View Compilation Error

0_0_12308192_22539.cpp: In function `int main()':
0_0_12308192_22539.cpp:27: error: case label does not reduce to an integer constant
0_0_12308192_22539.cpp:29: error: case label does not reduce to an integer constant
0_0_12308192_22539.cpp:32: error: invalid operands of types `char' and `const char[2]' to binary `operator-'