View Compilation Error

0_0_13811025_31420.cpp:16:16: error: stray '#' in program
 for( ;i >= 0; –i )
                ^
0_0_13811025_31420.cpp: In function 'long long int mod_exp(long long int, long long int, long long int)':
0_0_13811025_31420.cpp:16:17: error: lvalue required as unary '&' operand
 for( ;i >= 0; –i )
                 ^
0_0_13811025_31420.cpp:16:21: error: expected ')' before ';' token
 for( ;i >= 0; –i )
                     ^
0_0_13811025_31420.cpp:16:24: error: expected ';' before ')' token
 for( ;i >= 0; –i )
                        ^