Compilare: main.cpp: In function 'int main()': main.cpp:15:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cmmdc.in", "r", stdin); ^ main.cpp:16:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cmmdc.out", "w", stdout); ^ main.cpp:19:27: warning: 'a' is used uninitialized in this function [-Wuninitialized] int result = cmmdc(a,b); ^ main.cpp:19:27: warning: 'b' is used uninitialized in this function [-Wuninitialized]