Compilare: user.cpp: In function ‘int main()’: user.cpp:50:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1;primes[j]*primes[j] <= i && j <= c;j++){ ^ user.cpp:50:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1;primes[j]*primes[j] <= i && j <= c;j++){ ^ user.cpp:55:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(primes[j]*primes[j] > i || j > c){ ^ user.cpp:55:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(primes[j]*primes[j] > i || j > c){ ^ user.cpp:39:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("peluzasud.in", "r", stdin); ^ user.cpp:40:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("peluzasud.out", "w", stdout); ^ user.cpp:41:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld",&n, &x); ^