Compilare: user.cpp: In function ‘int main()’: user.cpp:6:6: warning: unused variable ‘n’ [-Wunused-variable] int n,t,i,exp,a,s,val,nr,f; ^ user.cpp:6:12: warning: unused variable ‘exp’ [-Wunused-variable] int n,t,i,exp,a,s,val,nr,f; ^ user.cpp:6:16: warning: unused variable ‘a’ [-Wunused-variable] int n,t,i,exp,a,s,val,nr,f; ^ user.cpp:6:18: warning: unused variable ‘s’ [-Wunused-variable] int n,t,i,exp,a,s,val,nr,f; ^ user.cpp:8:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifra.in","r",stdin); ^ user.cpp:9:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifra.out","w",stdout); ^ user.cpp:10:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&t); ^ user.cpp:34:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^