Compilare: main.cpp: In function 'void euclid_extins(int, int, int&, long long int&, long long int&)': main.cpp:19:18: warning: right operand of comma operator has no effect [-Wunused-value] x = yprim , n; ^ main.cpp:20:36: warning: right operand of comma operator has no effect [-Wunused-value] y = xprim - 1LL * yprim * q , n; ^ main.cpp: In function 'int main()': main.cpp:28:9: warning: unused variable 'tests' [-Wunused-variable] int tests, a, b, c, d; ^~~~~ main.cpp:28:19: warning: unused variable 'b' [-Wunused-variable] int tests, a, b, c, d; ^ main.cpp:28:22: warning: unused variable 'c' [-Wunused-variable] int tests, a, b, c, d; ^ main.cpp:26:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("inversmodular.in", "r", stdin); ^ main.cpp:27:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("inversmodular.out", "w", stdout); ^ main.cpp:31:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a,&n); ^