View Compilation Error

0_0_20314629_18088.cpp: In function 'int main()':
0_0_20314629_18088.cpp:12:64: error: lvalue required as left operand of assignment
         if(('a'<=c[0]&&c[0]<='z')||('A'<=c[0]&&c[0]<='Z')||c[0]='_')
                                                                ^
0_0_20314629_18088.cpp:21:59: error: lvalue required as left operand of assignment
    if(('a'<=c[e]&&c[e]<='z')||('A'<=c[e]&&c[e]<='Z')||c[e]='_'||('0'<=c[e]&&c[e]<='9'))
                                                           ^
0_0_20314629_18088.cpp:27:13: error: expected ';' before '}' token
             }
             ^