Compilare: user.cpp: In function ‘void getCoef(int&, int&, char*)’: user.cpp:34:21: warning: NULL used in arithmetic [-Wpointer-arith] while(str[i] != NULL) { ^ user.cpp: In function ‘int main()’: user.cpp:67:15: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] eq[i] = NULL; ^ user.cpp:54:39: 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:55:41: 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:58:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &nTests); ^ user.cpp:62:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", eq); ^