Compilare: user.cpp: In function ‘int CoefX(char*)’: user.cpp:19:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<strlen(p); i++) ^ user.cpp: In function ‘int CoefC(char*)’: user.cpp:59:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<strlen(p); i++) ^ user.cpp:61:45: warning: NULL used in arithmetic [-Wpointer-arith] if (p[i]=='+' || p[i]=='-' || p[i]==NULL) ^ user.cpp: In function ‘void Citire(int&)’: user.cpp:10:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ecuatii2.in","r",stdin); ^ user.cpp:11:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d\n", &n); ^ user.cpp: In function ‘void Ecuatii(int, char*)’: user.cpp:115:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ecuatii2.out","w",stdout); ^ user.cpp:119:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets (c,257,stdin); ^