View Compilation Error

0_0_16981343_31673.cpp:36:12: error: stray '#' in program
    while(m–){   
            ^
0_0_16981343_31673.cpp:39:30: error: stray '#' in program
     cout<<"Gear ratio "<<x<<’:'<<y;
                              ^
0_0_16981343_31673.cpp:39:5: error: missing terminating ' character
     cout<<"Gear ratio "<<x<<’:'<<y;
     ^
0_0_16981343_31673.cpp: In function 'int main()':
0_0_16981343_31673.cpp:30:32: error: 'memset' was not declared in this scope
    memset(mark, 0, sizeof(mark));
                                ^
0_0_16981343_31673.cpp:36:17: error: expected ')' before ';' token
    while(m–){   
                 ^
0_0_16981343_31673.cpp:36:18: error: expected primary-expression before ')' token
    while(m–){   
                  ^