View Compilation Error

0_0_28759461_23043.cpp: In function 'double calu(double)':
0_0_28759461_23043.cpp:31:14: error: 'd' was not declared in this scope
   tmp = fabs(d - arr[i].loc),sum += (tmp * tmp * tmp * arr[i].weight);
              ^
0_0_28759461_23043.cpp:31:18: error: 'arr' was not declared in this scope
   tmp = fabs(d - arr[i].loc),sum += (tmp * tmp * tmp * arr[i].weight);
                  ^
0_0_28759461_23043.cpp: In function 'double ternary_search(double, double)':
0_0_28759461_23043.cpp:46:18: error: 'cmp' was not declared in this scope
   if (cmp(midl, n) > cmp(midr, n))
                  ^