View Compilation Error

0_0_37615338_23869.cpp: In function 'int main()':
0_0_37615338_23869.cpp:31:65: error: lvalue required as left operand of assignment
     }else if(q[len-1]='o'||q[len-1]='s'||(q[len-2]='c'&&q[len-1]='h')||(q[len-2]='s'&&q[len-1]='h')||q[len-1]='x'){
                                                                 ^
0_0_37615338_23869.cpp:31:95: error: lvalue required as left operand of assignment
     }else if(q[len-1]='o'||q[len-1]='s'||(q[len-2]='c'&&q[len-1]='h')||(q[len-2]='s'&&q[len-1]='h')||q[len-1]='x'){
                                                                                               ^