View Compilation Error

0_0_34932371_26946.cpp: In function 'int main()':
0_0_34932371_26946.cpp:7:11: error: expected primary-expression before '=' token
   if (x < =100 & x>=90)
           ^
0_0_34932371_26946.cpp:9:22: error: invalid operands of types 'bool' and 'double' to binary 'operator&'
   else if (x <= 89 & x=>80)
                      ^
0_0_34932371_26946.cpp:9:24: error: expected primary-expression before '>' token
   else if (x <= 89 & x=>80)
                        ^