Compilare: user.cpp: In function ‘int main()’: user.cpp:23:19: warning: left operand of comma operator has no effect [-Wunused-value] return ("%d", z %p); ^ user.cpp:12:10: warning: unused variable ‘s’ [-Wunused-variable] int n,p,s=0,x,y,z; ^ user.cpp:9:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma.in", "r", stdin); ^ user.cpp:10:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma.out", "w", stdout); ^ user.cpp:13:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &p); ^