View Compilation Error

0_0_39046426_13848.cpp: In function 'int main()':
0_0_39046426_13848.cpp:11:20: error: expected primary-expression before '<' token
   11 |          else if(r=<100&&r>=90)
      |                    ^
0_0_39046426_13848.cpp:13:20: error: expected primary-expression before '<' token
   13 |          else if(r=<89&&r>=80)
      |                    ^
0_0_39046426_13848.cpp:15:19: error: expected primary-expression before '<' token
   15 |         else if(r=<79&&r>=70)
      |                   ^
0_0_39046426_13848.cpp:17:20: error: expected primary-expression before '<' token
   17 |          else if(r=<69&&r>=60)
      |                    ^
0_0_39046426_13848.cpp:19:20: error: expected primary-expression before '<' token
   19 |          else if(r=<59&&r>=0)
      |                    ^