Compilare: user.cpp: In function ‘void Citire()’: user.cpp:10:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri2.in", "r", stdin) ; ^ user.cpp:11:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &L, &C) ; ^ user.cpp:12:64: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1 ; i<=L ; i++) for (j=1 ; j<=C ; j++) {scanf("%d", &x); a[i][j] = -x ;} ^ user.cpp: In function ‘void Afisare()’: user.cpp:83:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri2.out", "w", stdout) ; ^