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:11:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&L,&C) ; ^ user.cpp:12:53: 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:61:46: 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) ; ^