Compilare: user.cpp: In function ‘void read()’: user.cpp:20: warning: unused variable ‘x’ user.cpp:20: warning: unused variable ‘y’ user.cpp: In function ‘void uniform()’: user.cpp:110: warning: comparison between signed and unsigned integer expressions user.cpp:118: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:194: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result