Compilare: user.cpp: In function ‘int main()’: user.cpp:10:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i]=(t+=b[i]+c[i])%10; ^ user.cpp:10:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i]=(t+=b[i]+c[i])%10; ^ user.cpp:10:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i]=(t+=b[i]+c[i])%10; ^ user.cpp:14:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] printf("%d",(int)a[i]); ^ user.cpp:6:114: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nunta.in","r",stdin),freopen("nunta.out","w",stdout),scanf("%hd",&n),a[1]=b[1]=c[1]=a[0]=b[0]=c[0]=1; ^ user.cpp:6:114: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:6:114: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]