Compilare: user.cpp: In function ‘int e_prim(long int)’: user.cpp:27:24: warning: left operand of comma operator has no effect [-Wunused-value] for (long i=1;i<=pr[0],pr[i]*pr[i]<=x;i++){ ^ user.cpp:30:24: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if (x=1) ^ user.cpp: In function ‘int main()’: user.cpp:59:22: warning: left operand of comma operator has no effect [-Wunused-value] for(i=1;i<=pr[0],pr[i]*pr[i]*pr[i] <= x;i++) { ^ user.cpp:42:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ubercool.in","r",stdin); ^ user.cpp:43:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ubercool.out","w",stdout); ^ user.cpp:47:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld\n",&t); ^ user.cpp:49:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld\n",&x); ^