Compilare: user.cpp: In function ‘void desc(int)’: user.cpp:10:9: warning: variable ‘orig’ set but not used [-Wunused-but-set-variable] int orig, d, cnt, lim; ^ user.cpp: In function ‘int main()’: user.cpp:40:18: warning: NULL used in arithmetic [-Wpointer-arith] while(s[i] != NULL) { ^ user.cpp:32:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("exp.in", "r", stdin); ^ user.cpp:33:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("exp.out", "w", stdout); ^ user.cpp:36:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &n, &m); ^ user.cpp:37:11: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/cc0uchu4.o: In function `main': user.cpp:(.text.startup+0x71): warning: the `gets' function is dangerous and should not be used.