;
    if(w < h) {
      use2 = w;
    } else {
      use2 = h;
    }
  } else {
    use1 = w;
    use2 = h;
  }
  return (use1 * 2) + (use2 * 2);
}

int getBoxArea(int l, int w, int h) {
  return l * w * h;
}

void part1() {
  printf("Part 1\n");
  int l, w, h, result = 0;
  while(scanf("%dx%dx%d", &l, &w, &h) > 0) {
    result += getBoxSidesArea(l, w, h) + getSmallestSideArea(l, w, h);
  }
  printf("Square Feet Needed: %d\n", result);
}

void part2() {
  printf("Part 2\n");
  int l, w, h, result = 0;
  while(scanf("%dx%dx%d", &l, &w, &h) > 0) {
    result += getSmallestPerimeter(l, w, h) + getBoxArea(l, w, h);
  }
  printf("Ribbon Length Needed: %d\n", result);
}

int main(int argc, char **argv) {
  int doPart = 1;
  if(argc > 1) { doPart = argv[1][0] - '0'; }
  if(doPart == 1) {
    part1();
  } else {
    part2();
  }
  return 0;
}