View Compilation Error

0_0_38703379_7627.cpp: In function 'int main()':
0_0_38703379_7627.cpp:9:12: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
    9 |         at="1";
      |            ^~~
      |            |
      |            const char*
0_0_38703379_7627.cpp:10:12: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
   10 |         bt="0";
      |            ^~~
      |            |
      |            const char*