Compilare: user.cpp: In function ‘int main()’: user.cpp:10:10: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] bool ok, swap; ^ user.cpp:10:14: warning: variable ‘swap’ set but not used [-Wunused-but-set-variable] bool ok, swap; ^ user.cpp:11:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gauss.in","r",stdin); ^ user.cpp:12:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gauss.out","w",stdout); ^ user.cpp:13:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:15:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (j=1; j<=m+1; j++) scanf("%f",&a[i][j]); ^