Compilare: user.cpp: In function ‘int FindRoot(int)’: user.cpp:32: warning: unused variable ‘a’ user.cpp: In function ‘int main()’: user.cpp:64: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:55: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:60: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result