View Compilation Error

0_0_32654292_8827.cpp: In function 'int main()':
0_0_32654292_8827.cpp:29:30: error: 'a1' was not declared in this scope
   scanf("%d %d %d %d %d %d",&a1,&a2,&b1,&b2,&c1,&c2);
                              ^
0_0_32654292_8827.cpp:29:34: error: 'a2' was not declared in this scope
   scanf("%d %d %d %d %d %d",&a1,&a2,&b1,&b2,&c1,&c2);
                                  ^
0_0_32654292_8827.cpp:29:38: error: 'b1' was not declared in this scope
   scanf("%d %d %d %d %d %d",&a1,&a2,&b1,&b2,&c1,&c2);
                                      ^
0_0_32654292_8827.cpp:29:42: error: 'b2' was not declared in this scope
   scanf("%d %d %d %d %d %d",&a1,&a2,&b1,&b2,&c1,&c2);
                                          ^
0_0_32654292_8827.cpp:29:46: error: 'c1' was not declared in this scope
   scanf("%d %d %d %d %d %d",&a1,&a2,&b1,&b2,&c1,&c2);
                                              ^
0_0_32654292_8827.cpp:29:50: error: 'c2' was not declared in this scope
   scanf("%d %d %d %d %d %d",&a1,&a2,&b1,&b2,&c1,&c2);
                                                  ^