# $ cat sample.c
# #include <stdio.h>
#
# struct rect {
#   double x, y, height, width;
# };
#
# double frame_area(struct rect *rect) {
#   if (!rect) return 0;
#   return rect->height * rect->width;
# }
#
# int main(int argc, char**argv) {
#   struct rect frame = {5, 5, 25, 30};
#   printf("frame_area: %f\n", frame_area(&frame));
#   return 0;
# }
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