View Compilation Error

0_0_32909064_20037.cpp: In function 'int main()':
0_0_32909064_20037.cpp:38:31: error: 'xr' was not declared in this scope
         scanf("%d %d %d %d", &xr, &xi, &br, &bi);
                               ^
0_0_32909064_20037.cpp:38:36: error: 'xi' was not declared in this scope
         scanf("%d %d %d %d", &xr, &xi, &br, &bi);
                                    ^