Compilare: main.cpp: In function 'int main()': main.cpp:24:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("euclid3.in", "rt", stdin); ^ main.cpp:25:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("euclid3.out", "wt", stdout); ^ main.cpp:28:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for (scanf("%d", &T), assert( T <= 100 ); T; T--) ^ main.cpp:31:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &A, &B, &C); ^ main.cpp: In function 'int gcd(int, int, int&, int&)': main.cpp:18:22: warning: 'y0' may be used uninitialized in this function [-Wmaybe-uninitialized] y = x0 - (a / b) * y0; ~~~~~~~~^~~~ main.cpp:18:12: warning: 'x0' may be used uninitialized in this function [-Wmaybe-uninitialized] y = x0 - (a / b) * y0; ~~~^~~~~~~~~~~~~~ main.cpp:19:12: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized] return d; ^ main.cpp: In function 'int main()': main.cpp:42:42: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d\n", X * (C / D), Y * (C / D)); ~~~^~~~