View Compilation Error

0_0_36364472_30674.cpp: In function 'int main()':
0_0_36364472_30674.cpp:82:29: error: 'x1' was not declared in this scope
          scanf("%d%d%d%d", &x1, &y1, &x2, &y2);
                             ^
0_0_36364472_30674.cpp:82:34: error: 'y1' was not declared in this scope
          scanf("%d%d%d%d", &x1, &y1, &x2, &y2);
                                  ^
0_0_36364472_30674.cpp:82:39: error: 'x2' was not declared in this scope
          scanf("%d%d%d%d", &x1, &y1, &x2, &y2);
                                       ^
0_0_36364472_30674.cpp:82:44: error: 'y2' was not declared in this scope
          scanf("%d%d%d%d", &x1, &y1, &x2, &y2);
                                            ^