View Compilation Error

0_0_22906584_14054.cpp: In function 'int main()':
0_0_22906584_14054.cpp:11:39: error: 'a' was not declared in this scope
         scanf("%I64d%I64d%I64d%I64d",&a,&b,&c,&d);
                                       ^
0_0_22906584_14054.cpp:11:42: error: 'b' was not declared in this scope
         scanf("%I64d%I64d%I64d%I64d",&a,&b,&c,&d);
                                          ^
0_0_22906584_14054.cpp:11:45: error: 'c' was not declared in this scope
         scanf("%I64d%I64d%I64d%I64d",&a,&b,&c,&d);
                                             ^
0_0_22906584_14054.cpp:11:48: error: 'd' was not declared in this scope
         scanf("%I64d%I64d%I64d%I64d",&a,&b,&c,&d);
                                                ^