rj.cpp: In function 'int main()': rj.cpp:63: warning: statement has no effect rj.cpp:9: warning: 'c' may be used uninitialized in this function rj.cpp:9: warning: 'v' may be used uninitialized in this function rj.cpp:9: warning: 'x' may be used uninitialized in this function rj.cpp:9: warning: 'z' may be used uninitialized in this function rj.cpp:9: warning: 'x2' may be used uninitialized in this function rj.cpp:9: warning: 'z2' may be used uninitialized in this function rj.cpp:9: warning: 'x1' may be used uninitialized in this function rj.cpp:9: warning: 'z1' may be used uninitialized in this function