View Compilation Error

0_0_15960321_813.cpp: In function 'int main()':
0_0_15960321_813.cpp:8:17: error: expected initializer before 'a'
 unsigned _int64 a[42];
                 ^
0_0_15960321_813.cpp:9:17: error: expected initializer before 'b'
 unsigned _int64 b[42];
                 ^
0_0_15960321_813.cpp:10:1: error: 'a' was not declared in this scope
 a[2]=3;
 ^
0_0_15960321_813.cpp:11:1: error: 'b' was not declared in this scope
 b[2]=6;
 ^