Compilare: user.cpp: In function 'int main()': user.cpp:56: warning: comparison between signed and unsigned integer expressions user.cpp:58: warning: comparison between signed and unsigned integer expressions user.cpp:65: warning: use of 'll' length modifier with 'f' type character user.cpp:21: warning: unused variable 'a1' user.cpp:21: warning: unused variable 'b1' user.cpp:21: warning: unused variable 'c1' user.cpp:21: warning: unused variable 'x1' user.cpp:21: warning: unused variable 'y1' user.cpp:21: warning: unused variable 'alfa' user.cpp:20: warning: 'b' may be used uninitialized in this function user.cpp:20: warning: 'a' may be used uninitialized in this function