include int main void printf scanf return char float double long short signed unsigned const static volatile register auto extern if else for while do switch case default break continue goto struct union enum typedef sizeof NULL true false define ifdef ifndef endif include stdio stdlib string math time bool wchar assert ctype errno fenv float inttypes limits locale setjmp signal stdarg stdbool stddef stdint tgmath threads uchar complex imaginary auto break case char const continue default do double else enum extern float for goto if inline int long register restrict return short signed sizeof static struct switch typedef union unsigned void volatile while fprintf sprintf snprintf vprintf malloc calloc realloc free strlen strcpy strncpy strcat strcmp strncmp strchr strstr strtok memset memcpy memmove atoi atol atof rand srand exit atexit system getenv puts getchar putchar fopen fclose fread fwrite fseek ftell rewind fprintf fscanf sscanf vfprintf vfscanf vscanf scanf printf sprintf snprintf vprintf vsprintf vsnprintf perror remove rename tmpfile tmpnam abs labs llabs div ldiv lldiv rand srand malloc calloc realloc free alloca bsearch qsort abs fabs ceil floor exp log pow sqrt sin cos tan asin acos atan fopen fclose feof ferror clearerr fgetc fgets fputc fputs fread fwrite fgetpos fsetpos rewind fseek ftell fprintf fscanf sprintf sscanf vfprintf vfscanf vsprintf vsscanf snprintf vsnprintf asctime clock ctime difftime gmtime localtime mktime strftime time